advent-of-code/2023/2/main-2.cpp

#include <bits/stdc++.h>
using namespace std;

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);

	int ret = 0, id = 0, r = 0, g = 0, b = 0;

	while (!cin.eof()) {
		switch (cin.get()) {
		case 'G':
			cin.ignore(4);
			cin >> id;
			break;
		case ':': case ',': case ';':
			cin.ignore(1);
			int n;
			cin >> n;
			cin.ignore(1);
			switch (cin.get()) {
			case 'r': r = max(n, r); break;
			case 'g': g = max(n, g); break;
			case 'b': b = max(n, b); break;
			}
			break;
		case '\n':
		case EOF:
			ret += r * g * b;
			r = 0; g = 0; b = 0;
			break;
		}
	}

	cout << ret << '\n';
}