From 45b25120e06ab13df098ef6b576c5fe646bc1c2f Mon Sep 17 00:00:00 2001 From: ktkk Date: Tue, 2 Dec 2025 10:41:55 +0000 Subject: [PATCH] Finish day02, part 1 --- src/days/day02.zig | 38 +++++++++++++++++++++++++++++++++++++- src/days/input/day02.txt | 1 + 2 files changed, 38 insertions(+), 1 deletion(-) create mode 100755 src/days/input/day02.txt diff --git a/src/days/day02.zig b/src/days/day02.zig index 4de3c68..098b80e 100644 --- a/src/days/day02.zig +++ b/src/days/day02.zig @@ -2,6 +2,42 @@ const std = @import("std"); pub const title = "Day 02"; -pub fn run(_: std.mem.Allocator) !void { +pub fn run(allocator: std.mem.Allocator) !void { + const input = @embedFile("./input/day02.txt"); + var ranges = std.mem.tokenizeScalar(u8, input, ','); + + var accumulator: u64 = 0; + + while (ranges.next()) |range| { + var components = std.mem.tokenizeScalar(u8, range, '-'); + const start_s = std.mem.trim(u8, components.next() orelse continue, &std.ascii.whitespace); + const end_s = std.mem.trim(u8, components.next() orelse continue, &std.ascii.whitespace); + const start = try std.fmt.parseUnsigned(u64, start_s, 10); + const end = try std.fmt.parseUnsigned(u64, end_s, 10); + + std.debug.print("{d} to {d}\n", .{start, end}); + + outer: for (start..end+1) |id| { + const id_s = try std.fmt.allocPrint(allocator, "{}", .{id}); + defer allocator.free(id_s); + + if (id_s.len % 2 == 1) continue; + + for (0..id_s.len / 2) |i| { + if (id_s[i] != id_s[i + id_s.len / 2]) { + continue :outer; + } + } + accumulator += id; + } + } + + var buffer: [64]u8 = undefined; + var stdout_writer = std.fs.File.stdout().writer(&buffer); + const stdout = &stdout_writer.interface; + + try stdout.print("{d}\n", .{accumulator}); + + try stdout.flush(); } diff --git a/src/days/input/day02.txt b/src/days/input/day02.txt new file mode 100755 index 0000000..69086d8 --- /dev/null +++ b/src/days/input/day02.txt @@ -0,0 +1 @@ +52500467-52574194,655624494-655688785,551225-576932,8418349387-8418411293,678-1464,33-79,74691-118637,8787869169-8787890635,9898977468-9899009083,548472423-548598890,337245835-337375280,482823-543075,926266-991539,1642682920-1642753675,3834997-3940764,1519-2653,39697698-39890329,3-21,3251796-3429874,3467-9298,26220798-26290827,80-124,200638-280634,666386-710754,21329-64315,250-528,9202893-9264498,819775-903385,292490-356024,22-32,2663033-2791382,133-239,56514707-56704320,432810-458773,4949427889-4949576808