View Code of Problem 91

    #include <iostream>
    #include <cstdio>
    #include <cmath>
    using namespace std;
    int main(){
        int n;
        cin>>n;
        cout<<n<<"=";
        for(int i=2;i<=sqrt(n);i++){
            if(n%i==0){
                cout<<i<<"*";
                n=n/i;
                i--;
            }
        }
        cout<<n<<endl;
        return 0;
    }