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  1. #include <iostream>
  2. #include <math.h>
  3. using namespace std;
  4.  
  5. int check(long long n){
  6. 	if(n < 2) return 0;
  7. 	for (long long i = 2; i * i <= n; i++){
  8. 		if(n % i == 0) return 0;
  9. 	}
  10. 	return 1;
  11. }
  12. int main(){
  13. 	ios_base::sync_with_stdio(0);
  14. 	cin.tie(0); cout.tie(0);
  15.  
  16. 	int t;
  17. 	cin >> t;
  18. 	while (t--){
  19. 		long long l, r;
  20. 		cin >> l >> r;
  21. 		int dem = 0;
  22. 		for (long long i = ceil(sqrt(l)); i * i <= r; i++){
  23. 			if(check(i)) dem++;
  24. 		}
  25. 		cout << dem << endl;
  26. 	}
  27. 	return 0;
  28. }
Success #stdin #stdout 0.1s 5284KB
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https://ideone.com/62n8tr
language:
C++ (gcc 8.3)
created:
5 hours ago
visibility:
secret

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