【Luogu3383】【模板】线性筛素数

problem

• 给定一个范围N
• 回答M个某数字是否为质数的询问（M

solution

codes

#include<iostream>
#define maxn 10000010
using namespace std;
int pri[maxn];
int main(){
    int n, m;  cin>>n>>m;
    pri[1] = 1;
    for(int i = 2; i*i <= n; i++)
        if(!pri[i])
            for(int j = 2*i; j <= n; j += i)
                pri[j] = 1;
    for(int i = 1; i <= m; i++){
        int x;  cin>>x;
        if(!pri[x])cout<<"Yes
";
        else cout<<"No
";
    }
    return 0;
}