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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main(){
  5.     int n; cin >> n;
  6.     int s = 0;
  7.     for(int i=1; i <= n; i++){
  8.         if(i % 2== 1) s+= i;
  9.         else s -= i;
  10.     }
  11.     cout << s;
  12. }
Success #stdin #stdout 0.01s 5264KB
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stdin
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4
stdout
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-2
https://ideone.com/54RguU
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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