Start: Jun, 28, 2019 08:42:00
2019杭州师范大学第一届程序设计竞赛新生赛
End: Jun, 28, 2019 11:42:00
Time elapsed:
Time remaining:

Problem_ID: F
Result: Accepted
Time: 53ms
Memory: 1792kB
In contest: 1276


#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;
}