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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	long a, b, n, S;
  6. 	cin >> a >> b;
  7. 	n = b - a + 1;
  8. 	S = (a + b) * n / 2;
  9. 	cout << S;
  10. 	return 0;
  11. }
Success #stdin #stdout 0s 15232KB
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478 653
stdout
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99528
https://ideone.com/gfiMnD
[2860] Сумма чисел на промежутке
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
secret

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