Days 1, 2, and 3

.envrc

···
+use flake .

.gitignore

···
+/.direnv
+/zig-out
+/.zig-cache

build.zig

···
+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    const exe = b.addExecutable(.{
+        .name = "aoc2025",
+        .root_module = b.createModule(.{
+            .root_source_file = b.path("src/main.zig"),
+            .target = target,
+            .optimize = optimize,
+        }),
+    });
+
+    b.installArtifact(exe);
+
+    const run_step = b.step("run", "Run the app");
+
+    const run_cmd = b.addRunArtifact(exe);
+    run_step.dependOn(&run_cmd.step);
+
+    run_cmd.step.dependOn(b.getInstallStep());
+
+    if (b.args) |args| {
+        run_cmd.addArgs(args);
+    }
+
+    const exe_tests = b.addTest(.{
+        .root_module = exe.root_module,
+    });
+
+    const run_exe_tests = b.addRunArtifact(exe_tests);
+
+    const test_step = b.step("test", "Run tests");
+    test_step.dependOn(&run_exe_tests.step);
+}

build.zig.zon

···
+.{
+    .name = .aoc2025,
+    .version = "0.0.0",
+    .fingerprint = 0x52176dd5968cb572,
+    .minimum_zig_version = "0.15.2",
+    .dependencies = .{},
+    .paths = .{
+        "build.zig",
+        "build.zig.zon",
+        "src",
+    },
+}

flake.lock

···
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1764517877,
+        "narHash": "sha256-pp3uT4hHijIC8JUK5MEqeAWmParJrgBVzHLNfJDZxg4=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "2d293cbfa5a793b4c50d17c05ef9e385b90edf6c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "systems": "systems"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "id": "systems",
+        "type": "indirect"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

···
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs =
+    {
+      systems,
+      nixpkgs,
+      ...
+    }:
+    let
+      eachSystem = nixpkgs.lib.genAttrs (import systems);
+    in
+    {
+      devShells = eachSystem (
+        system:
+        let
+          pkgs = nixpkgs.legacyPackages.${system};
+        in
+        {
+          default = nixpkgs.legacyPackages.${system}.mkShell {
+            packages = [
+              pkgs.zig
+              pkgs.zls
+            ];
+          };
+        }
+      );
+    };
+}

inputs/day1.txt

···
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inputs/day1test.txt

···
+L68
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inputs/day2.txt

···
+1061119-1154492,3-23,5180469-5306947,21571-38630,1054-2693,141-277,2818561476-2818661701,21177468-21246892,40-114,782642-950030,376322779-376410708,9936250-10074071,761705028-761825622,77648376-77727819,2954-10213,49589608-49781516,9797966713-9797988709,4353854-4515174,3794829-3861584,7709002-7854055,7877419320-7877566799,953065-1022091,104188-122245,25-39,125490-144195,931903328-931946237,341512-578341,262197-334859,39518-96428,653264-676258,304-842,167882-252124,11748-19561

inputs/day2test.txt

···
+11-22,95-115,998-1012,1188511880-1188511890,222220-222224,1698522-1698528,446443-446449,38593856-38593862,565653-565659,824824821-824824827,2121212118-2121212124

inputs/day3.txt

···
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inputs/day3test.txt

···
[phone]
[phone]
[phone]
[phone]

src/day1.zig

···
+const std = @import("std");
+
+pub fn run(input: []u8) !void {
+    var lines = std.mem.tokenizeScalar(u8, input, '\n');
+
+    var dial: u8 = 50;
+    var zeroes_p1: u64 = 0;
+    var zeroes_p2: u64 = 0;
+    while (lines.next()) |line| {
+        const direction: i2 = switch (line[0]) {
+            'L' => -1,
+            'R' => 1,
+            else => unreachable,
+        };
+        const turns = try std.fmt.parseInt(u16, line[1..], 10);
+
+        const new_rotation: i17 = dial + @as(i17, direction) * turns;
+
+        var zeroes_clicked: u64 = @intCast(@abs(@divTrunc(new_rotation, 100)));
+        if (dial != 0 and new_rotation <= 0) {
+            zeroes_clicked += 1;
+        }
+
+        dial = @intCast(@mod(new_rotation, 100));
+
+        if (dial == 0) {
+            zeroes_p1 += 1;
+        }
+
+        zeroes_p2 += zeroes_clicked;
+    }
+
+    std.debug.print("Answer P1: {d}\n", .{zeroes_p1});
+    std.debug.print("Answer P2: {d}\n", .{zeroes_p2});
+}

src/day2.zig

···
+const std = @import("std");
+
+pub fn run(input: []u8) !void {
+    var ranges = std.mem.tokenizeScalar(u8, std.mem.trimEnd(u8, input, "\n"), ',');
+
+    var answer1: u64 = 0;
+    var answer2: u64 = 0;
+    while (ranges.next()) |range_str| {
+        var range = std.mem.tokenizeScalar(u8, range_str, '-');
+
+        const low = try std.fmt.parseInt(u64, range.next().?, 10);
+        const high = try std.fmt.parseInt(u64, range.next().?, 10);
+
+        var buf: [32]u8 = undefined;
+        for (low..high + 1) |num| {
+            const num_str = try std.fmt.bufPrint(&buf, "{d}", .{num});
+
+            const middle = num_str.len / 2;
+
+            if (std.mem.eql(u8, num_str[0..middle], num_str[middle..])) {
+                answer1 += num;
+                answer2 += num;
+                continue;
+            }
+
+            for (1..middle + 1) |chunk_len| {
+                const repeating_str = num_str[0..chunk_len];
+
+                var is_repeating = true;
+                var i = chunk_len;
+                while (i + chunk_len <= num_str.len) : (i += chunk_len) {
+                    if (num_str.len % chunk_len != 0) {
+                        is_repeating = false;
+                        break;
+                    }
+
+                    if (!std.mem.eql(u8, repeating_str, num_str[i .. i + chunk_len])) {
+                        is_repeating = false;
+                        break;
+                    }
+                }
+
+                if (is_repeating) {
+                    answer2 += num;
+                    break;
+                }
+            }
+        }
+    }
+
+    std.debug.print("Answer P1: {d}\n", .{answer1});
+    std.debug.print("Answer P2: {d}\n", .{answer2});
+}

src/day3.zig

···
+const std = @import("std");
+
+pub fn run(input: []u8) !void {
+    var lines = std.mem.tokenizeScalar(u8, input, '\n');
+
+    var answer1: u64 = 0;
+    var answer2: u64 = 0;
+    while (lines.next()) |line| {
+        answer1 += try calculateJoltage(line, 2);
+        answer2 += try calculateJoltage(line, 12);
+    }
+
+    std.debug.print("Answer P1: {d}\n", .{answer1});
+    std.debug.print("Answer P2: {d}\n", .{answer2});
+}
+
+fn calculateJoltage(line: []const u8, num_digits: usize) !u64 {
+    var index: usize = 0;
+    var value: usize = 0;
+    var total: usize = 0;
+    for (0..num_digits) |i| {
+        const start = if (i == 0) 0 else index + 1;
+        const end = line.len - (num_digits - i - 1);
+
+        index = std.mem.indexOfMax(u8, line[start..end]) + start;
+        value = try std.fmt.charToDigit(line[index], 10);
+
+        total += value * std.math.pow(usize, 10, num_digits - i - 1);
+    }
+
+    return total;
+}

src/main.zig

···
+const std = @import("std");
+const day1 = @import("./day1.zig");
+const day2 = @import("./day2.zig");
+const day3 = @import("./day3.zig");
+
+pub fn main() !void {
+    var args = std.process.args();
+    _ = args.skip();
+
+    const day_str = args.next() orelse {
+        std.debug.print("Needs day arg\n", .{});
+        std.process.exit(0);
+    };
+
+    const test_str = args.next() orelse "";
+
+    var gpa: std.heap.GeneralPurposeAllocator(.{}) = .init;
+    const allocator = gpa.allocator();
+
+    const day = try std.fmt.parseInt(u4, day_str, 10);
+
+    const input_path = try std.fmt.allocPrint(allocator, "inputs/day{d}{s}.txt", .{ day, test_str });
+    defer allocator.free(input_path);
+
+    const input_file = try std.fs.cwd().openFile(input_path, .{});
+    defer input_file.close();
+
+    var buf: [4096]u8 = undefined;
+
+    var reader = input_file.reader(&buf);
+    const input_content = try reader.interface.allocRemaining(allocator, .unlimited);
+    defer allocator.free(input_content);
+
+    switch (day) {
+        1 => try day1.run(input_content),
+        2 => try day2.run(input_content),
+        3 => try day3.run(input_content),
+        else => {},
+    }
+}