题解

#include<bits/stdc++.h>
using namespace std;
int main(){
    string str;
    int n ,count = 0;
    cin >> str >> n;
    while (n){  //重复执行直到n为0
        string _str;
        for (int i = 0 ; i < str.size() ; i = i){
            int j = i;
            while (j < str.size() && str[i] == str[j])
                j++;
            count = j - i;
            _str += to_string(count) + str[i];  //利用to_string函数将count转换成字符串
            i = j;
        }
        n--;
        str = _str;
    }
    cout << str;
}