Result: Accepted
Time: 53ms
Memory: 1792kB
#include<iostream>
#include<cmath>
#include<set>
#include<map>
#include<algorithm>
#include<queue>
#include<cstring>
#include<string>
#include<vector>
#include<cstdio>
#define INF 0x3f3f3f3f
using namespace std;
int number[10005];
int p[10005];
void isprime()
{
int t=0;
int prime[10005];
int i,j,c=0;
memset(number,true,sizeof(number));
for(i=2;i<=10005;i++)
{
if(number[i])
prime[c++]=i;
for(j=0;j<c&&prime[j]*i<=10005;j++)
{
number[prime[j]*i]=false;
if(i%prime[j]==0)
break;
}
}
}
int main(){
isprime();
p[1]=0;
for(int i=2;i<=1005;i++){
if(number[i])
p[i]=p[i-1]+1;
else
p[i]=p[i-1];
}
int n;
scanf("%d",&n);
int tt=0;
while(n--){
scanf("%d",&tt);
printf("%d\n",p[tt]);
}
return 0;
}