diff options
| -rw-r--r-- | 2020/day3.raku | 57 | ||||
| -rw-r--r-- | 2020/day3.txt | 323 |
2 files changed, 380 insertions, 0 deletions
diff --git a/2020/day3.raku b/2020/day3.raku new file mode 100644 index 0000000..9189a4e --- /dev/null +++ b/2020/day3.raku @@ -0,0 +1,57 @@ +#!/usr/bin/env raku + +use v6; + +constant \EXAMPLE = q:to/END/; +..##....... +#...#...#.. +.#....#..#. +..#.#...#.# +.#...##..#. +..#.##..... +.#.#.#....# +.#........# +#.##...#... +#...##....# +.#..#...#.# +END + +sub solve($input, Int $step-right, Int $step-down --> Int) { + # Parse it + my @m = $input.split("\n").grep(*.chars > 0).map(*.comb.Array); + my $x = 0; + my $y = 0; + my $trees = 0; + my $width = @m[0].elems; + + while $y < @m.elems { + $trees++ if @m[$y][$x] eq '#'; + + $y += $step-down; + $x = ($x + $step-right) % $width; + } + $trees +} + +multi sub MAIN('part1', $file) { + say solve(slurp($file), 3, 1); +} + +multi sub MAIN('part2', $file) { + my $input = slurp $file; + my &f = &solve.assuming($input); + say ( + f(1, 1), + f(3, 1), + f(5, 1), + f(7, 1), + f(1, 2) + ).reduce: &[*] +} + +multi sub MAIN('test') { + use Test; + subtest 'Part 1', { + is solve(EXAMPLE, 3, 1), 7, 'Example'; + } +} diff --git a/2020/day3.txt b/2020/day3.txt new file mode 100644 index 0000000..2d49b8b --- /dev/null +++ b/2020/day3.txt @@ -0,0 +1,323 @@ +.#....#..##.#..####....#....... +......#..#....#....###......#.# +#..#.....#..............##.#.#. +#.#...#....#...#......##..#..#. +...#..#.##..#..#........###.#.# +...#.#..........#.........##... +...#.#....#.#....#..#......#... +..##.#.....#.......#.###..#..## +..#.......#.......#....##...... +....##........##.##...#.###.##. +#.......#.......##..#......#... +..##.............##.#......#... +...#.####....#.....#...##...... +.............##.#......#....... +..#...#....#......#....#....... +..#....#..#............#....... +##...#..#........##..#......#.. +##........##........#.#.......# +#.......#........#.#..#....###. +.....#..#.#..........##...#.... +..##...#......#.#...#..#...#... +##.##...#......#....#....#...#. +#.......#..#.#..#....#..###.#.# +#.............#.#....#..#.#.... +...#.......###.#.##.##.#...#..# +.##.......##..##...#..###...... +.......#.#.#.#..####..#..#..#.. +...##......#.#.##.###....#.###. +###......###......#.#####..#... +..#........##..#..##.##..#...#. +.....##..#...#..#.##.....#.#... +#......#.##....#..##.#....#.#.. +##.#.##..#................#.... +......#.#....#......##.....#... +..#...##..#..#...#..#.#..#..... +........#.#.#.##...#.#.....#.#. +#.#......#.....##..#...#....... +..#.#......#...........###..... +......##....#....##..#..#.#.#.# +##....#.###...#......#..#...#.. +#.#.##....###...####.......#..# +##...........#.....#........#.# +.##.#..#.....#......#.......#.. +##..##..###....#.........##.... +..#..#..#.##...#.#...#........# +#.##.###...#.......#........... +.........#.................#... +#.##...#.....#..##........#.... +....#.#...##...#...........#... +.#.....#.#..#...##..##.....#... +.#.....####....#..##..#........ +...#..#......##.#..##.#.#.#..#. +.##.#.....#.....#...#.......##. +......#..#..#......#...####.... 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