题解

12行搞定！！！

#include <bits/stdc++.h>
using namespace std;
bool b(int n) {
    if (n < 2) return 0;
    for (int i = 2 ; i * i <= n; i++) if (n % i == 0) return 0;
    return 1;  
}
int main() {
    int n;
    cin >> n;        
    for (int i = 1;i <= n;i++) if (b(i)) cout << i << " ";
}
//简单的题就要写装一点

https://www.acgo.cn/application/1955587765123280896求进团！！！