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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.  
  6. 	long long sum = 0;
  7.     for (long long i=1; i <= 1000000000; i++)
  8.     {
  9.         sum += i;
  10.     }
  11.  
  12.     cout << sum << endl;
  13.  
  14.     cout << ((1000000000LL)*(1000000000LL + 1)) / 2;
  15. 	return 0;
  16. }
Success #stdin #stdout 1.31s 3340KB
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stdin
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Standard input is empty
stdout
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500000000500000000
500000000500000000
https://ideone.com/EogEMQ
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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