Add updated solutions, including day 20.
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parent
77c91f8386
commit
32895b3e17
27
day15.cr
27
day15.cr
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@ -2,27 +2,14 @@ require "advent"
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INPUT = input(2020, 15).split(",").map(&.to_i32)
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def run(input, times)
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ls = {} of Int32 => {Int32,Int32}
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last = 0
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input.each_with_index do |n, i|
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ls[n] ||= {-1,-1}
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f,s = ls[n]
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ls[n] = {i,f}
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last = n
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ls = {} of Int32 => Int32
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temp = 0
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(times-1).times do |i|
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n = input[i]? || temp
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temp = i - (ls[n]? || i)
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ls[n] = i
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end
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count = input.size
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while count < times
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n = 0
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if ls[last][1] != -1
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n = ls[last][0] - ls[last][1]
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end
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last = n
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ls[n] ||= {-1,-1}
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f,s = ls[n]
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ls[n] = {count,f}
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count += 1
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end
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last
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return temp
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end
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def part1(input)
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51
day17.cr
51
day17.cr
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@ -1,46 +1,47 @@
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require "advent"
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require "benchmark"
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INPUT = input(2020, 17).lines.map(&.chars)
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def part1(input)
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def solve(input, dim)
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step = input.clone
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cubes = Set({Int32,Int32,Int32,Int32}).new
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new_cubes = Set({Int32,Int32,Int32,Int32}).new
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cubes = Set(Array(Int32)).new
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new_cubes = Set(Array(Int32)).new
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input.each_with_index do |row, y|
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row.each_with_index do |c, x|
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cubes << {x,y,0,0} if c == '#'
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cubes << [x,y].concat([0] * (dim-2)) if c == '#'
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end
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end
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6.times do |i|
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neighbor_count = {} of {Int32,Int32,Int32,Int32} => Int32
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cubes.each do |c|
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x,y,z,w = c
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(-1..1).each do |dx|
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(-1..1).each do |dy|
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(-1..1).each do |dz|
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(-1..1).each do |dw|
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next if dx == 0 && dy == 0 && dz == 0 && dw == 0
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neighbor_count[{x+dx,y+dy,z+dz,w+dw}] = (neighbor_count[{x+dx,y+dy,z+dz,w+dw}]? || 0) + 1
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end
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end
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end
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8.times do |i|
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print '.'
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neighbor_count = Hash(Array(Int32), Int32).new(0)
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Array.product([[-1,0,1]] * dim).each do |diff|
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next if diff.all? &.==(0)
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cubes.each do |c|
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neighbor_count[c.zip_with(diff) { |a,b| a+b }] += 1
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end
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end
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new_cubes.clear
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neighbor_count.each do |n, i|
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if cubes.includes?(n)
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new_cubes << n if (i == 2 || i == 3)
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elsif i == 3
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new_cubes << n
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end
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new_cubes << n if i == 3 || (cubes.includes?(n) && i == 2)
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end
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new_cubes, cubes = cubes, new_cubes
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end
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cubes.size
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end
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def part2(input)
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def part1(input)
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solve(input, 3)
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end
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puts part1(INPUT.clone)
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puts part2(INPUT.clone)
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def part2(input)
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solve(input, 4)
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end
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(3..).each do |i|
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print "Dim #{i} "
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bm = Benchmark.measure { puts " #{solve(INPUT, i)}" }
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puts bm.real * 1000
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end
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54
day18.cr
Normal file
54
day18.cr
Normal file
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@ -0,0 +1,54 @@
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require "advent"
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INPUT = input(2020, 18).lines
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class Array(T)
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def push_op(op)
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r = pop
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l = pop
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self << ((op == '*') ? (l*r) : (l+r))
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end
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def has_op?
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!empty? && last != '('
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end
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end
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def translate(toks, prec)
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output = [] of Int64
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stack = [] of Char
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toks.each do |tok|
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case tok
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when .number? then output << tok.to_i64
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when '(' then stack << '('
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when ')'
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while stack.has_op?
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output.push_op(stack.pop)
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end
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stack.pop
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else
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while stack.has_op? && prec[stack.last] < prec[tok]
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output.push_op(stack.pop)
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end
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stack << tok
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end
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end
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while stack.has_op?
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output.push_op(stack.pop)
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end
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output.last
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end
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def part1(input)
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input.sum do |line|
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translate(line.chars.reject &.==(' '), {'*' => 0, '+' => 0})
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end
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end
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def part2(input)
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input.sum do |line|
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translate(line.chars.reject &.==(' '), {'*' => 1, '+' => 0})
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end
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end
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puts part1(INPUT.clone)
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puts part2(INPUT.clone)
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68
day19.cr
Normal file
68
day19.cr
Normal file
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@ -0,0 +1,68 @@
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require "advent"
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rlines, _, strings = input(2020, 19).partition("\n\n")
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strings = strings.lines
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rules = {} of String => String
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rlines.lines.map do |l|
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rule, _, text = l.partition(": ")
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rules[rule] = text
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end
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alias Matcher = Proc(String,Int32,Array(Int32))
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def char(c)
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->(str : String, i : Int32) { str[i]? == c ? [i+1] : [] of Int32 }
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end
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def any(ps)
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->(str : String, i : Int32) { ps.flat_map { |p| p.call(str, i) } }
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end
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def seq(ps)
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->(str : String, i : Int32) {
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base = [i]
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ps.each do |p|
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base = base.flat_map { |i| p.call(str, i) }
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end
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base
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}
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end
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def to_regex(rules, rule)
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end
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def build_rule(rules, built, rule) : Matcher
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if exists = built[rule]?
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return exists
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end
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body = rules[rule]
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return built[rule] = char body[1] if body.matches? /"."/
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branches = [] of Matcher
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top = any(branches)
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built[rule] = top
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branches.concat(body.split(" | ").map { |b| seq(b.split(" ").map { |subrule| build_rule(rules, built, subrule) }) })
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top
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end
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def part1(input)
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rules, lines = input
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matcher = build_rule(rules, {} of String => Matcher, "0")
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lines.count do |l|
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matcher.call(l, 0).includes? l.size
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end
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end
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def part2(input)
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rules, lines = input
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rules["8"] = "42 | 42 8"
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rules["11"] = "42 31 | 42 11 31"
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matcher = build_rule(rules, {} of String => Matcher, "0")
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lines.count do |l|
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matcher.call(l, 0).includes? l.size
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end
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end
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puts part1({rules,strings})
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puts part2({rules,strings})
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166
day20.cr
Normal file
166
day20.cr
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@ -0,0 +1,166 @@
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require "advent"
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tiles = input(2020, 20).split "\n\n"
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tiles.pop
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thash = {} of Int32 => Array(Array(Char))
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tiles = tiles.map do |t|
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tl = t.lines
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tid = tl[0].match(/Tile (\d+):/).not_nil![1].to_i32
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tls = tl[1..]
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thash[tid] = tls.map &.chars
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end
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class Array(T)
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def matches?(other)
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zip_with(other) { |l,r| l == r }.all?
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end
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def rotate
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reverse.transpose
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end
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end
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def check(side_a, side_b)
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return :normal if side_a.matches?(side_b)
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return :flip if side_a.matches?(side_b.reverse)
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return nil
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end
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def check_all(side_a, other, other_t)
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check(side_a, other.first) || check(side_a, other.last) || check(side_a, other_t.first) || check(side_a, other_t.last)
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end
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MONSTER = [ {0, 1}, {1, 0}, {4, 0}, {5, 1}, {6, 1}, {7, 0}, {10, 0}, {11,1}, {12, 1}, {13, 0}, {16, 0},
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{17, 1}, {18, 1}, {18, 2}, {19, 1} ]
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def stitch(m, thash, corner)
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image = Array(Array(Char)).new(12*8) do |y|
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Array(Char).new(12*8) do |x|
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'.'
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end
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end
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tile = thash[corner]
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tile_id = corner
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tile.reverse! if m[corner].has_key? :top
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tile.each &.reverse! if m[corner].has_key? :left
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12.times do |row|
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tile = tile.not_nil!
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row_tile = tile
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row_id = tile_id
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12.times do |col|
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row_tile = row_tile.not_nil!
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(0..7).each do |y|
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(0..7).each do |x|
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image[col*8+y][row*8+x] = row_tile[y+1][x+1]
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end
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end
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matches = nil
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thash.each do |other_id, other_tile|
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next if matches
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next if other_id == row_id
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4.times do
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if row_tile.last.matches? other_tile.first
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row_id = other_id
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matches = other_tile
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elsif row_tile.last.matches? other_tile.first.reverse
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row_id = other_id
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matches = other_tile.map &.reverse
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end
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other_tile = other_tile.rotate
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end
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end
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row_tile = matches
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end
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rot = tile.rotate
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matches = nil
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thash.each do |other_id, other_tile|
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next if matches
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next if other_id == tile_id
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4.times do
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if rot.last.matches? other_tile.first
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tile_id = other_id
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matches = other_tile.rotate.rotate.rotate
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elsif rot.last.matches? other_tile.first.reverse
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tile_id = other_id
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matches = other_tile.map(&.reverse).rotate.rotate.rotate
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end
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other_tile = other_tile.rotate
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end
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end
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tile = matches
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end
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image
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end
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def find_dragons(stitch)
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dragons = [] of {Int32,Int32}
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stitch.each_with_index do |row, y|
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row.each_with_index do |c, x|
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is_dragon = MONSTER.all? do |dx, dy|
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(stitch[y+dy]?.try &.[x+dx]?) == '#'
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end
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dragons << {x,y} if is_dragon
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end
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end
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dragons
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end
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def find_all_dragons(stitch)
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dragons = [] of {Int32,Int32}
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4.times do
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dragons.concat find_dragons(stitch)
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dragons.concat find_dragons(stitch.reverse)
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stitch = stitch.rotate
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end
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dragons
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end
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def match(thash, tile)
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matches = {} of Symbol => {Int32, Symbol}
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cs = thash[tile]
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tcs = cs.transpose
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thash.each do |t, ocs|
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next if t == tile
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tocs = ocs.transpose
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top = check_all(cs.first, ocs, tocs)
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bottom = check_all(cs.last, ocs, tocs)
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left = check_all(tcs.first, ocs, tocs)
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right = check_all(tcs.last, ocs, tocs)
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matches[:top] = {t, top} if top
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matches[:left] = {t, left} if left
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matches[:bottom] = {t, bottom} if bottom
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matches[:right] = {t, right} if right
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end
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matches
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end
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def part1(input)
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corners = input.select do |t, i|
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match(input, t).size == 2
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end
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corners.keys.map(&.to_i64).product
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end
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def part2(input)
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matches = {} of Int32 => Hash(Symbol, {Int32, Symbol})
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corners = input.select do |t, i|
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matches[t] = match(input, t)
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match(input, t).size == 2
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end
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stitched = stitch(matches, input, corners.first[0])
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dragons = find_all_dragons(stitched)
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stitched.sum(&.count(&.==('#'))) - (dragons.size * MONSTER.size)
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end
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puts part1(thash.clone)
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puts part2(thash.clone)
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