负数乘正数可能爆int下届
by dongrunxuan @ 2023-12-12 19:48:30
Hack:
```
-200000000 1
1 200000000
```
注意下限乘上限也有可能爆 `int`。
by DGH_Didi @ 2023-12-12 19:48:42
加一个 a * d 和 b * c
by dongrunxuan @ 2023-12-12 19:49:19
```cpp
#include<bits/stdc++.h>
using namespace std;
int main(){
long long x1,x2,y1,y2;
cin>>x1>>x2>>y1>>y2;
if(max(x1,x2)*max(y1,y2)>2147483647||max(x1,x2)*max(y1,y2)<-2147483647||min(x1,x2)*min(y1,y2)>2147483647||min(x1,x2)*min(y1,y2)<-2147483647||min(x1,x2)*max(y1,y2)>2147483647||min(x1,x2)*max(y1,y2)<-2147483647||max(x1,x2)*min(y1,y2)>2147483647||max(x1,x2)*min(y1,y2)<-2147483647) cout<<"long long int";
else cout<<"int";
return 0;
}
```
by laozhang_123 @ 2023-12-12 20:43:59