commit d5e49a910015cbf03cf446d5342132cea6e741bb · ejri.dev/aoc-2025

+7 -7

src/day1.zig

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       const std = @import("std");

     

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       const Allocator = std.mem.Allocator;

     

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       pub fn run(input: []u8) !void {

     

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       pub fn run(_: Allocator, input: []u8) !struct { u64, u64 } {

     

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           var lines = std.mem.tokenizeScalar(u8, input, '\n');

     

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           var dial: u8 = 50;

     

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           var zeroes_p1: u64 = 0;

     

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           var zeroes_p2: u64 = 0;

     

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           var answer1: u64 = 0;

     

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           var answer2: u64 = 0;

     

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           while (lines.next()) |line| {

     

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               const direction: i2 = switch (line[0]) {

     

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                   'L' => -1,

     
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               dial = @intCast(@mod(new_rotation, 100));

     

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               if (dial == 0) {

     

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                   zeroes_p1 += 1;

     

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                   answer1 += 1;

     

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               }

     

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               zeroes_p2 += zeroes_clicked;

     

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               answer2 += zeroes_clicked;

     

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           }

     

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           std.debug.print("Answer P1: {d}\n", .{zeroes_p1});

     

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           std.debug.print("Answer P2: {d}\n", .{zeroes_p2});

     

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           return .{ answer1, answer2 };

     

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       }

+3 -3

src/day2.zig

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       const std = @import("std");

     

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       const Allocator = std.mem.Allocator;

     

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       pub fn run(input: []u8) !void {

     

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       pub fn run(_: Allocator, input: []u8) !struct { u64, u64 } {

     

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           var ranges = std.mem.tokenizeScalar(u8, std.mem.trimEnd(u8, input, "\n"), ',');

     

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           var answer1: u64 = 0;

     
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               }

     

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           }

     

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           std.debug.print("Answer P1: {d}\n", .{answer1});

     

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           std.debug.print("Answer P2: {d}\n", .{answer2});

     

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           return .{ answer1, answer2 };

     

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       }

+3 -3

src/day3.zig

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       const std = @import("std");

     

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       const Allocator = std.mem.Allocator;

     

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       pub fn run(input: []u8) !void {

     

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       pub fn run(_: Allocator, input: []u8) !struct { u64, u64 } {

     

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           var lines = std.mem.tokenizeScalar(u8, input, '\n');

     

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           var answer1: u64 = 0;

     
···

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               answer2 += try calculateJoltage(line, 12);

     

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           }

     

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           std.debug.print("Answer P1: {d}\n", .{answer1});

     

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           std.debug.print("Answer P2: {d}\n", .{answer2});

     

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           return .{ answer1, answer2 };

     

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       }

     

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       fn calculateJoltage(line: []const u8, num_digits: usize) !u64 {

+3 -3

src/day4.zig

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       const std = @import("std");

     

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       const Allocator = std.mem.Allocator;

     

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       const StringTokenIterator = std.mem.TokenIterator(u8, .scalar);

     

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       const MAX_WIDTH = 137;

     
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           return .{ .data = grid, .maxX = line_len, .maxY = i };

     

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       }

     

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       pub fn run(input: []u8) !void {

     

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       pub fn run(_: Allocator, input: []u8) !struct { u64, u64 } {

     

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           var lines = std.mem.tokenizeScalar(u8, input, '\n');

     

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           const grid = try newGrid(&lines);

     
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               }

     

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           }

     

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           std.debug.print("Answer P1: {d}\n", .{answer1});

     

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           std.debug.print("Answer P2: {d}\n", .{answer2});

     

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           return .{ answer1, answer2 };

     

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       }

+2 -3

src/day5.zig

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           }

     

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       };

     

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       pub fn run(allocator: Allocator, input: []u8) !void {

     

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       pub fn run(allocator: Allocator, input: []u8) !struct { u64, u64 } {

     

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           var sections = std.mem.tokenizeSequence(u8, input, "\n\n");

     

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           var answer1: u64 = 0;

     
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               answer2 += item.high - item.low + 1;

     

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           }

     

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           std.debug.print("Answer P1: {d}\n", .{answer1});

     

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           std.debug.print("Answer P2: {d}\n", .{answer2});

     

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           return .{ answer1, answer2 };

     

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       }

+6

src/day6.zig

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       const std = @import("std");

     

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       const Allocator = std.mem.Allocator;

     

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       pub fn run(allocator: Allocator, input: []u8) !void {

     

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           return .{ 0, 0 };

     

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       }

+19 -14

src/main.zig

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       const std = @import("std");

     

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       const day1 = @import("./day1.zig");

     

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       const day2 = @import("./day2.zig");

     

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       const day3 = @import("./day3.zig");

     

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       const day4 = @import("./day4.zig");

     

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       const day5 = @import("./day5.zig");

     

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       const days = .{

     

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           @import("./day1.zig"),

     

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           @import("./day2.zig"),

     

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           @import("./day3.zig"),

     

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           @import("./day4.zig"),

     

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           @import("./day5.zig"),

     

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       };

     

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       pub fn main() !void {

     

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           var args = std.process.args();

     
···

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           var gpa: std.heap.GeneralPurposeAllocator(.{}) = .init;

     

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           const allocator = gpa.allocator();

     

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           const day = try std.fmt.parseInt(u4, day_str, 10);

     

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           const day_num = try std.fmt.parseInt(u4, day_str, 10);

     

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           const input_path = try std.fmt.allocPrint(allocator, "inputs/day{d}{s}.txt", .{ day, test_str });

     

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           const input_path = try std.fmt.allocPrint(allocator, "inputs/day{d}{s}.txt", .{ day_num, test_str });

     

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           defer allocator.free(input_path);

     

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           const input_file = try std.fs.cwd().openFile(input_path, .{});

     
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           const input_content = try reader.interface.allocRemaining(allocator, .unlimited);

     

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           defer allocator.free(input_content);

     

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           switch (day) {

     

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               1 => try day1.run(input_content),

     

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               2 => try day2.run(input_content),

     

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               3 => try day3.run(input_content),

     

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               4 => try day4.run(input_content),

     

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               5 => try day5.run(allocator, input_content),

     

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               else => {},

     

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           inline for (days, 1..) |day, i| {

     

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               if (i == day_num) {

     

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                   std.debug.print("Day {d}\n\n", .{i});

     

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                   const answer1, const answer2 = try day.run(allocator, input_content);

     

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                   std.debug.print("Answer P1: {d}\n", .{answer1});

     

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                   std.debug.print("Answer P2: {d}\n", .{answer2});

     

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                   break;

     

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               }

     

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           }

     

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       }