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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. const int MAX_LENGTH = 100000;
  5.  
  6. int main() {
  7.     int n, v[MAX_LENGTH + 1], sum_even_no = 0, sum_odd_no = 0;
  8.     cin >> n;
  9.     for (int i = 1; i <= n; ++i) {
  10.         cin >> v[i];
  11.     }
  12.     int i = 1;
  13.     while (i <= n) {
  14.         if (i % 2 == 0) {
  15.             sum_even_no += v[i];
  16.         } else {
  17.             sum_odd_no += v[i];
  18.         }
  19.         ++i;
  20.     }
  21.     cout << sum_even_no - sum_odd_no;
  22.     return 0;
  23. }
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/qhyWGR
language:
C++ (gcc 8.3)
created:
78 days ago
visibility:
public

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