diff --git a/2020/ruby/day_01.rb b/2020/ruby/day_01.rb
new file mode 100644
index 0000000..0bc9775
--- /dev/null
+++ b/2020/ruby/day_01.rb
@@ -0,0 +1,3 @@
+n = 3
+x = ARGF.read.split.map(&:to_i).combination(n).find {|x| x.sum == 2020 }
+p x.reduce(&:*)
diff --git a/2020/ruby/day_01.txt b/2020/ruby/day_01.txt
new file mode 100644
index 0000000..fa2560c
--- /dev/null
+++ b/2020/ruby/day_01.txt
@@ -0,0 +1,200 @@
+1567
+1223
+1758
+1842
+1933
+1898
+1409
+1058
+1533
+1417
+1032
+1634
+1477
+1394
+1888
+1972
+1237
+1390
+1677
+1546
+1302
+1070
+1369
+1455
+1065
+1924
+1593
+1131
+1064
+1346
+1914
+1129
+1830
+1450
+1278
+1740
+1809
+1176
+1734
+1102
+1807
+1982
+1603
+1736
+2008
+1980
+1905
+1633
+1732
+1350
+1865
+1988
+1805
+1998
+1152
+1046
+1870
+1557
+1789
+1766
+1945
+1359
+1002
+1126
+1719
+1497
+1296
+1560
+1936
+1929
+1464
+2005
+1281
+618
+1257
+1107
+1632
+1688
+1964
+1803
+1360
+1384
+1889
+1411
+1328
+1452
+1868
+1515
+1586
+1631
+1618
+1087
+1710
+1094
+1774
+1295
+1700
+1636
+1230
+1421
+1910
+1522
+1366
+1144
+1757
+1493
+1316
+1103
+687
+1371
+1720
+1155
+1559
+1900
+989
+1367
+1999
+1066
+1773
+1787
+1402
+1047
+1806
+1956
+1219
+1555
+1307
+1419
+1706
+1884
+1109
+1181
+2010
+1298
+1730
+1078
+1848
+1398
+1687
+2007
+1550
+1664
+1225
+1079
+1698
+350
+1222
+1377
+1977
+1510
+1571
+1630
+1029
+1379
+1942
+1949
+1249
+1829
+1297
+1530
+1607
+1324
+1069
+1476
+928
+1039
+1855
+1644
+1454
+1310
+1172
+547
+1034
+1878
+1479
+1457
+1319
+1810
+1759
+1439
+1851
+545
+1470
+2003
+1908
+1564
+1491
+1174
+1301
+1689
+1276
+1781
+1392
+1499
+1962
+1653
+1823
+1381
+1827
+1974
diff --git a/2020/ruby/day_02.rb b/2020/ruby/day_02.rb
new file mode 100644
index 0000000..2276a96
--- /dev/null
+++ b/2020/ruby/day_02.rb
@@ -0,0 +1,4 @@
+p ARGF.read.scan(/(\d+)-(\d+)\s*(\w):\s*(\w+)/)
+  .map {|a,b,c,d| [a.to_i, b.to_i, c, d] }
+  # .count {|min,max,char,pass| (min..max).cover?(pass.count(char)) }
+  .count {|p1,p2,char,pass| [pass[p1-1], pass[p2-1]].tally[char] == 1 }
diff --git a/2020/ruby/day_02.txt b/2020/ruby/day_02.txt
new file mode 100644
index 0000000..03eca38
--- /dev/null
+++ b/2020/ruby/day_02.txt
@@ -0,0 +1,1000 @@
+8-9 n: nnnnnnnnn
+14-15 d: dzjgbdwdkdhdddh
+16-17 m: mmmmmmmmmxmmmmwmm
+7-17 d: pmgdhpqbqdhshgtjt
+1-2 b: mvmgzbmfbrcnr
+16-17 c: cccccccccccqcccgcc
+1-6 x: ctqxsh
+1-5 l: lllvw
+9-10 k: kkkkkkklrsnk
+7-9 g: xsgzggbglgtm
+3-4 b: brwb
+4-5 x: xdxlfx
+5-6 c: cccccc
+4-7 v: vvvvvdpx
+2-7 s: qwdngzbtsntgzmxz
+6-8 s: ssssssssssss
+2-3 t: tjcttt
+2-4 z: nbgfl
+11-12 z: gnjzwzwzzwcbhv
+4-5 v: tvkfvnvvvvcv
+1-3 h: hhbhh
+15-16 g: gggggggggggggggv
+6-9 t: ftjztttfnztv
+2-5 v: vxpmqvvzvnglvvv
+2-4 r: rsxq
+3-4 k: kxkk
+2-3 k: kkkk
+3-6 t: ktttztt
+1-2 v: zvcvv
+14-16 b: bbbbbbbbbbbbbrbb
+7-10 b: sgmbgmxbxnpjgpthcbr
+5-13 r: wmfmgmxxwgbrpllfqnjj
+3-4 t: ftcd
+2-3 z: szzf
+1-6 j: cxjjbj
+2-3 t: ttvt
+2-6 h: hhkszjhjjxhqhrhn
+3-4 s: ssns
+4-8 x: xcjmwxxxlrqxxfx
+3-10 g: ggvggggkgrggggggxg
+2-6 z: lzmhmvftsvcjfhfw
+9-14 x: xxxxxxxxhxxxxxxxxx
+8-16 d: dddddddddfdddddtd
+1-2 g: wrhg
+2-7 r: krjrxmrrvhzrprr
+11-18 v: vvwvdwslcxvtkzvvkr
+9-10 m: mmmxfmmmmmmmmmmz
+7-12 g: ggktlgggsqpgw
+6-8 t: tttttbtpz
+8-18 h: nfhhwkthhxhhcshhwh
+10-16 c: smnclksccmnmcmzcc
+14-15 f: nmndkphffnqmffj
+4-10 f: ffcwqvfffffvfg
+6-13 v: vvnvvcvxwxfvvvvvvvv
+1-4 k: qklkkkspwkxfk
+7-9 w: wwwwwwwwk
+9-10 c: ccccccccbpc
+11-14 r: qrxrjbbtrxrrrr
+2-5 j: wckjjdjjjzvhsqr
+10-12 x: xxxxxxxxxcxxx
+3-8 l: vnlslkhlwdd
+4-12 n: nxnfnqnnzmngnn
+4-5 z: zzgpzzc
+4-5 z: zgmtbz
+2-3 v: vkvv
+11-12 q: mqrqmlfqqqqlq
+6-14 g: lggzggfxggsggqggxg
+3-8 q: sqzqrbgvzp
+6-7 l: lllklll
+5-7 c: czrccvcclm
+11-17 r: rrwrrrrrrdrrrrrrbrrr
+2-4 x: xsxx
+3-9 l: llllllllwl
+3-19 c: ccccccccjccccvczcccc
+5-6 h: zhvhhhhghb
+1-3 t: ttttvttwt
+1-5 p: ppppppp
+3-4 g: ssvgr
+5-6 t: ndjbtttnmf
+14-16 f: fwptdqwwpztqhfnswts
+1-2 h: ffvmvbhmh
+2-3 f: gdrz
+1-2 l: slll
+3-5 w: zwwwrwwwwwwww
+1-3 w: fszt
+8-9 j: jjjjjjjjrj
+4-9 k: kkkskkkkkkk
+4-9 p: sppzppqpplpp
+2-9 s: ssvxrrjhs
+11-14 v: cvvvvvvvkvvvvvmv
+1-10 q: qqqcmqfjqs
+3-7 z: sgzzfzkzz
+5-8 w: wwwwhwrztw
+3-10 p: phbbmpzhpppspdfr
+2-8 c: cscpcccg
+2-4 r: rsvr
+14-16 h: hhhhhhhhhhhhhhhh
+1-13 j: jjjjjjjjhjxjxjjjj
+7-8 v: vvvvvvvvv
+4-8 r: vbhlmwrrvmkrwn
+3-4 c: ccdc
+3-5 h: hbjxx
+3-4 q: qqdqq
+10-14 k: dkkwnrkkhkwzhkkkk
+1-3 z: zzzzzzm
+3-7 t: tbtxfttvw
+6-18 n: qntgnnnztkhwtnjrnm
+4-5 g: gggrng
+2-7 c: bclzgcgq
+1-8 j: jbjjjjjj
+2-3 x: jxxfbtxskxc
+5-7 g: kgszqgcgxgqtppgb
+1-6 l: llllltll
+3-4 g: brgm
+12-16 x: xsxxxxqpxxvxmxjxxx
+6-7 k: kkkkkkk
+3-9 f: fftbvjfvfffstzfff
+14-15 r: khlwrfrcnrkddrh
+2-4 h: hwhqm
+4-5 z: zzzzd
+7-10 b: bbbbbbpbbt
+8-10 h: hhhhhhhdhn
+5-6 c: bccclt
+7-11 p: pppppppppppp
+4-6 r: rwrrrrrr
+9-17 m: mmmmmmmmmmmmmmmmmmm
+3-9 n: nnnfnnnnjnn
+3-4 q: rqqcq
+1-2 z: mbzz
+1-6 h: hhhhhs
+10-11 h: whhhrvtghhh
+5-6 g: ggggjz
+5-8 g: gggbgggvg
+15-16 v: vvvvvvvvvvvrvvtv
+5-7 q: qwrzqbllqqqrgkqnlsr
+2-4 c: ccccc
+7-14 p: spppxpppphblprm
+4-9 j: qzxlxdzsdlnlhw
+2-4 l: lzphl
+16-17 g: ggggggsgggggggxpqggs
+3-17 d: ddddddddddddldddcddd
+10-12 n: qtkgqxknvjnnsbnrwtp
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+7-16 v: wkntvjdvvwvfvnqvm
+2-5 w: vwhjw
+2-3 f: dmgff
+2-5 p: nklmmzp
+4-5 x: vxxxxd
+1-2 m: mmmqm
+9-12 r: rrrrrrrrqrrm
+6-9 r: ldvhvrjdkqhmr
+2-9 f: fmkffptffzdgk
+5-12 x: xxxxxxxxxxxbxxxxx
+3-4 w: bwwqgwt
+10-11 f: fffffffffhfff
+10-13 n: nnfnmnhnnnnnmn
+12-13 n: nnnnnnnnnnnnnn
+8-13 z: rzzfbzzdrzlkn
+13-14 p: qgkxppfppfjcnx
+3-4 z: bcxdctzg
+3-9 z: zznzwzzmffqxj
+1-2 n: nnnznr
+2-6 s: mtspsskswf
+2-15 g: ggggggggggggggqg
+3-8 x: tzxqfjrkpdgkxptbxm
+15-19 v: dvcvvvvvvvvvlvqvvvv
+4-9 r: dszrbrbzrwlfxpcrkn
+6-7 f: fffffsmf
+5-8 v: vdvvvvrv
+10-11 m: mmmmrmmmmmhmmm
+9-12 s: stwssszcsssr
+8-15 j: jjbjjjjjjjjjjhj
+6-8 v: vvvvvhvv
+1-7 w: ghxwddwwbfchvtff
+6-9 v: vvtxxrbqpvdvvv
+3-5 q: fqfqrskl
+15-17 k: kkkkzkkkkvbkkksrlkkk
+2-18 w: rtfwsrwcbpwtwjzmwwws
+5-7 f: pfshgsnff
+8-20 h: jkkhhhssfppkjqdfdhtp
+2-7 b: bblqbfhbbbb
+3-6 j: wjmjjxjj
+4-13 d: dfzdkqpddgchbhtgg
+4-7 x: xxxxtsn
+5-6 m: mmmmmmtm
+4-5 p: pkmppck
+1-14 j: jpjjwjjkjjmxkjwqj
+3-4 s: qxsfvs
+8-9 k: kkkwkzxrvkkkk
+13-15 r: qzrzrrbrxrcrzjpr
+1-4 l: lmvlj
+1-4 l: mrll
+11-15 w: wqwwwnwwwwtwwfwwjww
+8-9 g: fggzsggmggggccm
+2-5 f: vggqfcffxh
+2-4 c: cwcccr
+11-12 c: ccccccccccfc
+3-5 g: ggmggg
+10-11 l: llllllllrll
+5-6 v: wvdjvv
+6-7 p: ppppphkp
+7-10 c: tcccccnccjcccc
+8-10 m: mmmrmmlgmt
+3-14 j: ljsjjjjtjjjjjhj
+10-16 c: kcjcccccccccnvtccccc
+1-9 n: tnjnnnnnnnn
+3-7 h: mhdpxhhh
+15-16 c: ccccccgcccccccgcc
+6-8 t: tvkddtrt
+3-4 k: fkhjk
+9-11 v: bqmhnjvpvxr
+7-9 x: xxxxxxsxpx
+16-17 h: hgjzqhvqhsgcplwmhvth
+16-17 p: ppppppppppppppkqvp
+8-11 l: lllllzlbclslt
+4-18 k: kkkkkbkkkkkqkkkkkks
+1-8 b: cxbvpxbzbsz
+1-12 f: ffffffffffffffff
+13-19 d: ddddddddddddkddddddd
+9-11 v: mtvvvvvvhvgvv
+10-11 t: tttttttttdtttt
+5-9 g: gglgggpgdlgtcqg
+7-10 m: mzmmmmmmrn
+5-6 q: qqqqsq
+8-11 f: ffrcfbfnwffzfpxfbvf
+7-10 f: ffvfffxbpfffmjfqb
+2-3 r: rrrr
+6-7 x: bxxxxxgj
+3-5 j: jljndr
+4-14 q: qqqzqqqqqqpqqdqqqqqq
+3-6 n: nnnnntnnn
+15-16 g: ggggggggggggghggg
+13-16 x: jxxzqxvxfhxxvggxdqx
+4-6 f: zfxfkfhmsfgjf
+9-12 r: rrrrrrrrgrrnrrrrv
+3-7 w: wczsqxwdw
+9-12 k: hxgkkklkkkkwkkk
+1-4 s: sssns
+5-6 v: vvdvlv
+12-14 g: gsgggggggggggkgg
+5-16 r: rlkqflvvtfcdckfrn
+18-19 c: cfncccccccccccccclzc
+4-8 n: nbntnnnvnnnnnn
+3-6 l: jfpxllfrbll
+4-14 k: xphrkstmqmqhkw
+2-10 b: rrsrbbqvbr
+5-7 k: wkbgkkkqfkkkk
+5-6 k: kkkkkkk
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+2-15 h: hhhhhhhhhhhhhhh
+5-12 p: pppjpvgppppppppprv
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+5-7 t: xwtzttvctqtpvbltpbtt
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+12-14 k: rkkqvkfngkkqjn
+3-7 n: mtxnkbnw
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+3-4 m: mmmq
+2-7 s: ssssskcnssgnkzd
+3-4 g: rmgrggd
+2-3 h: grhrtpcch
+2-6 d: dddddddv
+3-7 g: jggggggggrfggggg
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+3-5 h: dwhwv
+2-7 n: ttxgbdbwnnnvnnx
+2-4 c: cctfcsb
+16-17 c: ccccccccgcxckccxccc
+5-6 x: xxxxxx
+2-6 p: pwndpfrpppppppppppkp
+1-4 h: zhhjlh
+2-5 p: prpxwppljppvwjtppkp
+2-6 j: bjjjjjjf
+16-20 p: pmppppbpppppppppsdpn
+1-3 b: bbbh
+8-11 k: nkxskkbkfjvcjkdcgrk
+7-12 c: cqcdcccgchnd
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+4-12 j: kjdjjvrjxsjw
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+1-12 m: mmmmmmmmmmmmmmmmzmm
+1-2 s: sssws
+1-5 x: xrtxs
+3-4 w: wvwv
+6-7 s: sssssss
+11-12 m: lbwtvjjmmggm
+16-17 l: llllllllllllwllht
+11-13 t: qtttttgtttttdmt
+2-5 r: ldgrf
+13-18 r: rrrrrrrrrrrrrrrprr
+12-19 l: lnfnhllrjgcllhjlczl
+6-7 c: clccccv
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+4-6 s: sjssvxdx
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+2-3 s: ssss
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+4-6 d: drdvdd
+4-8 v: xgwkxvfq
+1-5 t: zttttttttqmtt
+5-8 c: ccjccccqc
+9-18 z: zzzzzzzzzzzzzzzmsgzz
+1-4 q: qqqkq
+10-11 w: wwwwwwwwwwww
+5-9 r: prtdrksjbmzmrq
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+6-13 c: cztfcwpjcczsc
+3-4 r: rrrg
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+2-3 c: cmkc
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+7-8 d: jddddddd
+1-9 s: lsssssssmss
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+5-9 t: ttzstqtmt
+7-11 x: xxxwxxxxkxxxxgfxxx
+2-3 s: dssjzpsxjr
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+3-4 f: ffxff
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+1-3 z: zzrd
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+3-7 l: lkllvqplww
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+1-9 z: zzzzzzzzzz
+8-10 q: wqhcwqdqqq
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+3-5 v: rfvvv
+15-17 n: snmnnnnnwnnnnnnnnnn
+4-12 q: sqqqhwnbqqxqbvfrk
+4-6 l: lllllvl
+17-18 c: cccccccccccccccccc
+1-12 t: gttttttxnttzttt
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+7-14 f: ffffffcjffcfjfff
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