@[_Daybreak](/user/90972) <https://www.luogu.com.cn/record/43018079>
```cpp
#include <bits/stdc++.h>
using namespace std;
int main() {
int n; cin >> n;
cout << 1ll * n * n << endl;
return 0;
}
```
这样？
by Le_temps_des_fleurs @ 2020-12-02 14:51:35