AC了，谢谢大家对本蒟蒻的帮助，此贴结。
by npc000 @ 2023-12-29 21:09:52
~~来自蒟蒻的帮助~~
```cpp
#include <bits/stdc++.h>
#define db double
#define rtn return
using namespace std;
long long a[6];
int main() {
cin>>a[1]>>a[2]>>a[3]>>a[4];
for(int i=1;i<=2;i++){
for(int j=3;j<=4;j++){
int o=a[i]*a[j];
long long o2=a[i]*a[j];
if(o!=o2){
cout<<"long long int";
return 0;
}
}
}
cout<<"int";
return 0;
}
```
**全部AC**
by plj198365 @ 2024-01-14 17:58:19