2024: Day 4 completed

2024/data/day4.txt

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2024/src/day3.zig

@@ -105,12 +105,12 @@ pub fn main() !void {
     window.reset();
     const p2 = try maybeScan(u8, &window);
 
-    log.info("PART 1: {d}\n", .{p1});
+    log.info("PART 1: {d}", .{p1});
-    log.info("PART 2: {d}\n", .{p2});
+    log.info("PART 2: {d}", .{p2});
 }
 
 test "memory" {
-    const input = try util.readAllInput(3, std.testing.allocator);
+    const input = try util.readAllInput(3, util.test_alloc);
     defer std.testing.allocator.free(input);
 
     var mul = MulOp.init();

2024/src/day4.zig

@@ -0,0 +1,122 @@
+const std = @import("std");
+
+const util = @import("util.zig");
+const log = util.log;
+
+const Directions = enum { e, w, n, s, ne, nw, se, sw, done };
+
+fn toMatrix(allocator: std.mem.Allocator) !std.ArrayList([]const u8) {
+    const input = try util.readAllInput(4, allocator);
+    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});
+}

2024/src/util.zig

@@ -5,24 +5,22 @@ const TokenIterator = std.mem.TokenIterator;
 // Memory
 var gpa = std.heap.GeneralPurposeAllocator(.{}){};
 pub const alloc = gpa.allocator();
+pub const test_alloc = std.testing.allocator;
 
 // Logging
 pub const log = std.log.default;
 
 // Functions
-pub fn tokenizeAllInput(allocator: Allocator, outputType: type, day: u8) !TokenIterator {
+pub fn inputTo2x2(comptime T: type, allocator: Allocator, input: []const T, delimiter: T) !std.ArrayList([]const T) {
-    var fileName: [16]u8 = undefined;
+    var out = std.ArrayList([]const T).init(allocator);
-    const inputFile = try std.fmt.bufPrint(&fileName, "day{d}.txt", .{day});
+    errdefer out.deinit();
 
-    var dir = try std.fs.cwd().openDir("../data", .{});
+    var items = std.mem.tokenizeScalar(u8, input, delimiter);
-    defer dir.close();
+    while (items.next()) |item| {
+        try out.append(item);
+    }
 
-    const file = try dir.openFile(inputFile, .{});
+    return out;
-    defer file.close();
-
-    const stat = try file.stat();
-    const input = try file.reader().readAllAlloc(allocator, stat.size);
-    return inputToArrayList(outputType, allocator, input);
 }
 
 pub fn readAllInput(day: u8, allocator: std.mem.Allocator) ![]const u8 {