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adventofcode

Code used to solve https://adventofcode.com/, one branch per year git clone https://hacktivis.me/git/adventofcode.git

day3.0.ha (1262B)

    

  1. // SPDX-FileCopyrightText: 2022 Haelwenn (lanodan) Monnier <contact+adventofcode@hacktivis.me>
  2. // SPDX-License-Identifier: BSD-3-Clause
  4. use bufio;
  5. use os;
  6. use io;
  7. use fmt;
  8. use strings;
  9. use ascii;
  11. export fn main() void = {
  12. 	let scores: []u32 = [];
  14. 	for(true) {
  15. 		let line = match(bufio::scanline(os::stdin)) {
  16. 		case let l: []u8 =>
  17. 			yield l;
  18. 		case io::EOF =>
  19. 			break;
  20. 		case let e: io::error =>
  21. 			fmt::fatal("day3.0: {}", io::strerror(e));
  22. 		};
  24. 		let line = strings::fromutf8(line);
  26. 		let head = strings::sub(line, 0, len(line)/2);
  27. 		let tail = strings::sub(line, len(line)/2, strings::end);
  29. 		let i = strings::iter(head);
  30. 		let common = ' ': rune;
  31. 		for(true) {
  32. 			let dup = match(strings::next(&i)) {
  33. 			case let r: rune => yield r;
  34. 			case void => break;
  35. 			};
  37. 			if(strings::contains(tail, dup)) {
  38. 				common = dup;
  39. 				break;
  40. 			};
  41. 		};
  43. 		let score = if(ascii::islower(common)) {
  44. 			yield (common: u32)-('a': u32)+1;
  45. 		} else {
  46. 			yield (common: u32)-('A': u32)+27;
  47. 		};
  49. 		let common = strings::fromrunes([common]);
  51. 		fmt::printfln("{} | {} -> {}, {}", head, tail, common, score)!;
  53. 		append(scores, score);
  54. 	};
  56. 	let final = 0u32;
  57. 	for(let i = 0z; i < len(scores); i += 1) {
  58. 		final += scores[i];
  59. 	};
  61. 	fmt::printfln("Score: {}", final)!;
  62. };