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  1. #include <bits/stdc++.h>
  2. #define endl "\n"
  3. using namespace std;
  4. typedef long long ll;
  5. const int mod = 1e9 + 7;
  6.  
  7. ll result(ll n, ll k){
  8. 	ll d = n / k; 
  9. 	ll r = n % k; 
  10. 	ll sum1 = (k-1) * k / 2; 
  11. 	ll sum2 = (r + 1) * r / 2; 
  12. 	return d * sum1 + sum2;
  13. }
  14.  
  15. int main(){
  16. 	int t;
  17. 	cin >> t;
  18. 	while(t--){
  19. 		ll n, k;
  20. 		cin >> n >> k;
  21. 		cout << result(n,k) << endl;
  22. 	}
  23. }
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/GAiecw
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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