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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main() {
  6.     ios_base::sync_with_stdio(false);
  7.     cin.tie(NULL);
  8.     long long n, m;
  9.             cin >> n >> m;
  10.             cout << (n * (n - 1) / 2) * (m * (m - 1) / 2) << "\n";
  11.     return 0;
  12. }
Success #stdin #stdout 0.01s 5292KB
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https://ideone.com/hHSc0I
language:
C++14 (gcc 8.3)
created:
8 hours ago
visibility:
public

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