Add solution for day24a
Created by voroskoi on July 15, 2022
5LL6UWH2IEMYPS36SPTBOBLGOVYLPCNQ7PJYA5SQIRE6YPOVOZ7AC Dependencies
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File addition: day24.txt
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addition: day24.zig
[2.15]const std = @import("std");const PATH = "input/day24.txt";const Str = []const u8;pub fn first(allocator: ?std.mem.Allocator) anyerror!usize {var tf = TileFloor{.floor = std.AutoHashMap(Coord, void).init(allocator.?),};defer tf.floor.deinit();var lines = std.mem.tokenize(u8, @embedFile(PATH), "\n");while (lines.next()) |line| {const target = parseInstruction(line);tf.flip(target);}return tf.floor.count();}pub fn second(allocator: ?std.mem.Allocator) anyerror!usize {_ = allocator;return 0;}const HexType = i7;const Coord = @Vector(2, HexType);const TileFloor = struct {floor: std.AutoHashMap(Coord, void),inline fn flip(self: *@This(), coord: Coord) void {if (!self.floor.remove(coord)) self.floor.put(coord, {}) catch unreachable;}};fn parseInstruction(instruction: Str) Coord {var ret: Coord = .{ 0, 0 };var south = false;var north = false;var step: Coord = undefined;for (instruction) |ch| {switch (ch) {'s' => south = true,'n' => north = true,'e', 'w' => {if (south) {step[1] = 1;} else if (north) {step[1] = -1;} else {step[1] = 0;}switch (ch) {'e' => {if (south or north) step[0] = 1 else step[0] = 2;},'w' => {if (south or north) step[0] = -1 else step[0] = -2;},else => unreachable,}ret += step;south = false;north = false;},else => unreachable,}}return ret;}test "day24a" {try std.testing.expectEqual(@as(usize, 332), try first(std.testing.allocator));}test "day24b" {try std.testing.expectEqual(@as(usize, 0), try second(std.testing.allocator));}test "esew" {try std.testing.expectEqual(Coord{ 1, 1 }, parseInstruction("esew"));}test "nwwswee" {try std.testing.expectEqual(Coord{ 0, 0 }, parseInstruction("nwwswee"));}const test_input =\\sesenwnenenewseeswwswswwnenewsewsw\\neeenesenwnwwswnenewnwwsewnenwseswesw\\seswneswswsenwwnwse\\nwnwneseeswswnenewneswwnewseswneseene\\swweswneswnenwsewnwneneseenw\\eesenwseswswnenwswnwnwsewwnwsene\\sewnenenenesenwsewnenwwwse\\wenwwweseeeweswwwnwwe\\wsweesenenewnwwnwsenewsenwwsesesenwne\\neeswseenwwswnwswswnw\\nenwswwsewswnenenewsenwsenwnesesenew\\enewnwewneswsewnwswenweswnenwsenwsw\\sweneswneswneneenwnewenewwneswswnese\\swwesenesewenwneswnwwneseswwne\\enesenwswwswneneswsenwnewswseenwsese\\wnwnesenesenenwwnenwsewesewsesesew\\nenewswnwewswnenesenwnesewesw\\eneswnwswnwsenenwnwnwwseeswneewsenese\\neswnwewnwnwseenwseesewsenwsweewe\\wseweeenwnesenwwwswnew;