adventofcode

day2_part2.ha (1840B)

// SPDX-FileCopyrightText: 2023 Haelwenn (lanodan) Monnier <contact+aoc2023@hacktivis.me>
// SPDX-License-Identifier: MIT
use bufio;
use strings;
use strconv;
use fmt;
use os;
use io;
type game = struct {
	red: uint,
	green: uint,
	blue: uint,
};
export fn main() void = {
	let total = 0u32;
	for(let id = 1u32; true; id += 1) {
		const line = match(bufio::read_line(os::stdin)) {
		case let l: []u8 => yield l;
		case io::EOF => break;
		case => abort();
		};
		const line = strings::fromutf8(line)!;
		let val = game {
			red = 0,
			green = 0,
			blue = 0,
		};
		const (id_str, reveal) = strings::cut(line, ": ");
		//fmt::printfln("{}={} | {}", id, id_str, reveal)!;
		let hands = strings::tokenize(reveal, "; ");
		for(true) {
			const hand = match(strings::next_token(&hands)) {
			case let h: str => yield h;
			case void => break;
			};
			//fmt::printfln("	hand: {}", hand)!;
			
			let colors = strings::tokenize(hand, ", ");
			for(true) {
				const color = match(strings::next_token(&colors)) {
				case let h: str => yield h;
				case void => break;
				};
				//fmt::printfln("	color: {}", color)!;
				const (n, color) = strings::cut(color, " ");
				const n = match(strconv::stou(n)) {
				case let u: uint =>
					yield u;
				case =>
					fmt::fatalf("Not a number: {}", n);
				};
				switch(color) {
				case "red" =>
					if(n > val.red) {
						val.red = n;
					};
				case "green" =>
					if(n > val.green) {
						val.green = n;
					};
				case "blue" =>
					if(n > val.blue) {
						val.blue = n;
					};
				case =>
					fmt::fatalf("Unknown color: {}", color);
				};
			};
		};
		fmt::printf("{} = R{}, G{}, B{}", id, val.red, val.green, val.blue)!;
		const pow = val.red * val.green * val.blue;
		fmt::printfln(" POW: {}", pow)!;
		total += pow;
	};
	fmt::printfln("Total: {}", total)!;
};