From 7dc3712207ab47511a316ff6e445d88aa86d409f Mon Sep 17 00:00:00 2001 From: Andrew Scott Date: Thu, 12 Dec 2024 00:05:49 -0500 Subject: [PATCH] 2024: Day 4 completed --- 2024/data/day4.txt | 140 +++++++++++++++++++++++++++++++++++++++++++++ 2024/src/day4.zig | 122 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 262 insertions(+) create mode 100644 2024/data/day4.txt create mode 100644 2024/src/day4.zig diff --git a/2024/data/day4.txt b/2024/data/day4.txt new file mode 100644 index 0000000..a89f70c --- /dev/null +++ b/2024/data/day4.txt @@ -0,0 +1,140 @@ +MMSMXMSASXMXAXMAXSASXXXMASAMXSMMMXMMXMXMASMXMASMSMXSSXMASXSMMSASMSAXAMXMAMMMSAMXXXMAMSMXMMMXMASXMAXXMMMXMMSAMXAMMSMSSMSMMMSMMXSXXAXMXSAXMASX +XAXMASMXMASASXSXAMAMXMXMAXAMXSASAMXMAMAMSAMSSXMMAXASXAMAMSMAXMXMASMSASASASAAMAMXSMSMSAXAAXXAMSSMXMXSMAMXXAXAXXASXAMAAXAAXXMAXAXXMMSSMSSXSASA +XMASXXXASAMAMASMMMAMMSASXSXMASAMMAXSAXXXMASXMASMSMMMMXMAXAXXMSAMXMAAXSASASMXSAMAAAAXSASMMMMMSAXMASAMSAMSMMSAMSAMAMMXSMSXMASXMASAASAAXMAMMAMM 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+ errdefer allocator.free(input); + + const mat: std.ArrayList([]const u8) = try util.inputTo2x2(u8, allocator, input, '\n'); + errdefer mat.deinit(); + + return mat; +} + +fn isValidPoint(x: i16, y: i16, max: [2]u8) bool { + return 0 <= x and x <= max[0] and 0 <= y and y <= max[1]; +} + +fn isXmas(matrix: [][]const u8, start: [2]u8, max: [2]u8, delta: [2]i8) !bool { + for (1..4) |i| { + const step: i8 = @intCast(i); + const x = try std.math.add(i16, @intCast(start[0]), delta[0] * step); + const y = try std.math.add(i16, @intCast(start[1]), delta[1] * step); + + if (!isValidPoint(x, y, max)) { + return false; + } + + const ux: u8 = @intCast(x); + const uy: u8 = @intCast(y); + if ((i == 1 and matrix[ux][uy] != 'M') or + (i == 2 and matrix[ux][uy] != 'A') or + (i == 3 and matrix[ux][uy] != 'S')) + { + return false; + } + } + return true; +} + +fn part1(matrix: [][]const u8, start: [2]u8, max: [2]u8) !u8 { + var result: u8 = 0; + var direction: Directions = .e; + + var delta: [2]i8 = .{ 0, 0 }; + while (direction != .done) { + const new_direction = @intFromEnum(direction) + 1; + defer direction = @enumFromInt(new_direction); + + switch (direction) { + .e => delta = .{ 0, 1 }, + .w => delta = .{ 0, -1 }, + .n => delta = .{ -1, 0 }, + .s => delta = .{ 1, 0 }, + .ne => delta = .{ -1, 1 }, + .nw => delta = .{ -1, -1 }, + .se => delta = .{ 1, 1 }, + .sw => delta = .{ 1, -1 }, + else => unreachable, + } + if (try isXmas(matrix, start, max, delta)) + result += 1; + } + return result; +} + +fn part2(matrix: [][]const u8, start: [2]u8, max: [2]u8) !bool { + const nw_pt = .{ try std.math.add(i16, @intCast(start[0]), -1), try std.math.add(i16, @intCast(start[1]), -1) }; + const ne_pt = .{ try std.math.add(i16, @intCast(start[0]), -1), try std.math.add(i16, @intCast(start[1]), 1) }; + const sw_pt = .{ try std.math.add(i16, @intCast(start[0]), 1), try std.math.add(i16, @intCast(start[1]), -1) }; + const se_pt = .{ try std.math.add(i16, @intCast(start[0]), 1), try std.math.add(i16, @intCast(start[1]), 1) }; + + if (!isValidPoint(nw_pt[0], nw_pt[1], max) or + !isValidPoint(ne_pt[0], ne_pt[1], max) or + !isValidPoint(sw_pt[0], sw_pt[1], max) or + !isValidPoint(se_pt[0], se_pt[1], max)) + { + return false; + } + + const nw_ch = matrix[start[0] - 1][start[1] - 1]; + const ne_ch = matrix[start[0] - 1][start[1] + 1]; + const sw_ch = matrix[start[0] + 1][start[1] - 1]; + const se_ch = matrix[start[0] + 1][start[1] + 1]; + + if (!(nw_ch == 'M' and ne_ch == 'M' and sw_ch == 'S' and se_ch == 'S') and + !(nw_ch == 'S' and ne_ch == 'S' and sw_ch == 'M' and se_ch == 'M') and + !(nw_ch == 'M' and ne_ch == 'S' and sw_ch == 'M' and se_ch == 'S') and + !(nw_ch == 'S' and ne_ch == 'M' and sw_ch == 'S' and se_ch == 'M')) + { + return false; + } + + return true; +} + +pub fn main() !void { + const allocator = util.alloc; + const mat = try toMatrix(allocator); + defer mat.deinit(); + + const max: [2]u8 = .{ @intCast(mat.items[0].len - 1), @intCast(mat.items.len - 1) }; + + var p1: u16 = 0; + var p2: u16 = 0; + for (mat.items, 0..) |_, row| { + for (mat.items[row], 0..) |_, col| { + const start: [2]u8 = .{ @intCast(row), @intCast(col) }; + if (mat.items[row][col] == 'X') + p1 += try part1(mat.items, start, max); + + if (mat.items[row][col] == 'A') + p2 += if (try part2(mat.items, start, max)) 1 else 0; + } + } + + log.info("PART 1: {d}", .{p1}); + log.info("PART 2: {d}", .{p2}); +}