SPOJ TDKPRIME - Finding the Kth Prime

N:B: Use bool type vector to store status as upper limit is 10^8






#include <bits/stdc++.h>
using namespace std;
#define n 100000000
vector<bool> a(100000000,true);
long long int p[n],k=1,size;
long long int prime()
{
long long i,j;
a[0]=a[1]=false;
for(i=4;i<=n;i=i+2)
{
a[i]=false;
}
for(i=3;i<=sqrt(n);i=i+2)
{
for(j=i*i;j<=n;j=j+2*i)
{
a[j]=false;
}
}
p[0]=2;
for(i=3;i<=n;i=i+2)
{
if(a[i]==true)
{
p[k]=i;

k++;

}
}


}


int main()
{
long long int t,u,l,w,z;

prime();

cin>>t;
for(l=1;l<=t;l++)
{
cin>>u;
cout<<p[u-1]<<endl;
}

return 0;
}

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