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  1. #include<iostream>
  2. #include<cstdio>
  3. #include<cmath>
  4. using namespace std;
  5. #define     n 163842
  6. int main()
  7. {
  8.     int a[81922];
  9.     int i,j,s,count,k,t;
  10.     cin>>t;
  11.     while(t--)
  12.     {
  13.         count=0;
  14.          cin>>k;
  15.     for(i=2;i<n>>1;i++)
  16.         a[i]=0;
  17.     s=int(sqrt((double )n));
  18.     ///cout<<s;
  19.     for(i=3;i<=s;i+=2)
  20.     {
  21.         if(a[i>>1]==0)
  22.         {
  23.             for( j = i * i; j <= n; j += i + i )
  24.  
  25.             {
  26.                 a[j>>1]=1;
  27.             }
  28.         }
  29.     }
  30.     //cout<<2;
  31.     if(k==1)
  32.         cout<<2<<endl;
  33.         for(i=3;i<=n;i+=2)
  34.     {
  35.         if(a[i>>1]==0)
  36.         {
  37.            ///cout<<"prime="<<i<<endl;
  38.  
  39.            count++;
  40.            if(count==k-1)
  41.            {
  42.                cout<<i<<endl;
  43.                break;
  44.            }
  45.         }
  46.  
  47.  
  48.     }
  49.     //cout<<count;
  50.  
  51.  
  52.     }
  53.  
  54. }
  55.  
Success #stdin #stdout 0s 15432KB
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https://ideone.com/MV23r8
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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