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  1. # include <bits/stdc++.h>
  2. using namespace std ;
  3.  
  4. # define ll long long
  5. # define fs first
  6. # define sc second
  7. # define pll pair<long, long>
  8. # define pii pair<int, int>
  9.  
  10. int main() {
  11.     ll int n, s ;
  12.     cin >> n ;
  13.     while ( n-- ) {
  14.         cin >> s ;
  15.         cout << pow(s+1, 2)  - 1 << "\n" ; // 計算後的公式，記得分子分母同乘( a^2 - b^2 = (a - b)(a + b) )
  16.     }
  17.     return 0 ;
  18. }
  19.  
Success #stdin #stdout 0s 5284KB
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https://ideone.com/vdvgsL
language:
C++ (gcc 8.3)
created:
6 hours ago
visibility:
public

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