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|
solids = []
$stdin.readlines.map { |line|
line.strip.split(' -> ').map {
|coord| coord.split(?,).map(&:to_i)
}
}.each { |path|
(path.length - 1).times { |i|
if path[i][0] == path[i+1][0]
x = path[i][0]
y1 = path[i][1]
y2 = path[i+1][1]
if y1 > y2
t = y2
y2 = y1
y1 = t
end
(y1..y2).each { |y| solids << [x, y] }
else
x1 = path[i][0]
x2 = path[i+1][0]
if x1 > x2
t = x2
x2 = x1
x1 = t
end
y = path[i][1]
(x1..x2).each { |x| solids << [x, y] }
end
}
}
solids.uniq!
floor = solids.map{ |_, y| y }.max + 1
sands = 0
loop do
puts sands
sand = [500, 0]
loop do
if sand[1] == floor
break
else
if solids.include?([sand[0], sand[1] + 1])
if solids.include?([sand[0] - 1, sand[1] + 1])
if solids.include?([sand[0] + 1, sand[1] + 1])
break
else
sand = [sand[0] + 1, sand[1] + 1]
end
else
sand = [sand[0] - 1, sand[1] + 1]
end
else
sand = [sand[0], sand[1] + 1]
end
end
end
solids << sand
sands += 1
break if sand == [500, 0]
end
puts sands
|
