请帮帮忙讲下大学C++基础的题

Question

Answer 1

 #include<iostream>
#include<string>

using namespace std;

int main()
{

    int len;
    cin >> len;
    string str[len];

    for(int i = 0;i<len;i++)
    {
        cin >> str[i];
    }


    for(int j = 0;j<len;j++)
    {
        int strLenfont = str[j].size();

        for(int k = j+1;k<=len-1;k++){
            int strLennext = str[k].size();
            if(strLenfont>strLennext){
                str[j].swap(str[k]); 
            }
        }
    }

    for(int f = len-1;f>=0;f--){
        cout << str[f] << endl;
    }



}