[2022][ruby][14.x]

pull/1/head
Alpha Chen 1 year ago
parent c5846c52e9
commit adff292d00
Signed by: alpha
SSH Key Fingerprint: SHA256:3fOT8fiYQG/aK9ntivV3Bqtg8AYQ7q4nV6ZgihOA20g

@ -0,0 +1,62 @@
scan = ARGF.read.lines(chomp: true)
cave = scan.each.with_object({}) {|line, cave|
line.split(" -> ")
.map { _1.split(?,).map(&:to_i) }
.each_cons(2) {|(ax,ay),(bx,by)|
Range.new(*[ax, bx].sort).each do |x|
Range.new(*[ay, by].sort).each do |y|
cave[[x, y]] = ?#
end
end
}
}
x_min, x_max = cave.keys.map(&:first).minmax
y_min, y_max = cave.keys.map(&:last).minmax
inspect_cave = -> {
puts (0..y_max+1).map {|y|
(x_min-1..x_max+1).map {|x|
cave[[x, y]] || ?.
}.join
}.join("\n")
}
# part one
# sands = 0
# loop do
# inspect_cave.()
# sands += 1
# pos = [500, 0]
# while next_pos = [0, -1, 1].map {|dx| pos.zip([dx, 1]).map { _1 + _2 }}.find { cave[_1].nil? }
# pos = next_pos
# break if pos[1] >= y_max
# end
# break if pos[1] >= y_max
# cave[pos] = ?o
# end
# inspect_cave.()
# p sands-1
# part two
cave.default_proc = ->(h,(x,y)) { h[[x, y]] = y == y_max + 2 ? ?# : nil }
sands = 0
loop do
# inspect_cave.()
sands += 1
pos = [500, 0]
while next_pos = [0, -1, 1].map {|dx| pos.zip([dx, 1]).map { _1 + _2 }}.find { cave[_1].nil? }
pos = next_pos
end
break if pos == [500, 0]
cave[pos] = ?o
end
inspect_cave.()
p sands
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