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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int main() {
  4.     ios::sync_with_stdio(false);
  5.     cin.tie(0), cout.tie(0);
  6.     long long n,m,sum=0; cin >> n >> m;
  7.     for(int i=1,cur=1;i<=m;i++) {
  8.         if(i%2!=0) sum+=cur;
  9.         else sum+=n-cur+1, cur++;
  10.     }
  11.     cout << sum;
  12.     return 0;
  13. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/lK4pz9
language:
C++ (gcc 8.3)
created:
8 days ago
visibility:
public

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