题解 | 质数因子-构思

#include <iostream>
#include <cmath>
using namespace std;
 
int main(){
    long input;
    cin >> input;
    int a = 2;
    while(input != 1)
    {
        if(a>sqrt(input))
        {
            cout << input << " ";
            break;
        }
        while (input % a==0)
        {
            cout << a << " ";
            input /=a;
        }
        a++;
        
    }
    return 0;
}