不用这么麻烦,我18行搞定~
```cpp
#include<bits/stdc++.h>
using namespace std;

int main(){
    int a,b=0;
    cin>>a;
    for (int i = 1;i <= a;i++){
        if (a % i == 0){
            b++;
        }
    }
    if (b > 2 or a == 1){
        cout<<"No";
    }else{
        cout<<"Yes";
    }
    return 0;
}
```



```cpp
#include <iostream>
using namespace std;
int main(){
    int n,i;
    cin >> n;
    bool flag;
    if(n == 2){
        flag = true;
    }else{
        for(i = 2; i <= n - 1; i++){
            if(n % i == 0){
                flag = false;
                break;
            }
        }
        if(i == n){
            flag = true;
        }
    }
    if(flag == true){
        cout << "Yes";
    }else{
        cout << "No";
    }
    return 0;
}
```


搞了半天终于过了！！！

全部评论 1