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  1. #include<iostream>
  2. #include<vector>
  3. #define ll long long
  4.  
  5. using namespace std;
  6.  
  7. int main()
  8. {
  9. ios_base::sync_with_stdio(0);
  10. cin.tie(0);
  11. ll n,t;
  12.  
  13. vector <ll> prime(1000000+1,0);
  14. for(int i=3;i<=1000000;i+=2) // odd number have the potential to be a prime no.
  15. prime[i]=1;
  16. for(int i=3;i*i<=1000000;i++) // checking for prime and composite
  17. {
  18. if(prime[i]==1)
  19. {
  20. for(ll j=i*i;j<=1000000;j+=i)
  21. prime[j]=0;
  22. }
  23. }
  24. prime[1]=prime[0]=0;
  25. prime[2]=1;
  26. cin>>t;
  27.  
  28. while(t--){
  29. cin>>n;
  30. int count=0;
  31. for(int i=0;i<=n;i++)
  32. {
  33. if(prime[i]==1)
  34. {
  35. if(i%10!=0)
  36. count++;
  37. }
  38. }
  39. cout<<count<<"\n";
  40. }
  41. return 0;
  42. }
  43.  
  44.  
Runtime error #stdin #stdout 0.01s 11108KB
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