题目地址


#include<cstdio>
#include<iostream>
#include<cmath>
#include<cstring>
using namespace std;
const int MAXN=20000000;
bool isPrime[MAXN],notPrime[MAXN];
void initPrime(int x){
	notPrime[0]=1;
	notPrime[1]=1;
	for(int i=2;i<=sqrt(x);i++){
		if(notPrime[i])continue;
		for(int j=i;j<=x/i;j++){
			notPrime[i*j]=1;
		}
	}
}
int main(){
	int n,m;
	scanf("%d%d",&n,&m);
	initPrime(n);
	for(int i=1;i<=m;i++){
		int val;
		scanf("%d",&val);
		if(notPrime[val])printf("No\n");
		else printf("Yes\n");
	}
	return 0;
}