全ACGO最短题解

#include <bits/stdc++.h>
using namespace std;int main(){int a,b,c,d;cin >> a >> b >> c >> d;switch(a + b + c + d){case 0:cout << "0";break;case 1:cout << "1";break;case 2:cout << "2";break;case 3:cout << "1";break;case 4:cout << "0";break;}return 0;}