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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	// your code goes here
  6. 	int arr[1003003], i, j;							
  7. 	for(int k=0; k<1003003; k++) arr[k]=true;
  8. 	arr[0]=arr[1]=false;
  9. 	for(i=2; i*i<=1003003; i++) { 					
  10. 		if(!arr[i]) continue;					//doesnt execute the inner loop if "i" is
  11. 		for(j=i*i; j<=1003003; j=j+i) {			// false, or not prime
  12. 			arr[j]=false;		//all multiples of "i" are assigned "false", or not prime
  13. 		}
  14. 	}
  15. 	return 0;
  16. }
Success #stdin #stdout 0.02s 7124KB
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https://ideone.com/exSigi
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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