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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     // input
  6.     int n;
  7.     cin >> n;
  8.  
  9.     // process
  10.     long long sum = 0;
  11.     for (int i = 0; i <= n; i++) {
  12.         if (i % 2 != 0) { // Kiểm tra số lẻ
  13.             sum = sum + i;
  14.         }
  15.     }
  16.  
  17.     // output
  18.     cout << sum;
  19.     return 0;
  20. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/w9YYGP
language:
C++ (gcc 8.3)
created:
11 hours ago
visibility:
public

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