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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {    // for 25
  5.     double X;
  6.     int N;
  7.     cin >> X >> N;
  8.  
  9.     double S = 0.0;
  10.     double t = X;
  11.     S += t;
  12.  
  13.     for (int k = 2; k <= N; ++k){
  14.         t = -t * X * (double)(k - 1) / k;
  15.     }
  16.     cout << S << endl;
  17.     return 0;
  18. }
Success #stdin #stdout 0.01s 5324KB
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https://ideone.com/Gv1OUn
language:
C++ (gcc 8.3)
created:
6 hours ago
visibility:
public

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