hack:

10 5 10 12

ans:

No

以下代码输出:

Yes

#include<bits/stdc++.h>
using namespace std;
int main(){
    long long a,b,c,d;
    cin>>a>>b>>c>>d;
    if((a+b)+c==d)cout<<"Yes";
    else if((a-b)+c==d)cout<<"Yes";
    else if((a*b)+c==d)cout<<"Yes";
    else if((a/b)+c==d)cout<<"Yes";
    else if((a+b)-c==d)cout<<"Yes";
    else if((a-b)-c==d)cout<<"Yes";
    else if((a*b)-c==d)cout<<"Yes";
    else if((a/b)-c==d)cout<<"Yes";
    else if((a+b)*c==d)cout<<"Yes";
    else if((a-b)*c==d)cout<<"Yes";
    else if((a*b)*c==d)cout<<"Yes";
    else if((a/b)*c==d)cout<<"Yes";
    else if((a+b)/c==d)cout<<"Yes";
    else if((a-b)/c==d)cout<<"Yes";
    else if((a*b)/c==d)cout<<"Yes";
    else if((a/b)/c==d)cout<<"Yes";
    else cout<<"No";
}