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: 54ms
Memory: 1748kB
In contest: 1276

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<string>
#include<cstring>
#include<map>
#include<queue>
#include<vector>
#include<algorithm>
using namespace std;
const int maxn=1010;
typedef long long ll;
int a[maxn];
int sum[maxn];
int main(){
	memset(a,0,sizeof(a));
	a[2]=1;
	int flag=0;
	for(int i=3;i<=1000;i++){
		flag=0;
		for(int j=2;j<=sqrt((double)i);j++){
			if(i/j*j==i){
				flag=1;
				break;
			}
		}
		if(flag==0)
			a[i]=1;
	}
	sum[1]=0;
	for(int i=2;i<=1000;i++){
		if(a[i]==1){
			sum[i]=sum[i-1]+1;
		}
		else{
			sum[i]=sum[i-1];
		}
	}
	int t;
	scanf("%d",&t);
	while(t--){
		int n;
		scanf("%d",&n);
		printf("%d\n",sum[n]);
	}
	return 0;
}