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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| #!/usr/bin/env ruby | ||
| # frozen_string_literal: true | ||
|
|
||
| def count_trees(xd, yd=1) | ||
| in_f = ARGV.first ? File.open(ARGV.first) : ARGF | ||
| n_trees = in_f.readlines.drop(1).reduce([xd, 1, 0]) do |(xpos, ypos, n_trees), line| | ||
| if (ypos % yd).zero? | ||
| x_repeat = line.strip.length | ||
| tree_found = line.strip[xpos % x_repeat] == '#' | ||
| [xpos + xd, ypos + 1, n_trees + (tree_found ? 1 : 0)] | ||
| else | ||
| [xpos, ypos + 1, n_trees] | ||
| end | ||
| end[2] | ||
| in_f.rewind | ||
| n_trees | ||
| end | ||
|
|
||
| # 1 | ||
| puts(count_trees(3)) | ||
|
|
||
| # 2 | ||
| puts([[1], [3], [5], [7], [1, 2]].reduce(1) { |r, n| count_trees(*n) * r }) |
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| @@ -0,0 +1,323 @@ | ||
| .........#..##.##.............. | ||
| #...#.#..#..................... | ||
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| #.....#..#.....#..#...#.......# | ||
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| .##..#..#..##....##...#........ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,11 @@ | ||
| ..##....... | ||
| #...#...#.. | ||
| .#....#..#. | ||
| ..#.#...#.# | ||
| .#...##..#. | ||
| ..#.##..... | ||
| .#.#.#....# | ||
| .#........# | ||
| #.##...#... | ||
| #...##....# | ||
| .#..#...#.# |