Add solution for day20a
Created by voroskoi on July 4, 2022
I2GPIFE63VQ723HFNXFYO3D4OOMR5QZFNQXTAR5TFOVMOHKXRHTAC Dependencies
In channels
main
Change contents
Insertion in src/main_test.zig at line 21 [3.55]
Insertion in src/main.zig at line 23 [3.129]
Replacement in src/main.zig at line 26 [3.129]
File addition: day20.txt
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3061:####..#.###.....##..................#.....#.#..###.#.#..#..#.#...#...##........#.....#.#..#..#....##File addition: day20.zig
[3.15]const std = @import("std");const PATH = "input/day20.txt";const Str = []const u8;const TileData = [10][10]bool;const Tile = struct {id: u16,data: TileData,// rotating leftfn rotate(self: *@This()) void {var rotated: TileData = undefined;for (self.data) |line, row| {for (line) |item, col| {rotated[self.data.len - 1 - col][row] = item;}}self.data = rotated;}fn flip(self: *@This(), axis: u1) void {var flipped: TileData = undefined;switch (axis) {0 => return,1 => {// horizontal flipfor (self.data) |slice, row| {flipped[self.data.len - 1 - row] = slice;}},}self.data = flipped;}};const Image = struct {tiles: []Tile,size: u8 = undefined,visited: std.AutoHashMap(u16, void),current_tile: [2]u8 = .{ 0, 0 },order: std.ArrayList(usize),fn checkLeft(self: @This(), candidate: Tile) bool {// left column is always goodif (self.current_tile[1] == 0) return true;// last item's right side should be equal to candidate left sidefor (candidate.data) |_, row| {if (self.tiles[self.order.items[self.order.items.len - 1]].data[row][candidate.data.len - 1] != candidate.data[row][0]) return false;}return true;}fn checkUpper(self: @This(), candidate: Tile) bool {// top row is always goodif (self.current_tile[0] == 0) return true;// index of the upper element in self.orderconst upper = (self.current_tile[0] - 1) * self.size + self.current_tile[1];// compare upper last line with candidate's first linereturn std.mem.eql(bool,&self.tiles[self.order.items[upper]].data[candidate.data.len - 1],&candidate.data[0],);}fn solve(self: *@This()) bool {// all item in placeif (self.current_tile[0] == self.size) {return true;}var idx: usize = 0;while (idx < self.tiles.len) : (idx += 1) {const candidate = self.tiles[idx];if (self.visited.contains(candidate.id)) {// next 8 item has the same id, skip them!// while adds one more, so it is 7 hereidx += 7;continue;}if (!self.checkUpper(candidate)) continue;if (!self.checkLeft(candidate)) continue;self.order.append(idx) catch unreachable;self.visited.put(candidate.id, {}) catch unreachable;// move current_tile forwardconst old_tile = self.current_tile;if (self.current_tile[1] != self.size - 1) {self.current_tile[1] += 1;} else {self.current_tile[0] += 1;self.current_tile[1] = 0;}if (self.solve()) {return true;} else {// restore items_ = self.order.pop();_ = self.visited.remove(candidate.id);self.current_tile = old_tile;}}return false;}};pub fn first(allocator: ?std.mem.Allocator) anyerror!usize {var image = Image{.tiles = undefined,.visited = std.AutoHashMap(u16, void).init(allocator.?),.order = std.ArrayList(usize).init(allocator.?),};image.tiles = try parseInput(allocator.?, @embedFile(PATH));defer {allocator.?.free(image.tiles);image.visited.deinit();image.order.deinit();}image.size = @intCast(u8, std.math.sqrt(image.tiles.len / 8));if (!image.solve()) unreachable;var mul: usize = 1;for ([_]usize{0,image.size - 1,image.size * image.size - image.size,image.size * image.size - 1,}) |order_no| {mul *= image.tiles[image.order.items[order_no]].id;}return mul;}pub fn second(allocator: ?std.mem.Allocator) anyerror!usize {_ = allocator;return 0;}fn parseInput(allocator: std.mem.Allocator, input: Str) anyerror![]Tile {var ret = std.ArrayList(Tile).init(allocator);var lines = std.mem.split(u8, input, "\n");var t: Tile = undefined;var l_no: usize = 0;while (lines.next()) |line| {if (line.len == 0) {try flipRotate(&ret, &t);l_no = 0;t = undefined;continue;}switch (line[0]) {'T' => {t.id = try std.fmt.parseUnsigned(u16, line[5..9], 10);},'.', '#' => {for (line) |ch, idx| {switch (ch) {'.' => t.data[l_no][idx] = false,'#' => t.data[l_no][idx] = true,else => unreachable,}}l_no += 1;},else => unreachable,}}// add the last item...try flipRotate(&ret, &t);return ret.toOwnedSlice();}fn flipRotate(ret: *std.ArrayList(Tile), t: *Tile) !void {for ([_]u1{ 0, 1 }) |flip| {t.flip(flip);for ([_]u2{ 0, 1, 2, 3 }) |_| {t.rotate();try ret.append(t.*);}}}test "day20a" {try std.testing.expectEqual(@as(usize, 83775126454273), try first(std.testing.allocator));}test "day20b" {try std.testing.expectEqual(@as(usize, 0), try second(std.testing.allocator));}const test_input =\\Tile 2311:\\..##.#..#.\\##..#.....\\#...##..#.\\####.#...#\\##.##.###.\\##...#.###\\.#.#.#..##\\..#....#..\\###...#.#.\\..###..###\\\\Tile 1951:\\#.##...##.\\#.####...#\\.....#..##\\#...######\\.##.#....#\\.###.#####\\###.##.##.\\.###....#.\\..#.#..#.#\\#...##.#..\\\\Tile 1171:\\####...##.\\#..##.#..#\\##.#..#.#.\\.###.####.\\..###.####\\.##....##.\\.#...####.\\#.##.####.\\####..#...\\.....##...\\\\Tile 1427:\\###.##.#..\\.#..#.##..\\.#.##.#..#\\#.#.#.##.#\\....#...##\\...##..##.\\...#.#####\\.#.####.#.\\..#..###.#\\..##.#..#.\\\\Tile 1489:\\##.#.#....\\..##...#..\\.##..##...\\..#...#...\\#####...#.\\#..#.#.#.#\\...#.#.#..\\##.#...##.\\..##.##.##\\###.##.#..\\\\Tile 2473:\\#....####.\\#..#.##...\\#.##..#...\\######.#.#\\.#...#.#.#\\.#########\\.###.#..#.\\########.#\\##...##.#.\\..###.#.#.\\\\Tile 2971:\\..#.#....#\\#...###...\\#.#.###...\\##.##..#..\\.#####..##\\.#..####.#\\#..#.#..#.\\..####.###\\..#.#.###.\\...#.#.#.#\\\\Tile 2729:\\...#.#.#.#\\####.#....\\..#.#.....\\....#..#.#\\.##..##.#.\\.#.####...\\####.#.#..\\##.####...\\##..#.##..\\#.##...##.\\\\Tile 3079:\\#.#.#####.\\.#..######\\..#.......\\######....\\####.#..#.\\.#...#.##.\\#.#####.##\\..#.###...\\..#.......\\..#.###...;