mu

Bumps [i18n](https://github.com/ruby-i18n/i18n) from 0.7.0 to 1.10.0.
- [Release notes](https://github.com/ruby-i18n/i18n/releases)
- [Changelog](https://github.com/ruby-i18n/i18n/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ruby-i18n/i18n/compare/v0.7.0...v1.10.0)

---
updated-dependencies:
- dependency-name: i18n
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

.gitignore

@@ -0,0 +1 @@
+**/rust/target

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "2022/bqn/lib"]
+	path = 2022/bqn/lib
+	url = https://github.com/mlochbaum/bqn-libs.git

2015/ruby/Gemfile.lock

@@ -1,17 +1,17 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (4.2.5)
+    activesupport (7.0.3)
-      i18n (~> 0.7)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
-      json (~> 1.7, >= 1.7.7)
+      i18n (>= 1.6, < 2)
-      minitest (~> 5.1)
+      minitest (>= 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
+      tzinfo (~> 2.0)
-      tzinfo (~> 1.1)
     awesome_print (1.6.1)
     coderay (1.1.0)
     colorize (0.7.7)
-    i18n (0.7.0)
+    concurrent-ruby (1.1.10)
-    json (1.8.3)
+    i18n (1.10.0)
+      concurrent-ruby (~> 1.0)
     letters (0.4.1)
       activesupport
       awesome_print
@@ -24,9 +24,8 @@ GEM
       method_source (~> 0.8.1)
       slop (~> 3.4)
     slop (3.6.0)
-    thread_safe (0.3.5)
+    tzinfo (2.0.4)
-    tzinfo (1.2.2)
+      concurrent-ruby (~> 1.0)
-      thread_safe (~> 0.1)
     xml-simple (1.1.5)
 
 PLATFORMS

2015/rust/Cargo.lock

@@ -0,0 +1,145 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "advapi32-sys"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "307c92332867e586720c0222ee9d890bbe8431711efed8a1b06bc5b40fc66bd7"
+dependencies = [
+ "winapi",
+ "winapi-build",
+]
+
+[[package]]
+name = "advent_of_code"
+version = "0.1.0"
+dependencies = [
+ "permutohedron",
+ "regex",
+ "rust-crypto",
+]
+
+[[package]]
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+]
+
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+]
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+
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+ "advapi32-sys",
+ "libc 0.2.4",
+ "winapi",
+]
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+[[package]]
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+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
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+[[package]]
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+
+[[package]]
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+checksum = "b8672a8eb8db93d0938972e391159ba66912b415285ee5cf0ebe732df9e53b70"
+dependencies = [
+ "gcc",
+ "libc 0.1.12",
+ "rand",
+ "rustc-serialize",
+ "time",
+]
+
+[[package]]
+name = "rustc-serialize"
+version = "0.3.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a48546a64cae47d06885e9bccadb99d0547d877a94c5167fa451ea33a484456"
+
+[[package]]
+name = "time"
+version = "0.1.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8c4aeaa1c95974f5763c3a5ac0db95a19793589bcea5d22e161b5587e3aad029"
+dependencies = [
+ "kernel32-sys",
+ "libc 0.2.4",
+ "winapi",
+]
+
+[[package]]
+name = "winapi"
+version = "0.2.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc3583688b861fcd83c2823d37cf2cd2446c233dd7ba3f97884d1a7302817537"
+
+[[package]]
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2015/rust/Cargo.toml

@@ -4,6 +4,6 @@ version = "0.1.0"
 authors = ["Alpha Chen <alpha.chen@gmail.com>"]
 
 [dependencies]
-regex = "0.1"
+regex = "1.5"
 rust-crypto = "^0.2"
 permutohedron = "0.2"

2016/input/day_01.txt

@@ -0,0 +1 @@
+R4, R3, L3, L2, L1, R1, L1, R2, R3, L5, L5, R4, L4, R2, R4, L3, R3, L3, R3, R4, R2, L1, R2, L3, L2, L1, R3, R5, L1, L4, R2, L4, R3, R1, R2, L5, R2, L189, R5, L5, R52, R3, L1, R4, R5, R1, R4, L1, L3, R2, L2, L3, R4, R3, L2, L5, R4, R5, L2, R2, L1, L3, R3, L4, R4, R5, L1, L1, R3, L5, L2, R76, R2, R2, L1, L3, R189, L3, L4, L1, L3, R5, R4, L1, R1, L1, L1, R2, L4, R2, L5, L5, L5, R2, L4, L5, R4, R4, R5, L5, R3, L1, L3, L1, L1, L3, L4, R5, L3, R5, R3, R3, L5, L5, R3, R4, L3, R3, R1, R3, R2, R2, L1, R1, L3, L3, L3, L1, R2, L1, R4, R4, L1, L1, R3, R3, R4, R1, L5, L2, R2, R3, R2, L3, R4, L5, R1, R4, R5, R4, L4, R1, L3, R1, R3, L2, L3, R1, L2, R3, L3, L1, L3, R4, L4, L5, R3, R5, R4, R1, L2, R3, R5, L5, L4, L1, L1

2016/input/day_02.txt

@@ -0,0 +1,5 @@
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2016/input/day_06.txt

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+dnyytrcx

2016/input/day_08.txt

@@ -0,0 +1,173 @@
+rect 1x1
+rotate row y=0 by 20
+rect 1x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 3
+rect 2x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 3
+rect 2x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 4
+rect 2x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 3
+rect 2x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 5
+rect 1x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 6
+rect 5x1
+rotate row y=0 by 2
+rect 1x3
+rotate row y=2 by 8
+rotate row y=0 by 8
+rotate column x=0 by 1
+rect 7x1
+rotate row y=2 by 24
+rotate row y=0 by 20
+rotate column x=5 by 1
+rotate column x=4 by 2
+rotate column x=2 by 2
+rotate column x=0 by 1
+rect 7x1
+rotate column x=34 by 2
+rotate column x=22 by 1
+rotate column x=15 by 1
+rotate row y=2 by 18
+rotate row y=0 by 12
+rotate column x=8 by 2
+rotate column x=7 by 1
+rotate column x=5 by 2
+rotate column x=2 by 1
+rotate column x=0 by 1
+rect 9x1
+rotate row y=3 by 28
+rotate row y=1 by 28
+rotate row y=0 by 20
+rotate column x=18 by 1
+rotate column x=15 by 1
+rotate column x=14 by 1
+rotate column x=13 by 1
+rotate column x=12 by 2
+rotate column x=10 by 3
+rotate column x=8 by 1
+rotate column x=7 by 2
+rotate column x=6 by 1
+rotate column x=5 by 1
+rotate column x=3 by 1
+rotate column x=2 by 2
+rotate column x=0 by 1
+rect 19x1
+rotate column x=34 by 2
+rotate column x=24 by 1
+rotate column x=23 by 1
+rotate column x=14 by 1
+rotate column x=9 by 2
+rotate column x=4 by 2
+rotate row y=3 by 5
+rotate row y=2 by 3
+rotate row y=1 by 7
+rotate row y=0 by 5
+rotate column x=0 by 2
+rect 3x2
+rotate column x=16 by 2
+rotate row y=3 by 27
+rotate row y=2 by 5
+rotate row y=0 by 20
+rotate column x=8 by 2
+rotate column x=7 by 1
+rotate column x=5 by 1
+rotate column x=3 by 3
+rotate column x=2 by 1
+rotate column x=1 by 2
+rotate column x=0 by 1
+rect 9x1
+rotate row y=4 by 42
+rotate row y=3 by 40
+rotate row y=1 by 30
+rotate row y=0 by 40
+rotate column x=37 by 2
+rotate column x=36 by 3
+rotate column x=35 by 1
+rotate column x=33 by 1
+rotate column x=32 by 1
+rotate column x=31 by 3
+rotate column x=30 by 1
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+rotate column x=25 by 1
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+rotate column x=22 by 1
+rotate column x=21 by 1
+rotate column x=20 by 1
+rotate column x=18 by 1
+rotate column x=17 by 1
+rotate column x=16 by 3
+rotate column x=15 by 1
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+rotate column x=12 by 1
+rotate column x=11 by 2
+rotate column x=10 by 1
+rotate column x=8 by 1
+rotate column x=7 by 2
+rotate column x=5 by 1
+rotate column x=3 by 3
+rotate column x=2 by 1
+rotate column x=1 by 1
+rotate column x=0 by 1
+rect 39x1
+rotate column x=44 by 2
+rotate column x=42 by 2
+rotate column x=35 by 5
+rotate column x=34 by 2
+rotate column x=32 by 2
+rotate column x=29 by 2
+rotate column x=25 by 5
+rotate column x=24 by 2
+rotate column x=19 by 2
+rotate column x=15 by 4
+rotate column x=14 by 2
+rotate column x=12 by 3
+rotate column x=9 by 2
+rotate column x=5 by 5
+rotate column x=4 by 2
+rotate row y=5 by 5
+rotate row y=4 by 38
+rotate row y=3 by 10
+rotate row y=2 by 46
+rotate row y=1 by 10
+rotate column x=48 by 4
+rotate column x=47 by 3
+rotate column x=46 by 3
+rotate column x=45 by 1
+rotate column x=43 by 1
+rotate column x=37 by 5
+rotate column x=36 by 5
+rotate column x=35 by 4
+rotate column x=33 by 1
+rotate column x=32 by 5
+rotate column x=31 by 5
+rotate column x=28 by 5
+rotate column x=27 by 5
+rotate column x=26 by 3
+rotate column x=25 by 4
+rotate column x=23 by 1
+rotate column x=17 by 5
+rotate column x=16 by 5
+rotate column x=13 by 1
+rotate column x=12 by 5
+rotate column x=11 by 5
+rotate column x=3 by 1
+rotate column x=0 by 1

2016/input/day_11.txt

@@ -0,0 +1,4 @@
+The first floor contains a promethium generator and a promethium-compatible microchip.
+The second floor contains a cobalt generator, a curium generator, a ruthenium generator, and a plutonium generator.
+The third floor contains a cobalt-compatible microchip, a curium-compatible microchip, a ruthenium-compatible microchip, and a plutonium-compatible microchip.
+The fourth floor contains nothing relevant.

2016/input/day_12.txt

@@ -0,0 +1,23 @@
+cpy 1 a
+cpy 1 b
+cpy 26 d
+jnz c 2
+jnz 1 5
+cpy 7 c
+inc d
+dec c
+jnz c -2
+cpy a c
+inc a
+dec b
+jnz b -2
+cpy c b
+dec d
+jnz d -6
+cpy 16 c
+cpy 17 d
+inc a
+dec d
+jnz d -2
+dec c
+jnz c -5

2016/input/day_21.txt

@@ -0,0 +1,100 @@
+move position 0 to position 3
+rotate right 0 steps
+rotate right 1 step
+move position 1 to position 5
+swap letter h with letter b
+reverse positions 1 through 3
+swap letter a with letter g
+swap letter b with letter h
+rotate based on position of letter c
+swap letter d with letter c
+rotate based on position of letter c
+swap position 6 with position 5
+rotate right 7 steps
+swap letter b with letter h
+move position 4 to position 3
+swap position 1 with position 0
+swap position 7 with position 5
+move position 7 to position 1
+swap letter c with letter a
+move position 7 to position 5
+rotate right 4 steps
+swap position 0 with position 5
+move position 3 to position 1
+swap letter c with letter h
+rotate based on position of letter d
+reverse positions 0 through 2
+rotate based on position of letter g
+move position 6 to position 7
+move position 2 to position 5
+swap position 1 with position 0
+swap letter f with letter c
+rotate right 1 step
+reverse positions 2 through 4
+rotate left 1 step
+rotate based on position of letter h
+rotate right 1 step
+rotate right 5 steps
+swap position 6 with position 3
+move position 0 to position 5
+swap letter g with letter f
+reverse positions 2 through 7
+reverse positions 4 through 6
+swap position 4 with position 1
+move position 2 to position 1
+move position 3 to position 1
+swap letter b with letter a
+rotate based on position of letter b
+reverse positions 3 through 5
+move position 0 to position 2
+rotate based on position of letter b
+reverse positions 4 through 5
+rotate based on position of letter g
+reverse positions 0 through 5
+swap letter h with letter c
+reverse positions 2 through 5
+swap position 7 with position 5
+swap letter g with letter d
+swap letter d with letter e
+move position 1 to position 2
+move position 3 to position 2
+swap letter d with letter g
+swap position 3 with position 7
+swap letter b with letter f
+rotate right 3 steps
+move position 5 to position 3
+move position 1 to position 2
+rotate based on position of letter b
+rotate based on position of letter c
+reverse positions 2 through 3
+move position 2 to position 3
+rotate right 1 step
+move position 7 to position 0
+rotate right 3 steps
+move position 6 to position 3
+rotate based on position of letter e
+swap letter c with letter b
+swap letter f with letter d
+swap position 2 with position 5
+swap letter f with letter g
+rotate based on position of letter a
+reverse positions 3 through 4
+rotate left 7 steps
+rotate left 6 steps
+swap letter g with letter b
+reverse positions 3 through 6
+rotate right 6 steps
+rotate based on position of letter c
+rotate based on position of letter b
+rotate left 1 step
+reverse positions 3 through 7
+swap letter f with letter g
+swap position 4 with position 1
+rotate based on position of letter d
+move position 0 to position 4
+swap position 7 with position 6
+rotate right 6 steps
+rotate based on position of letter e
+move position 7 to position 3
+rotate right 3 steps
+swap position 1 with position 2

2016/input/day_22.txt

@@ -0,0 +1,927 @@
+root@ebhq-gridcenter# df -h
+Filesystem              Size  Used  Avail  Use%
+/dev/grid/node-x0-y0     87T   71T    16T   81%
+/dev/grid/node-x0-y1     93T   72T    21T   77%
+/dev/grid/node-x0-y2     87T   67T    20T   77%
+/dev/grid/node-x0-y3     89T   65T    24T   73%
+/dev/grid/node-x0-y4     93T   67T    26T   72%
+/dev/grid/node-x0-y5     94T   65T    29T   69%
+/dev/grid/node-x0-y6     85T   64T    21T   75%
+/dev/grid/node-x0-y7     85T   69T    16T   81%
+/dev/grid/node-x0-y8     85T   71T    14T   83%
+/dev/grid/node-x0-y9     91T   68T    23T   74%
+/dev/grid/node-x0-y10    88T   65T    23T   73%
+/dev/grid/node-x0-y11    89T   66T    23T   74%
+/dev/grid/node-x0-y12    93T   68T    25T   73%
+/dev/grid/node-x0-y13    90T   67T    23T   74%
+/dev/grid/node-x0-y14    88T   69T    19T   78%
+/dev/grid/node-x0-y15    94T   69T    25T   73%
+/dev/grid/node-x0-y16    89T   67T    22T   75%
+/dev/grid/node-x0-y17    85T   69T    16T   81%
+/dev/grid/node-x0-y18    87T   64T    23T   73%
+/dev/grid/node-x0-y19    92T   66T    26T   71%
+/dev/grid/node-x0-y20    94T   69T    25T   73%
+/dev/grid/node-x0-y21    88T   65T    23T   73%
+/dev/grid/node-x0-y22    87T   72T    15T   82%
+/dev/grid/node-x0-y23    92T   66T    26T   71%
+/dev/grid/node-x0-y24    89T   72T    17T   80%
+/dev/grid/node-x1-y0     86T   66T    20T   76%
+/dev/grid/node-x1-y1     93T   64T    29T   68%
+/dev/grid/node-x1-y2     92T   65T    27T   70%
+/dev/grid/node-x1-y3     92T   70T    22T   76%
+/dev/grid/node-x1-y4     87T   72T    15T   82%
+/dev/grid/node-x1-y5     87T   69T    18T   79%
+/dev/grid/node-x1-y6     88T   72T    16T   81%
+/dev/grid/node-x1-y7     94T   68T    26T   72%
+/dev/grid/node-x1-y8     93T   70T    23T   75%
+/dev/grid/node-x1-y9     87T   69T    18T   79%
+/dev/grid/node-x1-y10    90T   66T    24T   73%
+/dev/grid/node-x1-y11    87T   67T    20T   77%
+/dev/grid/node-x1-y12    86T   66T    20T   76%
+/dev/grid/node-x1-y13    89T   67T    22T   75%
+/dev/grid/node-x1-y14    88T   73T    15T   82%
+/dev/grid/node-x1-y15    86T   71T    15T   82%
+/dev/grid/node-x1-y16    94T   68T    26T   72%
+/dev/grid/node-x1-y17    94T   66T    28T   70%
+/dev/grid/node-x1-y18    91T   73T    18T   80%
+/dev/grid/node-x1-y19    86T   64T    22T   74%
+/dev/grid/node-x1-y20    86T   66T    20T   76%
+/dev/grid/node-x1-y21    90T   70T    20T   77%
+/dev/grid/node-x1-y22    89T   69T    20T   77%
+/dev/grid/node-x1-y23    90T   67T    23T   74%
+/dev/grid/node-x1-y24    90T   64T    26T   71%
+/dev/grid/node-x2-y0     85T   69T    16T   81%
+/dev/grid/node-x2-y1     89T   68T    21T   76%
+/dev/grid/node-x2-y2     94T   65T    29T   69%
+/dev/grid/node-x2-y3     92T   70T    22T   76%
+/dev/grid/node-x2-y4     91T   71T    20T   78%
+/dev/grid/node-x2-y5     86T   73T    13T   84%
+/dev/grid/node-x2-y6     85T   73T    12T   85%
+/dev/grid/node-x2-y7     91T   71T    20T   78%
+/dev/grid/node-x2-y8     90T   71T    19T   78%
+/dev/grid/node-x2-y9     89T   68T    21T   76%
+/dev/grid/node-x2-y10    85T   65T    20T   76%
+/dev/grid/node-x2-y11    90T   68T    22T   75%
+/dev/grid/node-x2-y12    86T   66T    20T   76%
+/dev/grid/node-x2-y13    91T   70T    21T   76%
+/dev/grid/node-x2-y14    93T   68T    25T   73%
+/dev/grid/node-x2-y15    94T   64T    30T   68%
+/dev/grid/node-x2-y16    85T   65T    20T   76%
+/dev/grid/node-x2-y17    92T   68T    24T   73%
+/dev/grid/node-x2-y18    94T   67T    27T   71%
+/dev/grid/node-x2-y19    94T   69T    25T   73%
+/dev/grid/node-x2-y20    86T   65T    21T   75%
+/dev/grid/node-x2-y21    86T   67T    19T   77%
+/dev/grid/node-x2-y22    90T   68T    22T   75%
+/dev/grid/node-x2-y23    94T   69T    25T   73%
+/dev/grid/node-x2-y24    91T   72T    19T   79%
+/dev/grid/node-x3-y0     93T   71T    22T   76%
+/dev/grid/node-x3-y1     86T   67T    19T   77%
+/dev/grid/node-x3-y2     87T   68T    19T   78%
+/dev/grid/node-x3-y3     85T   73T    12T   85%
+/dev/grid/node-x3-y4     91T   73T    18T   80%
+/dev/grid/node-x3-y5     89T   65T    24T   73%
+/dev/grid/node-x3-y6     91T   72T    19T   79%
+/dev/grid/node-x3-y7     92T   67T    25T   72%
+/dev/grid/node-x3-y8     90T   71T    19T   78%
+/dev/grid/node-x3-y9     86T   67T    19T   77%
+/dev/grid/node-x3-y10    90T   67T    23T   74%
+/dev/grid/node-x3-y11    85T   71T    14T   83%
+/dev/grid/node-x3-y12    93T   64T    29T   68%
+/dev/grid/node-x3-y13    85T   71T    14T   83%
+/dev/grid/node-x3-y14    93T   64T    29T   68%
+/dev/grid/node-x3-y15    89T   64T    25T   71%
+/dev/grid/node-x3-y16    89T   72T    17T   80%
+/dev/grid/node-x3-y17    91T   65T    26T   71%
+/dev/grid/node-x3-y18    93T   65T    28T   69%
+/dev/grid/node-x3-y19    85T   65T    20T   76%
+/dev/grid/node-x3-y20    94T   72T    22T   76%
+/dev/grid/node-x3-y21    90T   66T    24T   73%
+/dev/grid/node-x3-y22    88T   67T    21T   76%
+/dev/grid/node-x3-y23    90T   72T    18T   80%
+/dev/grid/node-x3-y24    94T   68T    26T   72%
+/dev/grid/node-x4-y0     88T   67T    21T   76%
+/dev/grid/node-x4-y1     94T   67T    27T   71%
+/dev/grid/node-x4-y2     92T   66T    26T   71%
+/dev/grid/node-x4-y3     93T   66T    27T   70%
+/dev/grid/node-x4-y4     86T   66T    20T   76%
+/dev/grid/node-x4-y5     87T   68T    19T   78%
+/dev/grid/node-x4-y6     92T   68T    24T   73%
+/dev/grid/node-x4-y7     92T   66T    26T   71%
+/dev/grid/node-x4-y8     94T   66T    28T   70%
+/dev/grid/node-x4-y9     87T   73T    14T   83%
+/dev/grid/node-x4-y10    87T   69T    18T   79%
+/dev/grid/node-x4-y11    88T   68T    20T   77%
+/dev/grid/node-x4-y12    92T   73T    19T   79%
+/dev/grid/node-x4-y13    89T   73T    16T   82%
+/dev/grid/node-x4-y14    87T   66T    21T   75%
+/dev/grid/node-x4-y15    86T   68T    18T   79%
+/dev/grid/node-x4-y16    86T   70T    16T   81%
+/dev/grid/node-x4-y17    94T   64T    30T   68%
+/dev/grid/node-x4-y18    91T   69T    22T   75%
+/dev/grid/node-x4-y19    86T   67T    19T   77%
+/dev/grid/node-x4-y20    85T   64T    21T   75%
+/dev/grid/node-x4-y21    89T   69T    20T   77%
+/dev/grid/node-x4-y22    85T   68T    17T   80%
+/dev/grid/node-x4-y23    87T   70T    17T   80%
+/dev/grid/node-x4-y24    91T   65T    26T   71%
+/dev/grid/node-x5-y0     85T   66T    19T   77%
+/dev/grid/node-x5-y1     93T   65T    28T   69%
+/dev/grid/node-x5-y2     93T   64T    29T   68%
+/dev/grid/node-x5-y3     87T   65T    22T   74%
+/dev/grid/node-x5-y4     85T   69T    16T   81%
+/dev/grid/node-x5-y5     93T   73T    20T   78%
+/dev/grid/node-x5-y6     89T   66T    23T   74%
+/dev/grid/node-x5-y7    505T  493T    12T   97%
+/dev/grid/node-x5-y8     85T   72T    13T   84%
+/dev/grid/node-x5-y9     85T   66T    19T   77%
+/dev/grid/node-x5-y10    88T   70T    18T   79%
+/dev/grid/node-x5-y11    89T   69T    20T   77%
+/dev/grid/node-x5-y12    90T   69T    21T   76%
+/dev/grid/node-x5-y13    87T   64T    23T   73%
+/dev/grid/node-x5-y14    93T   64T    29T   68%
+/dev/grid/node-x5-y15    92T   64T    28T   69%
+/dev/grid/node-x5-y16    90T   66T    24T   73%
+/dev/grid/node-x5-y17    88T   64T    24T   72%
+/dev/grid/node-x5-y18    87T   67T    20T   77%
+/dev/grid/node-x5-y19    92T   71T    21T   77%
+/dev/grid/node-x5-y20    90T   68T    22T   75%
+/dev/grid/node-x5-y21    86T   69T    17T   80%
+/dev/grid/node-x5-y22    86T   70T    16T   81%
+/dev/grid/node-x5-y23    85T   73T    12T   85%
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2016/input/day_23.txt

@@ -0,0 +1,26 @@
+cpy a b
+dec b
+cpy a d
+cpy 0 a
+cpy b c
+inc a
+dec c
+jnz c -2
+dec d
+jnz d -5
+dec b
+cpy b c
+cpy c d
+dec d
+inc c
+jnz d -2
+tgl c
+cpy -16 c
+jnz 1 c
+cpy 94 c
+jnz 82 d
+inc a
+inc d
+jnz d -2
+inc c
+jnz c -5

2016/input/day_24.txt

@@ -0,0 +1,39 @@
+#########################################################################################################################################################################################
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+#########################################################################################################################################################################################

2016/input/day_25.txt

@@ -0,0 +1,30 @@
+cpy a d
+cpy 7 c
+cpy 365 b
+inc d
+dec b
+jnz b -2
+dec c
+jnz c -5
+cpy d a
+jnz 0 0
+cpy a b
+cpy 0 a
+cpy 2 c
+jnz b 2
+jnz 1 6
+dec b
+dec c
+jnz c -4
+inc a
+jnz 1 -7
+cpy 2 b
+jnz c 2
+jnz 1 4
+dec b
+dec c
+jnz 1 -4
+jnz 0 0
+out b
+jnz a -19
+jnz 1 -21

2016/ruby/Gemfile

@@ -0,0 +1,3 @@
+source 'https://rubygems.org'
+
+gem 'minitest'

2016/ruby/Gemfile.lock

@@ -0,0 +1,13 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    minitest (5.10.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  minitest
+
+BUNDLED WITH
+   1.13.6

2016/ruby/day_01.rb

@@ -0,0 +1,72 @@
+include Math
+
+Instruction = Struct.new(:direction, :blocks) do
+  def initialize(direction, blocks)
+    super(direction, blocks.to_i)
+  end
+end
+
+Turtle = Struct.new(:orientation, :location) do
+  def self.run(input)
+    instructions = parse(input)
+    turtles = [Turtle.new(-PI/2, [0,0])]
+
+    instructions.each.with_object(turtles) do |instruction, turtles|
+      turtles << turtles.last.turn(instruction.direction).step
+      (instruction.blocks - 1).times do
+        turtles << turtles.last.step
+      end
+    end
+
+    turtles
+  end
+
+  def self.parse(input)
+    input.split(', ').map {|step|
+      Instruction.new(*step.scan(/(?<turn>\w)(?<blocks>\d+)/)[0])
+    }
+  end
+
+  def turn(direction)
+    angle = case direction
+            when ?R
+              PI/2
+            when ?L
+              -PI/2
+            else
+              raise "unexpected direction: #{direction}"
+            end
+    Turtle.new(orientation + angle, location)
+  end
+
+  def step
+    x = location[0] + cos(orientation).to_i
+    y = location[1] + sin(orientation).to_i
+    Turtle.new(orientation, [x, y])
+  end
+end
+
+require 'minitest'
+# require 'minitest/autorun'
+class TestInstructions < Minitest::Test
+  def test_instructions
+    assert_distance 5, 'R2, L3'
+    assert_distance 2, 'R2, R2, R2'
+    assert_distance 12, 'R5, L5, R5, R3'
+  end
+
+  def assert_distance(expected, instructions)
+    assert_equal expected, Turtle.run(instructions).last.location.map(&:abs).inject(:+)
+  end
+end
+
+if __FILE__ == $0
+  turtles = Turtle.run(DATA.read)
+  p turtles.last
+
+  locations = turtles.map(&:location)
+  p locations.find {|location| locations.count(location) > 1 }
+end
+
+__END__
+R4, R3, L3, L2, L1, R1, L1, R2, R3, L5, L5, R4, L4, R2, R4, L3, R3, L3, R3, R4, R2, L1, R2, L3, L2, L1, R3, R5, L1, L4, R2, L4, R3, R1, R2, L5, R2, L189, R5, L5, R52, R3, L1, R4, R5, R1, R4, L1, L3, R2, L2, L3, R4, R3, L2, L5, R4, R5, L2, R2, L1, L3, R3, L4, R4, R5, L1, L1, R3, L5, L2, R76, R2, R2, L1, L3, R189, L3, L4, L1, L3, R5, R4, L1, R1, L1, L1, R2, L4, R2, L5, L5, L5, R2, L4, L5, R4, R4, R5, L5, R3, L1, L3, L1, L1, L3, L4, R5, L3, R5, R3, R3, L5, L5, R3, R4, L3, R3, R1, R3, R2, R2, L1, R1, L3, L3, L3, L1, R2, L1, R4, R4, L1, L1, R3, R3, R4, R1, L5, L2, R2, R3, R2, L3, R4, L5, R1, R4, R5, R4, L4, R1, L3, R1, R3, L2, L3, R1, L2, R3, L3, L1, L3, R4, L4, L5, R3, R5, R4, R1, L2, R3, R5, L5, L4, L1, L1

2016/ruby/day_02.rb

@@ -0,0 +1,87 @@
+class Keypad
+  MAP = [%w[ . . 1 . . ],
+         %w[ . 2 3 4 . ],
+         %w[ 5 6 7 8 9 ],
+         %w[ . A B C . ],
+         %w[ . . D . . ]]
+
+  attr_reader :x, :y
+
+  def initialize
+    @x, @y = 0, 2
+  end
+
+  def button
+    MAP[y][x]
+  end
+
+  def <<(dir)
+    delta = case dir
+            when ?U
+              [0, 1]
+            when ?D
+              [0, -1]
+            when ?L
+              [-1, 0]
+            when ?R
+              [1, 0]
+            else
+              raise "unexpected direction: '#{dir}'"
+            end
+    next_x = x + delta[0]
+    next_y = y - delta[1]
+
+    next_x = [[4, next_x].min, 0].max
+    next_y = [[4, next_y].min, 0].max
+
+    @x, @y = next_x, next_y if MAP[next_y][next_x] != ?.
+  end
+end
+
+if __FILE__ == $0
+  keypad = Keypad.new
+  code = DATA.read.lines.map {|line|
+    line.strip.chars.each do |char|
+      keypad << char
+    end
+    keypad.button
+  }
+  puts code.join
+end
+
+require 'minitest'
+# require 'minitest/autorun'
+
+class TestDay2 < Minitest::Test
+  def test_day2
+    keypad = Keypad.new
+    assert_equal ?5, keypad.button
+
+    'ULL'.chars.each do |char|
+      keypad << char
+    end
+    assert_equal ?5, keypad.button
+
+    'RRDDD'.chars.each do |char|
+      keypad << char
+    end
+    assert_equal ?D, keypad.button
+
+    'LURDL'.chars.each do |char|
+      keypad << char
+    end
+    assert_equal ?B, keypad.button
+
+    'UUUUD'.chars.each do |char|
+      keypad << char
+    end
+    assert_equal ?3, keypad.button
+  end
+end
+
+__END__
+RDRRDLRRUDRUUUULDDRDUULLDUULDURDDUDRULDLUDDRLRDUDDURRRRURDURLLRDRUUULDLLLURDRLLULLUULULLLDLLLRRURRLRDUULRURRUDRRDRLURLRURLLULRUURRUURDDLDRDLDLLUDUULLLUUUUDULLDRRUURLDURDDDDDRLLRRURDLUDRRUUDLRRLLRDURDUDDDLRDDRDLRULLUULRULRLLULDDRURUUDLDDULDRLLURDDUDDUDRDUDLDRRRDURRLDRDRLDLLDUDDDULULRRULRLLURDRRDDUUUUUULRUDLRRDURDLRDLUDLDURUDDUUURUDLUUULDLRDURDLDUUDLDDDURUUDUUDRLRDULLDUULUDRUDRLRRRDLLDRUDULRRUDDURLDRURRLLRRRDRLLDLULULRRUURRURLLUDRRLRULURLDDDDDURUDRRRRULLUUDLDDLUUL
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
+URLURDDRLLURRRLDLDLUDUURDRUDLLLRRDLUUULRRLURRRLUDUDLRLDDRUDLRRRULUDUDLLLULULLLRUDULDDDLLLRRRLRURDULUDDDULDLULURRRDLURDLRLLDUDRUDURDRRURULDRDUDLLRDDDUDDURLUULLULRDRRLDDLDURLRRRLDRDLDULRULRRRLRLLDULRDLURLRUUDURRUUDLLUDRUDLRLDUUDLURRRDDUUDUDRLDLDDRURDDLLDDRDLRLRDLLLUDLUUDRLRLRDDRDLRDLLUULLLLUULLDLLDLRDLRLRRLUUDLLRLRUDRURULRLRLULUDRLLUDDUDDULRLDDRUUUURULDRRULLLDUURULUDRLLURLRRLDLRRLDDRRRDUDDUDLDDLULUDDUURDLLLRLDLRDRUUUUUDDDLDRDDRRRLRURRRRDURDRURUDLURRURDRLRUUDDLDRRULLDURDRLRRDURURUULRDUDLDRDDLULULRDRRUDDRLLRLULRLLUUDRDUUDDUDLRUUDLLUULLRUULUDDLURRRLLDRLRRLLRULLDUULURLLLLUUULDR
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
+LURLUURLURDUUDRUDLDLLURRRDLDRRRULDDRRDRDUUDRUDURDDDURLUDDLULUULRRLLRULUDRDDRRRLDURDUDDURDDDLRLDDLULLDRDDLUUDUURRRLULRUURRRRLLULDUDRDUURRRURRDRDUDUDLUDULLDLDDRLUDRURDULURLURRLLURLLLRLUURLRUDLUDDRLURRUULULRLURRURUDURDLDLDDUDDRDLLRLLRRULDDRUDURUDDDUDLLRDLRUDULLLRRRUURUDUUULLRDUDRURUDULLDLLUUUDRULRLLRRDDDDUDULDRDRLLDDLLDDDURRUDURLDLRDRUURDDURLRDRURLRRLLRLULDRRLRUDURDUURRLUUULUDDDLRLULRDRLLURRRDLURDUUDRRRLUURRLLUDLUDLUULLRRDLLRDDRURRUURLDDLRLRLRUDLDLRLRDRRDLLLRDLRDUDLLDDDRD

2016/ruby/day_05.rb

@@ -0,0 +1,22 @@
+require 'digest/md5'
+
+door_id = 'wtnhxymk'
+password = Array.new(8, nil)
+
+VALID = (0..7).map(&:to_s).to_a
+
+index = 0
+while password.any?(&:nil?)
+  puts index if index % 1000000 == 0
+  hash = Digest::MD5.hexdigest("#{door_id}#{index}")
+  if hash.start_with?('00000')
+    i = hash[5]
+    if VALID.include?(i) && password[i.to_i].nil?
+      password[i.to_i] = hash[6]
+      p hash, password
+    end
+  end
+  index += 1
+end
+
+puts password.join

2016/ruby/day_06.rb

@@ -0,0 +1,607 @@
+counts = Array.new(8) { Hash.new(0) }
+DATA.read.lines.each.with_object(counts) do |line, counts|
+  (0..7).each do |i|
+    counts[i][line[i]] += 1
+  end
+end
+p counts.map {|h| h.sort_by(&:last).first.first }.join
+
+__END__
+eqvmfqnf
+jvkezmqt
+zcssqwlw
+cuacncgg
+ikmpzpoh
+dzpzobdl
+qlsnuhuq
+fwqnoklz
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2016/ruby/day_08.rb

@@ -0,0 +1,258 @@
+class Screen
+  attr_reader :width, :height, :pixels
+
+  def initialize(width, height)
+    @width, @height = width, height
+    @pixels = Array.new(height) { Array.new(width, false) }
+  end
+
+  def to_s
+    pixels.map {|row| row.map {|pixel| pixel ? ?# : ?. }.join }.join("\n")
+  end
+
+  def <<(instruction)
+    case instruction
+    when /rect (\d+)x(\d+)/
+      $1.to_i.times do |x|
+        $2.to_i.times do |y|
+          pixels[y][x] = true
+        end
+      end
+    when /rotate column x=(\d+) by (\d+)/
+      col = pixels.map {|row| row[$1.to_i] }.rotate(-$2.to_i)
+      pixels.each do |row|
+        row[$1.to_i] = col.shift
+      end
+    when /rotate row y=(\d+) by (\d+)/
+      row = pixels[$1.to_i].rotate(-$2.to_i)
+      pixels[$1.to_i] = row
+    end
+  end
+end
+
+if __FILE__ == $0
+  screen = Screen.new(50, 6)
+  DATA.lines.each do |line|
+    screen << line
+  end
+
+  puts screen
+  puts screen.pixels.map {|row| row.count {|pixel| pixel }}.inject(:+)
+end
+
+require 'minitest'
+# require 'minitest/autorun'
+
+class TestScreen < Minitest::Test
+  def test_screen
+    screen = Screen.new(7, 3)
+    assert_equal <<-PIXELS.chomp, screen.to_s
+.......
+.......
+.......
+    PIXELS
+
+    screen << 'rect 3x2'
+    assert_equal <<-PIXELS.chomp, screen.to_s
+###....
+###....
+.......
+    PIXELS
+
+    screen << 'rotate column x=1 by 1'
+    assert_equal <<-PIXELS.chomp, screen.to_s
+#.#....
+###....
+.#.....
+    PIXELS
+
+    screen << 'rotate row y=0 by 4'
+    assert_equal <<-PIXELS.chomp, screen.to_s
+....#.#
+###....
+.#.....
+    PIXELS
+
+    screen << 'rotate column x=1 by 1'
+    assert_equal <<-PIXELS.chomp, screen.to_s
+.#..#.#
+#.#....
+.#.....
+    PIXELS
+  end
+end
+
+__END__
+rect 1x1
+rotate row y=0 by 20
+rect 1x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 3
+rect 2x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 3
+rect 2x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 4
+rect 2x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 3
+rect 2x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 5
+rect 1x1
+rotate row y=0 by 2
+rect 1x1
+rotate row y=0 by 6
+rect 5x1
+rotate row y=0 by 2
+rect 1x3
+rotate row y=2 by 8
+rotate row y=0 by 8
+rotate column x=0 by 1
+rect 7x1
+rotate row y=2 by 24
+rotate row y=0 by 20
+rotate column x=5 by 1
+rotate column x=4 by 2
+rotate column x=2 by 2
+rotate column x=0 by 1
+rect 7x1
+rotate column x=34 by 2
+rotate column x=22 by 1
+rotate column x=15 by 1
+rotate row y=2 by 18
+rotate row y=0 by 12
+rotate column x=8 by 2
+rotate column x=7 by 1
+rotate column x=5 by 2
+rotate column x=2 by 1
+rotate column x=0 by 1
+rect 9x1
+rotate row y=3 by 28
+rotate row y=1 by 28
+rotate row y=0 by 20
+rotate column x=18 by 1
+rotate column x=15 by 1
+rotate column x=14 by 1
+rotate column x=13 by 1
+rotate column x=12 by 2
+rotate column x=10 by 3
+rotate column x=8 by 1
+rotate column x=7 by 2
+rotate column x=6 by 1
+rotate column x=5 by 1
+rotate column x=3 by 1
+rotate column x=2 by 2
+rotate column x=0 by 1
+rect 19x1
+rotate column x=34 by 2
+rotate column x=24 by 1
+rotate column x=23 by 1
+rotate column x=14 by 1
+rotate column x=9 by 2
+rotate column x=4 by 2
+rotate row y=3 by 5
+rotate row y=2 by 3
+rotate row y=1 by 7
+rotate row y=0 by 5
+rotate column x=0 by 2
+rect 3x2
+rotate column x=16 by 2
+rotate row y=3 by 27
+rotate row y=2 by 5
+rotate row y=0 by 20
+rotate column x=8 by 2
+rotate column x=7 by 1
+rotate column x=5 by 1
+rotate column x=3 by 3
+rotate column x=2 by 1
+rotate column x=1 by 2
+rotate column x=0 by 1
+rect 9x1
+rotate row y=4 by 42
+rotate row y=3 by 40
+rotate row y=1 by 30
+rotate row y=0 by 40
+rotate column x=37 by 2
+rotate column x=36 by 3
+rotate column x=35 by 1
+rotate column x=33 by 1
+rotate column x=32 by 1
+rotate column x=31 by 3
+rotate column x=30 by 1
+rotate column x=28 by 1
+rotate column x=27 by 1
+rotate column x=25 by 1
+rotate column x=23 by 3
+rotate column x=22 by 1
+rotate column x=21 by 1
+rotate column x=20 by 1
+rotate column x=18 by 1
+rotate column x=17 by 1
+rotate column x=16 by 3
+rotate column x=15 by 1
+rotate column x=13 by 1
+rotate column x=12 by 1
+rotate column x=11 by 2
+rotate column x=10 by 1
+rotate column x=8 by 1
+rotate column x=7 by 2
+rotate column x=5 by 1
+rotate column x=3 by 3
+rotate column x=2 by 1
+rotate column x=1 by 1
+rotate column x=0 by 1
+rect 39x1
+rotate column x=44 by 2
+rotate column x=42 by 2
+rotate column x=35 by 5
+rotate column x=34 by 2
+rotate column x=32 by 2
+rotate column x=29 by 2
+rotate column x=25 by 5
+rotate column x=24 by 2
+rotate column x=19 by 2
+rotate column x=15 by 4
+rotate column x=14 by 2
+rotate column x=12 by 3
+rotate column x=9 by 2
+rotate column x=5 by 5
+rotate column x=4 by 2
+rotate row y=5 by 5
+rotate row y=4 by 38
+rotate row y=3 by 10
+rotate row y=2 by 46
+rotate row y=1 by 10
+rotate column x=48 by 4
+rotate column x=47 by 3
+rotate column x=46 by 3
+rotate column x=45 by 1
+rotate column x=43 by 1
+rotate column x=37 by 5
+rotate column x=36 by 5
+rotate column x=35 by 4
+rotate column x=33 by 1
+rotate column x=32 by 5
+rotate column x=31 by 5
+rotate column x=28 by 5
+rotate column x=27 by 5
+rotate column x=26 by 3
+rotate column x=25 by 4
+rotate column x=23 by 1
+rotate column x=17 by 5
+rotate column x=16 by 5
+rotate column x=13 by 1
+rotate column x=12 by 5
+rotate column x=11 by 5
+rotate column x=3 by 1
+rotate column x=0 by 1

2016/ruby/day_10.rb

@@ -0,0 +1,341 @@
+class Factory
+  attr_reader :bots, :bins
+
+  def initialize
+    @bots = Hash.new {|h,k| h[k] = Bot.new(self) }
+    @bins = Hash.new {|h,k| h[k] = Bin.new }
+  end
+
+  def <<(instruction)
+    case instruction
+    when /value (\d+) goes to bot (\d+)/
+      bots[$2.to_i] << $1.to_i
+    when /bot (\d+) gives low to (.+) (\d+) and high to (.+) (\d+)/
+      bot = bots[$1.to_i]
+      bot.outs = [out($2, $3.to_i),
+                  out($4, $5.to_i)]
+    else
+      raise "invalid instruction: #{instruction}"
+    end
+  end
+
+  private
+
+  def out(type, id)
+    case type
+    when 'bot'
+      bots[id]
+    when 'output'
+      bins[id]
+    else
+      raise "invalid type: #{type}"
+    end
+  end
+end
+
+class Bot
+  attr_reader :factory, :values, :outs, :log
+
+  def initialize(factory)
+    @factory = factory
+    @values = []
+    @log = []
+  end
+
+  def <<(value)
+    values << value
+    try_run
+  end
+
+  def outs=(outs)
+    @outs = outs
+    try_run
+  end
+
+  private
+
+  def try_run
+    return unless outs && values.size == 2
+
+    log << values.sort
+
+    low, high = values.sort
+    values.clear
+
+    outs[0] << low
+    outs[1] << high
+  end
+end
+
+class Bin
+  attr_reader :value
+
+  def <<(value)
+    @value = value
+  end
+end
+
+if __FILE__ == $0
+  factory = Factory.new
+  DATA.each_line do |line|
+    factory << line
+  end
+
+  p factory.bins.values_at(0, 1, 2).map(&:value).inject(:*)
+end
+
+require 'minitest'
+# require 'minitest/autorun'
+
+class TestDay10 < Minitest::Test
+  def test_day_10
+    instructions = <<INSTRUCTIONS
+value 5 goes to bot 2
+bot 2 gives low to bot 1 and high to bot 0
+value 3 goes to bot 1
+bot 1 gives low to output 1 and high to bot 0
+bot 0 gives low to output 2 and high to output 0
+value 2 goes to bot 2
+INSTRUCTIONS
+
+    factory = Factory.new
+    instructions.lines.each do |line|
+      factory << line
+    end
+
+    assert_equal [5, 2, 3], factory.bins.sort_by {|k,_| k }.map(&:last).map(&:value)
+  end
+end
+
+__END__
+bot 135 gives low to bot 27 and high to bot 166
+bot 57 gives low to bot 4 and high to bot 186
+bot 115 gives low to output 2 and high to bot 80
+bot 44 gives low to bot 175 and high to bot 88
+bot 167 gives low to bot 42 and high to bot 168
+bot 18 gives low to bot 32 and high to bot 89
+bot 199 gives low to bot 75 and high to bot 40
+bot 129 gives low to bot 178 and high to bot 147
+bot 163 gives low to bot 49 and high to bot 160
+value 2 goes to bot 143
+bot 176 gives low to bot 139 and high to bot 117
+bot 194 gives low to bot 11 and high to bot 37
+bot 99 gives low to bot 163 and high to bot 138
+value 53 goes to bot 9
+bot 159 gives low to output 1 and high to bot 207
+bot 0 gives low to bot 105 and high to bot 13
+bot 6 gives low to bot 66 and high to bot 116
+bot 81 gives low to bot 54 and high to bot 10
+bot 27 gives low to bot 188 and high to bot 199
+bot 186 gives low to bot 84 and high to bot 123
+bot 154 gives low to bot 21 and high to bot 107
+bot 188 gives low to bot 92 and high to bot 75
+bot 164 gives low to bot 115 and high to bot 28
+bot 106 gives low to bot 48 and high to bot 155
+bot 193 gives low to bot 101 and high to bot 110
+bot 136 gives low to bot 166 and high to bot 152
+bot 7 gives low to bot 156 and high to bot 24
+bot 103 gives low to bot 182 and high to bot 0
+bot 101 gives low to bot 16 and high to bot 72
+bot 86 gives low to bot 102 and high to bot 48
+bot 78 gives low to bot 177 and high to bot 113
+value 17 goes to bot 198
+bot 54 gives low to bot 161 and high to bot 111
+bot 46 gives low to bot 74 and high to bot 39
+bot 22 gives low to bot 56 and high to bot 161
+bot 5 gives low to bot 186 and high to bot 123
+bot 137 gives low to bot 202 and high to bot 85
+bot 202 gives low to bot 108 and high to bot 118
+bot 174 gives low to bot 0 and high to bot 21
+bot 119 gives low to bot 68 and high to bot 53
+bot 151 gives low to bot 83 and high to bot 164
+bot 160 gives low to bot 33 and high to bot 97
+bot 76 gives low to bot 40 and high to bot 120
+bot 60 gives low to bot 103 and high to bot 174
+bot 203 gives low to bot 120 and high to bot 132
+bot 157 gives low to bot 116 and high to bot 11
+bot 98 gives low to bot 208 and high to bot 16
+bot 142 gives low to bot 114 and high to bot 71
+bot 143 gives low to bot 198 and high to bot 146
+bot 30 gives low to bot 59 and high to bot 135
+bot 87 gives low to bot 39 and high to bot 104
+bot 161 gives low to bot 173 and high to bot 125
+bot 104 gives low to bot 34 and high to bot 68
+bot 70 gives low to bot 112 and high to bot 176
+bot 92 gives low to bot 122 and high to bot 46
+bot 148 gives low to bot 28 and high to bot 58
+bot 49 gives low to output 0 and high to bot 33
+bot 140 gives low to bot 136 and high to bot 134
+bot 16 gives low to bot 170 and high to bot 79
+bot 13 gives low to bot 204 and high to bot 22
+bot 189 gives low to bot 148 and high to bot 45
+bot 89 gives low to bot 73 and high to bot 86
+value 31 goes to bot 50
+bot 166 gives low to bot 199 and high to bot 76
+bot 178 gives low to output 5 and high to bot 159
+bot 58 gives low to bot 167 and high to bot 126
+bot 149 gives low to bot 180 and high to bot 153
+bot 131 gives low to bot 97 and high to bot 66
+bot 64 gives low to bot 192 and high to bot 44
+bot 117 gives low to bot 140 and high to bot 134
+bot 156 gives low to bot 174 and high to bot 154
+value 11 goes to bot 19
+bot 1 gives low to bot 26 and high to bot 144
+bot 171 gives low to output 7 and high to bot 150
+bot 31 gives low to bot 110 and high to bot 127
+value 5 goes to bot 162
+bot 9 gives low to bot 8 and high to bot 128
+bot 93 gives low to bot 109 and high to bot 188
+value 47 goes to bot 184
+bot 80 gives low to output 19 and high to bot 42
+bot 155 gives low to bot 149 and high to bot 52
+bot 108 gives low to output 14 and high to bot 47
+bot 165 gives low to bot 200 and high to bot 141
+bot 184 gives low to bot 162 and high to bot 20
+bot 50 gives low to bot 143 and high to bot 4
+bot 28 gives low to bot 80 and high to bot 167
+bot 66 gives low to bot 151 and high to bot 55
+bot 201 gives low to bot 124 and high to bot 41
+bot 204 gives low to bot 94 and high to bot 56
+bot 134 gives low to bot 152 and high to bot 203
+bot 51 gives low to bot 36 and high to bot 142
+bot 2 gives low to bot 52 and high to bot 201
+bot 183 gives low to bot 38 and high to bot 78
+bot 26 gives low to bot 142 and high to bot 69
+bot 182 gives low to bot 3 and high to bot 105
+bot 72 gives low to bot 79 and high to bot 209
+bot 8 gives low to bot 185 and high to bot 65
+bot 75 gives low to bot 46 and high to bot 87
+bot 38 gives low to bot 82 and high to bot 177
+bot 147 gives low to bot 159 and high to bot 207
+bot 195 gives low to bot 104 and high to bot 119
+bot 63 gives low to bot 126 and high to bot 172
+bot 144 gives low to bot 69 and high to bot 82
+bot 83 gives low to output 3 and high to bot 115
+bot 43 gives low to bot 194 and high to bot 91
+value 37 goes to bot 8
+bot 82 gives low to bot 193 and high to bot 31
+bot 150 gives low to output 18 and high to bot 49
+value 23 goes to bot 182
+bot 67 gives low to bot 61 and high to bot 165
+bot 77 gives low to bot 107 and high to bot 122
+bot 130 gives low to bot 141 and high to bot 30
+value 73 goes to bot 12
+bot 41 gives low to bot 99 and high to bot 208
+bot 170 gives low to bot 131 and high to bot 6
+bot 120 gives low to bot 195 and high to bot 132
+bot 118 gives low to bot 47 and high to bot 129
+bot 100 gives low to bot 150 and high to bot 163
+value 67 goes to bot 185
+bot 152 gives low to bot 76 and high to bot 203
+bot 162 gives low to bot 67 and high to bot 205
+value 7 goes to bot 32
+bot 121 gives low to bot 172 and high to bot 158
+bot 65 gives low to bot 57 and high to bot 5
+bot 122 gives low to bot 81 and high to bot 74
+bot 21 gives low to bot 13 and high to bot 17
+bot 23 gives low to bot 133 and high to bot 1
+bot 36 gives low to bot 201 and high to bot 114
+bot 138 gives low to bot 160 and high to bot 131
+bot 55 gives low to bot 164 and high to bot 148
+bot 123 gives low to bot 70 and high to bot 176
+value 61 goes to bot 61
+bot 107 gives low to bot 17 and high to bot 81
+bot 19 gives low to bot 60 and high to bot 156
+value 41 goes to bot 12
+value 29 goes to bot 18
+value 13 goes to bot 60
+bot 62 gives low to bot 20 and high to bot 64
+bot 40 gives low to bot 87 and high to bot 195
+bot 90 gives low to bot 64 and high to bot 112
+bot 69 gives low to bot 71 and high to bot 193
+bot 35 gives low to output 4 and high to bot 108
+bot 177 gives low to bot 31 and high to bot 113
+bot 59 gives low to bot 93 and high to bot 27
+bot 187 gives low to bot 89 and high to bot 94
+bot 73 gives low to output 9 and high to bot 102
+bot 45 gives low to bot 58 and high to bot 63
+bot 39 gives low to bot 23 and high to bot 34
+bot 110 gives low to bot 72 and high to bot 190
+bot 181 gives low to bot 15 and high to bot 93
+bot 95 gives low to bot 7 and high to bot 15
+bot 33 gives low to output 13 and high to bot 169
+bot 20 gives low to bot 205 and high to bot 192
+bot 158 gives low to bot 85 and high to bot 29
+bot 61 gives low to bot 14 and high to bot 200
+value 71 goes to bot 103
+bot 192 gives low to bot 130 and high to bot 175
+bot 112 gives low to bot 44 and high to bot 139
+bot 96 gives low to bot 144 and high to bot 38
+bot 32 gives low to output 11 and high to bot 73
+bot 180 gives low to output 10 and high to bot 171
+value 59 goes to bot 3
+bot 208 gives low to bot 138 and high to bot 170
+bot 198 gives low to bot 184 and high to bot 62
+bot 207 gives low to output 16 and high to output 8
+bot 196 gives low to bot 43 and high to bot 91
+bot 10 gives low to bot 111 and high to bot 133
+bot 168 gives low to bot 35 and high to bot 202
+bot 113 gives low to bot 127 and high to bot 196
+bot 169 gives low to output 20 and high to bot 83
+bot 3 gives low to bot 18 and high to bot 187
+bot 52 gives low to bot 153 and high to bot 124
+bot 190 gives low to bot 209 and high to bot 43
+bot 125 gives low to bot 2 and high to bot 36
+bot 173 gives low to bot 155 and high to bot 2
+bot 153 gives low to bot 171 and high to bot 100
+bot 34 gives low to bot 1 and high to bot 96
+bot 84 gives low to bot 90 and high to bot 70
+bot 12 gives low to bot 9 and high to bot 128
+bot 24 gives low to bot 154 and high to bot 77
+bot 179 gives low to bot 63 and high to bot 121
+bot 85 gives low to bot 118 and high to bot 29
+bot 11 gives low to bot 189 and high to bot 145
+bot 116 gives low to bot 55 and high to bot 189
+bot 132 gives low to bot 119 and high to bot 53
+bot 15 gives low to bot 24 and high to bot 109
+bot 102 gives low to output 15 and high to bot 197
+value 43 goes to bot 206
+bot 37 gives low to bot 145 and high to bot 25
+bot 53 gives low to bot 183 and high to bot 78
+bot 197 gives low to output 12 and high to bot 180
+bot 47 gives low to output 17 and high to bot 178
+bot 17 gives low to bot 22 and high to bot 54
+bot 56 gives low to bot 106 and high to bot 173
+bot 191 gives low to bot 135 and high to bot 136
+bot 127 gives low to bot 190 and high to bot 196
+bot 172 gives low to bot 137 and high to bot 158
+bot 4 gives low to bot 146 and high to bot 84
+bot 42 gives low to output 6 and high to bot 35
+bot 145 gives low to bot 45 and high to bot 179
+bot 133 gives low to bot 51 and high to bot 26
+bot 139 gives low to bot 88 and high to bot 117
+bot 105 gives low to bot 187 and high to bot 204
+bot 126 gives low to bot 168 and high to bot 137
+bot 128 gives low to bot 65 and high to bot 5
+bot 114 gives low to bot 41 and high to bot 98
+bot 14 gives low to bot 206 and high to bot 95
+bot 91 gives low to bot 37 and high to bot 25
+bot 206 gives low to bot 19 and high to bot 7
+value 19 goes to bot 14
+bot 185 gives low to bot 50 and high to bot 57
+bot 205 gives low to bot 165 and high to bot 130
+bot 109 gives low to bot 77 and high to bot 92
+bot 175 gives low to bot 30 and high to bot 191
+bot 29 gives low to bot 129 and high to bot 147
+bot 74 gives low to bot 10 and high to bot 23
+bot 94 gives low to bot 86 and high to bot 106
+bot 25 gives low to bot 179 and high to bot 121
+bot 71 gives low to bot 98 and high to bot 101
+bot 209 gives low to bot 157 and high to bot 194
+bot 88 gives low to bot 191 and high to bot 140
+bot 124 gives low to bot 100 and high to bot 99
+bot 97 gives low to bot 169 and high to bot 151
+bot 141 gives low to bot 181 and high to bot 59
+bot 146 gives low to bot 62 and high to bot 90
+bot 200 gives low to bot 95 and high to bot 181
+bot 79 gives low to bot 6 and high to bot 157
+bot 48 gives low to bot 197 and high to bot 149
+value 3 goes to bot 67
+bot 68 gives low to bot 96 and high to bot 183
+bot 111 gives low to bot 125 and high to bot 51

2016/ruby/day_11.rb

@@ -0,0 +1,203 @@
+require 'delegate'
+
+State = Struct.new(:floors, :elevator) do
+  def self.from_s(input)
+    elevator = nil
+    floors = input.lines.reverse.map.with_index {|line, index|
+      _, e, *items = line.split(/\s+/)
+      elevator = index if e == ?E
+      Floor.new(items.reject {|item| item == ?. })
+    }
+    new(floors, elevator)
+  end
+
+  def ==(state)
+    eql?(state)
+  end
+
+  def eql?(state)
+    elevator == state.elevator && floors.zip(state.floors).all? {|a,b| a.eql?(b) }
+  end
+
+  def candidates
+    [-1, 1].flat_map {|delta|
+      next_floor = elevator + delta
+      next [] unless (0...floors.size).cover?(next_floor)
+
+      elevator_items = [1, 2].flat_map {|n| current_floor.to_a.combination(n).to_a }
+      elevator_items.map {|items| move(items, elevator, next_floor) }
+    }
+  end
+
+  def irradiated?
+    floors.any?(&:irradiated?)
+  end
+
+  def to_s
+    floors.map.with_index {|floor, index|
+      "#{elevator == index ??E:?.} #{floor.inspect}"
+    }.reverse.join("\n")
+  end
+
+  private
+
+  def current_floor
+    floors[elevator]
+  end
+
+  def move(items, from, to)
+    from_floor = Floor.new(floors[from] - items)
+    to_floor = Floor.new(floors[to] + items)
+
+    floors = self.floors.clone
+    floors[from] = from_floor
+    floors[to] = to_floor
+
+    self.class.new(floors, to)
+  end
+end
+
+class Floor < SimpleDelegator
+  attr_reader :source
+
+  def initialize(items)
+    @source = super(Set.new(items))
+  end
+
+  def microchips
+    source.select {|item| item.end_with?(?M) }.map {|item| item.chomp(?M) }
+  end
+
+  def generators
+    source.select {|item| item.end_with?(?G) }.map {|item| item.chomp(?G) }
+  end
+
+  def shielded
+    microchips & generators
+  end
+
+  def irradiated?
+    !(generators.empty? || (microchips - generators).empty?)
+  end
+
+  def hash
+    id.hash
+  end
+
+  def eql?(floor)
+    id == floor.id
+  end
+
+  def id
+    [shielded.size, (microchips - shielded).size, (generators - shielded).size]
+  end
+end
+
+if __FILE__ == $0
+  INPUT = <<-INPUT
+F4 .
+F3 .  CoM CuM RM PlM
+F2 .  CoG CuG RG PlG
+F1 E  PrG PrM EG EM DG DM
+  INPUT
+
+  Step = Struct.new(:state, :count)
+  seen = Set.new
+  steps = [Step.new(State.from_s(INPUT), 0)]
+
+  until steps.empty? do
+    step = steps.shift
+
+    # puts
+    # puts "Steps: #{step.count}"
+    # puts step.state
+
+    if step.state.floors[0..-2].all?(&:empty?)
+      puts
+      puts "Steps: #{step.count}"
+      puts step.state
+      exit
+    end
+
+    step.state.candidates.each do |candidate|
+      next if seen.include?(candidate)
+
+      seen << candidate
+      next if candidate.irradiated?
+
+      steps << Step.new(candidate, step.count + 1)
+    end
+  end
+end
+
+require 'minitest/autorun'
+
+class TestDay11 < Minitest::Test
+  INPUT = <<-INPUT
+F4 .  .  .  .  .
+F3 .  .  .  LG .
+F2 .  HG .  .  .
+F1 E  .  HM .  LM
+  INPUT
+
+  def setup
+    @state = State.from_s(INPUT)
+  end
+
+  def test_initialize
+    assert_equal 4, @state.floors.size
+    assert_equal 0, @state.elevator
+
+    floor = @state.floors[0]
+    assert_equal 2, floor.size
+    assert_equal %w[ H L ], floor.microchips
+    assert_empty floor.generators
+  end
+
+  def test_equality
+    state = State.from_s(<<-INPUT)
+F4 .  .  .  .  .
+F3 .  .  .  HG .
+F2 .  LG .  .  .
+F1 E  .  HM .  LM
+  INPUT
+    assert_equal @state, state
+    assert_equal @state.hash, state.hash
+    assert @state.eql?(state)
+
+    set = Set.new
+    set << @state
+    assert_includes set, @state
+    assert_includes set, state
+  end
+
+  def test_candidates
+    candidates = @state.candidates
+    assert_equal 3, candidates.size
+
+    candidate = candidates[0]
+    assert_equal 1, candidate.elevator
+    assert_equal %W[ LM ], candidate.floors[0].to_a
+    assert_equal %W[ HG HM ], candidate.floors[1].to_a
+
+    candidate = candidates[1]
+    assert_equal 1, candidate.elevator
+    assert_equal %W[ HM ], candidate.floors[0].to_a
+    assert_equal %W[ HG LM ], candidate.floors[1].to_a
+
+    candidate = candidates[2]
+    assert_equal 1, candidate.elevator
+    assert_empty candidate.floors[0]
+    assert_equal %W[ HG HM LM ], candidate.floors[1].to_a
+  end
+
+  def test_irradiated
+    refute Floor.new(%w[]).irradiated?
+    refute Floor.new(%w[ BM ]).irradiated?
+    refute Floor.new(%w[ BG ]).irradiated?
+    refute Floor.new(%w[ BM BG ]).irradiated?
+    refute Floor.new(%w[ BM BG LG ]).irradiated?
+
+    assert Floor.new(%w[ BM LG ]).irradiated?
+  end
+end

2016/ruby/day_12.rb

@@ -0,0 +1,51 @@
+registers = { ?a => 0, ?b => 0, ?c => 1, ?d => 0 }
+pc = 0
+data = DATA.each_line.to_a
+
+while pc < data.size
+  line = data[pc]
+  case line
+  when /cpy ([a-d]|\d+) ([a-d])/
+    value = registers.fetch($1) { $1.to_i }
+    registers[$2] = value
+    pc += 1
+  when /inc ([a-d])/
+    registers[$1] += 1
+    pc += 1
+  when /dec ([a-d])/
+    registers[$1] -= 1
+    pc += 1
+  when /jnz ([a-d]|\d+) (-?\d+)/
+    value = registers.fetch($1) { $1.to_i }
+    pc += value.zero? ? 1 : $2.to_i
+  else
+    raise "invalid line: #{line}"
+  end
+end
+
+p registers
+
+__END__
+cpy 1 a
+cpy 1 b
+cpy 26 d
+jnz c 2
+jnz 1 5
+cpy 7 c
+inc d
+dec c
+jnz c -2
+cpy a c
+inc a
+dec b
+jnz b -2
+cpy c b
+dec d
+jnz d -6
+cpy 16 c
+cpy 17 d
+inc a
+dec d
+jnz d -2
+dec c
+jnz c -5

2016/ruby/day_13.rb

@@ -0,0 +1,87 @@
+class Maze
+  attr_reader :walls
+
+  def initialize(seed)
+    @walls = Hash.new {|h,(x,y)|
+      num = x*x + 3*x + 2*x*y + y + y*y + seed
+      h[[x,y]] = num.to_s(2).chars.count {|c| c == ?1 }.odd?
+    }
+  end
+
+  def [](x,y)
+    walls[[x, y]]
+  end
+
+  def solve(start)
+    Solver.new(self, start)
+  end
+
+  class Solver
+    attr_reader :maze, :seen, :current
+
+    def initialize(maze, start)
+      @maze = maze
+      @seen = Set.new
+      @current = [[start, 0]]
+    end
+
+    def walk
+      return enum_for(__method__) unless block_given?
+
+      loop do
+        pos, count = current.shift
+        seen << pos
+        x,y = pos
+
+        [[1,0], [-1,0], [0,1], [0,-1]].map {|dx, dy|
+          [x + dx, y + dy]
+        }.reject {|x,y|
+          x.negative? || y.negative?
+        }.reject {|x,y|
+          maze[x,y]
+        }.reject {|pos|
+          seen.include?(pos)
+        }.each do |pos|
+          current << [pos, count + 1]
+        end
+
+        yield [pos, count]
+      end
+    end
+  end
+end
+
+if __FILE__ == $0
+  maze = Maze.new(1358)
+  p maze.solve([1,1]).walk.take_while {|pos,count| count < 51 }.map(&:first).uniq.size
+end
+
+require 'minitest'
+# require 'minitest/autorun'
+
+class TestMaze < Minitest::Test
+  def setup
+    @maze = Maze.new(10)
+  end
+
+  def test_maze
+    maze_s = <<-MAZE.chomp.split("\n").map(&:chars)
+.#.####.##
+..#..#...#
+#....##...
+###.#.###.
+.##..#..#.
+..##....#.
+#...##.###
+    MAZE
+    maze_s.each.with_index do |row, y|
+      row.each.with_index do |c, x|
+        assert_equal c, @maze[x,y] ??#:?.
+      end
+    end
+  end
+
+  def test_solve
+    assert_equal 11, @maze.solve([1,1], [7,4])
+  end
+end

2016/ruby/day_14.rb

@@ -0,0 +1,33 @@
+require 'digest/md5'
+
+class Keys
+  attr_reader :seed, :hash
+
+  def initialize(seed)
+    @seed = seed
+    @hash = Hash.new {|h,k|
+      hash = Digest::MD5.hexdigest("#{seed}#{k}")
+      2016.times do
+        hash = Digest::MD5.hexdigest(hash)
+      end
+      h[k] = hash
+    }
+  end
+
+  def each
+    return enum_for(__method__) unless block_given?
+
+    (0..Float::INFINITY).each do |index|
+      next unless /(.)\1\1/ =~ hash[index]
+
+      needle = $1 * 5
+      stream = (1..1000).map {|i| hash[index + i] }
+      next unless stream.any? {|h| h.include?(needle) }
+
+      yield [index, hash[index]]
+    end
+  end
+end
+
+keys = Keys.new('qzyelonm')
+p keys.each.take(64).last

2016/ruby/day_15.rb

@@ -0,0 +1,25 @@
+Disc = Struct.new(:positions, :start_position) do
+  def position_at(time)
+    (start_position + time) % positions
+  end
+end
+
+discs = DATA.each_line.map {|line|
+  /Disc #\d has (?<positions>\d+) positions; at time=0, it is at position (?<position>\d+)./ =~ line
+  Disc.new(positions.to_i, position.to_i)
+}
+discs << Disc.new(11, 0)
+
+p (0..Float::INFINITY).find {|t|
+  discs.each.with_index.all? {|disc, index|
+    disc.position_at(t + index) == 0
+  }
+}
+
+__END__
+Disc #1 has 17 positions; at time=0, it is at position 15.
+Disc #2 has 3 positions; at time=0, it is at position 2.
+Disc #3 has 19 positions; at time=0, it is at position 4.
+Disc #4 has 13 positions; at time=0, it is at position 2.
+Disc #5 has 7 positions; at time=0, it is at position 2.
+Disc #6 has 5 positions; at time=0, it is at position 0.

2016/ruby/day_16.rb

@@ -0,0 +1,24 @@
+def step(a)
+  b = a.reverse.tr('10', '01')
+  "#{a}0#{b}"
+end
+
+def checksum(data)
+  checksum = data.chars
+  loop do
+    checksum = checksum.each_slice(2).map {|a,b| (a == b) ??1:?0 }
+    break if checksum.length.odd?
+  end
+  checksum.join
+end
+
+seed = '10001110011110000'
+target_length = 35651584
+
+state = seed
+while state.length < target_length
+  state = step(state)
+end
+
+data = state[0...target_length]
+puts checksum(data)

2016/ruby/day_17.rb

@@ -0,0 +1,46 @@
+require 'digest/md5'
+
+State = Struct.new(:location, :path)
+
+Maze = Struct.new(:passcode, :size) do
+  def walk
+    return enum_for(__method__) unless block_given?
+
+    states = [State.new([0,0], '')]
+    until states.empty?
+      state = states.shift
+      yield state
+
+      next if state.location == [3,3]
+
+      hash = Digest::MD5.hexdigest("#{passcode}#{state.path}")[0,4]
+      open_doors = %i[ U D L R ].select.with_index {|_, index|
+        'bcdef'.include?(hash[index])
+      }
+
+      {
+        U: [ 0, -1],
+        D: [ 0,  1],
+        L: [-1,  0],
+        R: [ 1,  0],
+      }.select {|door, _|
+        open_doors.include?(door)
+      }.map {|door, (dx, dy)|
+        x = state.location[0] + dx
+        y = state.location[1] + dy
+
+        location = [x, y]
+        path = state.path + door.to_s
+        State.new(location, path)
+      }.select {|state|
+        state.location.all? {|i| (0...size).cover?(i) }
+      }.each do |state|
+        states << state
+      end
+    end
+  end
+end
+
+p Maze.new('yjjvjgan', 4).walk.select {|state|
+  state.location == [3, 3]
+}.map(&:path).map(&:length).max

2016/ruby/day_18.rb

@@ -0,0 +1,50 @@
+Row = Struct.new(:tiles) do
+  INPUT_MAP = { ?. => :safe, ?^ => :trap }
+
+  def self.from_s(input)
+    new(input.chars.map {|char| INPUT_MAP.fetch(char) })
+  end
+
+  def next
+    self.class.new(
+      %i[ safe safe ].insert(1, *tiles).each_cons(3).map {|l,c,r|
+        if l == :trap && c == :trap && r == :safe
+          :trap
+        elsif l == :safe && c == :trap && r == :trap
+          :trap
+        elsif l == :trap && c == :safe && r == :safe
+          :trap
+        elsif l == :safe && c == :safe && r == :trap
+          :trap
+        else
+          :safe
+        end
+      }
+    )
+  end
+end
+
+if __FILE__ == $0
+  row = Row.from_s(DATA.read.chomp)
+  count = 0
+  400_000.times do
+    count += row.tiles.count(:safe)
+    row = row.next
+  end
+  p count
+end
+
+require 'minitest'
+# require 'minitest/autorun'
+
+class TestRow < Minitest::Test
+  def test_row
+    row = Row.from_s('..^^.')
+    assert_equal %i[ safe safe trap trap safe ], row.tiles
+
+    assert_equal Row.from_s('.^^^^'), row.next
+  end
+end
+
+__END__
+^^.^..^.....^..^..^^...^^.^....^^^.^.^^....^.^^^...^^^^.^^^^.^..^^^^.^^.^.^.^.^.^^...^^..^^^..^.^^^^

2016/ruby/day_19.rb

@@ -0,0 +1,35 @@
+def solve(n, debug: false)
+  elves = Array.new(n) {|i| i+1 }
+
+  until elves.size == 1
+    across = elves.size / 2
+    elves.delete_at(across)
+    elves.rotate!
+  end
+
+  elves.first
+end
+
+# This takes too long
+# n = 3017957
+# puts solve(n)
+
+# So instead use this to find the pattern!
+(1..100).each do |i|
+  puts "#{i}: #{solve(i)}"
+end
+
+# At 3**n, the counter resets
+# At 2*3**n, the counter goes up by two instead of one
+include Math
+def formula(n)
+  x = log(n, 3).to_i
+  a = 3**x
+  b = 2*a
+
+  (n == a) ? a : n - a + [(n - b), 0].max
+end
+
+(1..100).each do |n|
+  puts "#{n}: #{solve(n)} #{formula(n)}"
+end

2016/ruby/day_20.rb

@@ -0,0 +1,14 @@
+blacklist = ARGF.read.split("\n").map {|line| Range.new(*line.split(?-).map(&:to_i)) }
+
+ip = 0
+count = 0
+until ip > 4294967295
+  range = blacklist.find {|range| range.cover?(ip) }
+  if range.nil?
+    count += 1
+    ip += 1
+  else
+    ip = range.end + 1
+  end
+end
+puts count

2016/ruby/day_21.rb

@@ -0,0 +1,48 @@
+INSTRUCTIONS = ARGF.read.split("\n")
+
+def scramble(input)
+  INSTRUCTIONS.each do |instruction|
+    case instruction
+    when /swap position (\d+) with position (\d+)/
+      x = $1.to_i
+      y = $2.to_i
+      input[x], input[y] = input[y], input[x]
+    when /swap letter (\w+) with letter (\w+)/
+      x = $1
+      y = $2
+      input.tr!("#{x}#{y}", "#{y}#{x}")
+    when /rotate (left|right) (\d+) steps?/
+      steps = $2.to_i
+      steps = -steps if $1 == 'right'
+      input = input.chars.rotate(steps).join
+    when /rotate based on position of letter (\w+)/
+      index = input.index($1)
+      index += 1 if index >= 4
+      index += 1
+      index = -index
+      input = input.chars.rotate(index).join
+    when /reverse positions (\d+) through (\d+)/
+      x = $1.to_i
+      y = $2.to_i
+      input[x..y] = input[x..y].reverse
+    when /move position (\d+) to position (\d+)/
+      x = $1.to_i
+      x = input[x]
+      input[x] = ''
+
+      y = $2.to_i
+      input.insert(y, x)
+    else
+      raise "invalid instruction: '#{instruction}'"
+    end
+  end
+  input
+end
+
+input = 'abcdefgh'.chars
+input.permutation.each do |candidate|
+  if scramble(candidate.join) == 'fbgdceah'
+    puts candidate.join
+    exit
+  end
+end

2016/ruby/day_22.rb

@@ -0,0 +1,10 @@
+Node = Struct.new(*%i[x y size used avail use])
+
+nodes = ARGF
+  .read
+  .scan(%r|/dev/grid/node-x(\d+)-y(\d+)\s+(\d+)T\s+(\d+)T\s+(\d+)T\s*(\d+)%|)
+  .map {|match| Node.new(*match.map(&:to_i)) }
+
+p nodes.permutation(2).count {|a,b|
+  a.used != 0 && a.used <= b.avail
+}

2016/ruby/day_23.rb

@@ -0,0 +1,81 @@
+registers = { ?a => 7, ?b => 0, ?c => 0, ?d => 0 }
+pc = 0
+data = DATA.each_line.map(&:chomp).to_a
+
+while pc < data.size
+  line = data[pc]
+  puts "#{registers}"
+  puts "#{pc}: #{line}"
+
+  case line
+  when /cpy ([a-d]|-?\d+) ([a-d])/
+    value = registers.fetch($1) { $1.to_i }
+    registers[$2] = value
+    pc += 1
+  when /inc ([a-d])/
+    registers[$1] += 1
+    pc += 1
+  when /dec ([a-d])/
+    registers[$1] -= 1
+    pc += 1
+  when /jnz ([a-d]|\d+) ([a-d]|-?\d+)/
+    value = registers.fetch($1) { $1.to_i }
+    count = registers.fetch($2) { $2.to_i }
+    pc += value.zero? ? 1 : count
+  when /tgl ([a-d]|-?\d+)/
+    value = registers.fetch($1) { $1.to_i }
+    line = data[pc + value]
+    if line.nil?
+      pc +=1
+      next
+    end
+
+    instruction, *args = line.split(/\s+/)
+
+    case args.size
+    when 1
+      instruction = (instruction == 'inc') ? 'dec' : 'inc'
+    when 2
+      instruction = (instruction == 'jnz') ? 'cpy' : 'jnz'
+    else
+      raise 'omg'
+    end
+
+    data[pc + value] = "#{instruction} #{args.join(' ')}"
+
+    pc += 1
+  else
+    puts "skipping line: #{line}"
+    pc += 1
+  end
+end
+
+p registers
+
+__END__
+cpy a b
+dec b
+cpy a d
+cpy 0 a
+cpy b c
+inc a
+dec c
+jnz c -2
+dec d
+jnz d -5
+dec b
+cpy b c
+cpy c d
+dec d
+inc c
+jnz d -2
+tgl c
+cpy -16 c
+jnz 1 c
+cpy 94 c
+jnz 82 d
+inc a
+inc d
+jnz d -2
+inc c
+jnz c -5

2016/ruby/day_24.rb

@@ -0,0 +1,136 @@
+class Solver
+  def initialize(maze)
+    @maze = maze
+  end
+
+  def solve(from, to)
+    seen = Set.new(from)
+    queue = [[from, 0]]
+    current = queue.shift
+
+    loop do
+      location = current[0]
+      break if location == to
+      if seen.include?(location)
+        current = queue.shift
+        next
+      end
+
+      seen << location
+
+      neighbors = maze
+        .open_neighbors(location[0], location[1])
+        .reject {|location| seen.include?(location) }
+
+      queue.concat(neighbors.map {|location| [location, current[1] + 1] })
+
+      return nil if queue.empty?
+      current = queue.shift
+    end
+
+    current[1]
+  end
+
+  private
+
+  attr_reader :maze
+end
+
+class Maze
+  attr_reader :locations
+
+  def initialize(input)
+    @maze = Hash.new
+    @locations = Hash.new
+
+    x, y = 0, 0
+    input.chars.each do |char|
+      case char
+      when /\d/
+        @locations[char.to_i] = [x,y]
+        char = ?.
+      when "\n"
+        x = -1
+        y += 1
+      else
+        # no-op
+      end
+
+      @maze[[x,y]] = char
+      x += 1
+    end
+  end
+
+  def [](x,y)
+    maze[[x,y]]
+  end
+
+  def open_neighbors(x, y)
+    [[-1,  0],
+     [ 1,  0],
+     [ 0, -1],
+     [ 0,  1]].map {|dx,dy|
+       [x+dx, y+dy]
+     }.select {|x,y|
+       self[x,y] == ?.
+     }
+  end
+
+  private
+
+  attr_reader :maze
+end
+
+if __FILE__ == $0
+  maze = Maze.new(ARGF.read)
+  solver = Solver.new(maze)
+
+  hash = maze.locations.to_a.combination(2).each.with_object({}) {|(a, b), hash|
+    steps = solver.solve(a[1], b[1])
+    hash[[a[0],b[0]]] = steps
+    hash[[b[0],a[0]]] = steps
+  }
+
+  p maze
+    .locations
+    .map(&:first)
+    .permutation
+    .select {|route| route[0] == 0 }
+    .map {|route| route + [0] }
+    .map {|route|
+      [route, route.each_cons(2).map {|a,b| hash[[a,b]] }.inject(:+)]
+    }.sort_by(&:last)
+    .first
+end
+
+require 'minitest'
+# require 'minitest/autorun'
+
+class TestMaze < Minitest::Test
+  def test_maze
+    maze = Maze.new(<<-MAZE)
+###########
+#0.1.....2#
+#.#######.#
+#4.......3#
+###########
+MAZE
+    assert_equal [1,1], maze.locations[0]
+
+    assert_equal [[2,1], [1,2]], maze.open_neighbors(1,1)
+  end
+end
+
+class TestSolver < Minitest::Test
+  def test_solver
+    maze = Maze.new(<<-MAZE)
+###########
+#0.1.....2#
+#.#######.#
+#4.......3#
+###########
+MAZE
+    solver = Solver.new(maze)
+    assert_equal 2, solver.solve(maze.locations[0], maze.locations[4])
+  end
+end

2016/ruby/day_25.rb

@@ -0,0 +1,43 @@
+class Assembunny
+  attr_reader :data
+
+  def initialize(data)
+    @data = data
+  end
+
+  def run(input)
+    return enum_for(__method__, input) unless block_given?
+
+    registers = { ?a => input, ?b => 0, ?c => 0, ?d => 0 }
+    pc = 0
+
+    while pc < data.size
+      line = data[pc]
+      case line
+      when /cpy ([a-d]|\d+) ([a-d])/
+        value = registers.fetch($1) { $1.to_i }
+        registers[$2] = value
+        pc += 1
+      when /inc ([a-d])/
+        registers[$1] += 1
+        pc += 1
+      when /dec ([a-d])/
+        registers[$1] -= 1
+        pc += 1
+      when /jnz ([a-d]|\d+) (-?\d+)/
+        value = registers.fetch($1) { $1.to_i }
+        pc += value.zero? ? 1 : $2.to_i
+      when /out ([a-d])/
+        yield registers.fetch($1)
+        pc += 1
+      else
+        raise "invalid line: #{line}"
+      end
+    end
+  end
+end
+
+assembunny = Assembunny.new(ARGF.read.split("\n"))
+
+needle = ('01' * 6).chars.map(&:to_i)
+puts (1..Float::INFINITY).find {|i| assembunny.run(i).take(12) == needle }

2016/rust/.gitignore

@@ -0,0 +1 @@
+target

2016/rust/Cargo.lock

@@ -0,0 +1,173 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "advent_of_code_2016"
+version = "0.1.0"
+dependencies = [
+ "error-chain",
+ "regex",
+ "rust-crypto",
+]
+
+[[package]]
+name = "aho-corasick"
+version = "0.7.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "backtrace"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f551bc2ddd53aea015d453ef0b635af89444afa5ed2405dd0b2062ad5d600d80"
+dependencies = [
+ "backtrace-sys",
+ "cfg-if",
+ "dbghelp-sys",
+ "kernel32-sys",
+ "libc",
+ "rustc-demangle",
+ "winapi",
+]
+
+[[package]]
+name = "backtrace-sys"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3602e8d8c43336088a8505fa55cae2b3884a9be29440863a11528a42f46f6bb7"
+dependencies = [
+ "gcc",
+ "libc",
+]
+
+[[package]]
+name = "cfg-if"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "de1e760d7b6535af4241fca8bd8adf68e2e7edacc6b29f5d399050c5e48cf88c"
+
+[[package]]
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2016/rust/Cargo.toml

@@ -0,0 +1,9 @@
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