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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define SIZE 10000
  5. vector <int> prime;
  6. char stat[SIZE];
  7. int Sieve(int x){
  8. 	int i,j;
  9. 	int s=sqrt(x);
  10. 	prime.push_back(2);
  11. 	for(i=3;i<=s;i++){
  12. 		if(stat[i]==0){
  13. 			for(j=i*i;j<=x;j++){
  14. 				stat[j]==1;
  15. 			}
  16. 		}
  17. 	}
  18. 	for(i=3;i<=x;i++){
  19. 	   if(stat[i]==0){
  20. 	    	prime.push_back(i);
  21. 	    	cout<<i;
  22. 	   }
  23. 	}
  24. }
  25.  
  26. int main() {
  27. 	int n;
  28. 	while(scanf("%d",&n)!=EOF){
  29. 		Sieve(n);
  30. 	}
  31. 	return 0;
  32. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/XBqQN8
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

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