题解 | #质数因子#

#include <iostream>
#include <cmath>
using namespace std;

int main() {
    int a;
    while (cin >> a ) { // 注意 while 处理多个 case
        for(int b = 2; b <= sqrt(a); ++b) {
            while( a % b == 0){
                cout << b << " ";
                a /=b;
            } 
        }
        if(a != 1) cout << a;
    }
}