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  1. #include <iostream>
  2. #include <vector>
  3. #include <math.h>
  4. using namespace std;
  5.  
  6. void prime(vector<int>& A){
  7. 	int n = A.size();
  8. 	for(int i=2;i<sqrt(n);i++){
  9. 		if(A[i]==0)continue;
  10. 		for(int j=i*i;j<=n;j+=i){
  11. 			A[j]=0;
  12. 		}
  13. 	}
  14. }
  15.  
  16. int main() {
  17. 	// your code goes here
  18. 	vector<int> A(10000,1);
  19.  
  20. 	prime(A);
  21. 	int temp = 0;
  22. 	for(int i=2;i<A.size();i++)
  23. 		if(A[i]==1){
  24. 			// cout << i << endl;
  25. 			temp++;
  26. 		}
  27. 	cout << temp;
  28. 	return 0;
  29. }
Success #stdin #stdout 0s 4392KB
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https://ideone.com/wVazHO
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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