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base: katkak:ee219fc9b2f9b0ebc078508778294e82fd83e64a
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katkak:day12
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katkak:day05
katkak:day04
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compare: katkak:fd0a34c35e589ce267723b14f814826b5f90e3ec
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katkak:master
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katkak:day10
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katkak:day05
katkak:day04
katkak:day02
katkak:day03
katkak:day01

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87
src/days/day02.zig
View file

@ -3,92 +3,5 @@ const std = @import("std");
pub const title = "Day 02";
pub fn run(_: std.mem.Allocator) !void {
const input = std.mem.trim(u8, @embedFile("./input/day02.txt"), &std.ascii.whitespace);
//const input =
// \\11-22,95-115,998-1012,1188511880-1188511890,222220-222224,1698522-1698528,446443-446449,38593856-38593862,565653-565659,824824821-824824827,2121212118-2121212124
// ;
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 = components.next() orelse continue;
const end_s = components.next() orelse continue;
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});
try processRange(&accumulator, start, end);
}
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();
}
fn processRange(accumulator: *u64, start: u64, end: u64) !void {
for (start..end+1) |id| {
std.debug.print("-- Checking {d} --\n", .{id});
// IDs smaller than 10 cannot possibly have repeated digits
if (id / 10 == 0) {
std.debug.print("Skipping {d}\n", .{id});
continue;
}
const len = getLen(id);
inner: for (2..len + 1) |divisor| {
if (len % divisor != 0) continue;
std.debug.print("divisor = {d}\n", .{divisor});
const offset = len / divisor;
std.debug.print("offset = {d}\n", .{offset});
for (0..offset) |i| {
const a = getDigit(id, i);
std.debug.print("a = {d}\n", .{a});
for (1..divisor) |n| {
const b = getDigit(id, i + offset * n);
std.debug.print("b = {d}\n", .{b});
if (a != b) {
continue :inner;
}
}
}
// If we get here, it means id is a valid cadidate
std.debug.print("result = {d}\n", .{id});
accumulator.* += id;
break;
}
}
}
fn getDigit(x: u64, n: usize) u8 {
var new_x = x;
for (0..n) |_| {
new_x /= 10;
}
return @intCast(new_x % 10);
}
fn getLen(x: u64) usize {
var new_x = x;
var n: usize = 0;
while (true) {
n += 1;
new_x /= 10;
if (new_x == 0) break;
}
return n;
}

1
src/days/input/day02.txt
View file

@ -1 +0,0 @@
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