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  1. #include <ctime>
  2. #include <iostream>
  3.  
  4. int PE1(int N = 1000){
  5.      int T=(N-1)/3, F=(N-1)/5, X=(N-1)/15;
  6.      return 3*T*(T+1)/2 + 5*F*(F+1)/2 - 15*X*(X+1)/2;
  7. }
  8.  
  9. int main(){    
  10.     const int iterations = 200000000;
  11.     int ans;
  12.     clock_t start = clock();
  13.     for(int i=0; i<iterations; ++i)
  14.         ans += PE1(i);
  15.     clock_t stop = clock();
  16.     std::cout << ans << "\t" << (double(stop-start)/iterations);
  17. }
Success #stdin #stdout 2.8s 2928KB
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Standard input is empty
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675845978	0.014
https://ideone.com/r8c0Sp
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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