代码

#include <bits/stdc++.h>
using namespace std;
long long n, m, a, b, cnt;

int main() {
	cin >> n >> m >> a >> b;
	cnt += min(n, m) / (a + b) * 2;
	n -= cnt / 2 * (a + b);
	m -= cnt / 2 * (a + b);
	cnt += max(0, int(max(min(n / a, m / b), min(n / b, m / a))));
	cout << cnt;
	return 0;
}

测点