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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void executeTime() {
  5.     cerr << "Time Taken: " << (float)clock() / CLOCKS_PER_SEC << " secs";
  6. }
  7.  
  8. int main() {
  9.  
  10.     int n; cin >> n;
  11.  
  12.     vector<int> primes(n + 1, 1);
  13.  
  14.     primes[0] = 0;
  15.     primes[1] = 0;
  16.  
  17.  
  18.     for (int i = 2; i <= sqrt(n); i++) {
  19.         if (primes[i]) {
  20.             for (int j = i * i; j <= n; j += i) {
  21.                 primes[j] = 0;
  22.             }
  23.         }
  24.     }
  25.  
  26.     for (int i = 2; i <= n; i++) {
  27.         if (primes[i]) {
  28.             cout << i << endl;
  29.         }
  30.     }
  31.  
  32.  
  33.  
  34.     executeTime();
  35.     return 0;
  36. }
Success #stdin #stdout #stderr 0s 5324KB
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Time Taken: 0.004079 secs
https://ideone.com/0F6qQZ
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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