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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.  
  27.     vector<int> count(1000000+1,0);
  28. count[0] = 0;
  29.  for(int i=1;i<=1000000;i++)
  30.     {
  31.         if(prime[i]==1)
  32.         {
  33.             if(i%10!=0)
  34.             count[i]++;
  35.         }
  36.     count[i] += count[i-1];
  37.     }
  38.  
  39.  
  40.      cin>>t;
  41.  
  42.     while(t--){
  43.     cin>>n;
  44.     cout<<count[n]<<"\n";
  45.  
  46. }
  47. return 0;
  48. }
  49.  
  50.  
Runtime error #stdin #stdout 0.02s 15020KB
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https://ideone.com/UJHSoW
problem VECTAR8, based on SPOJ submission 26437334 (CPP14), 2020-08-17 14:16:58
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
secret

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