C++ 代码

#include <iostream>
#include <cstring>
#include <cstdio>
#include <algorithm>

using namespace std;

int main()
{
    string str;
    cin >> str;
    for(int i = 0 ; i < str.size() ; i ++ )
    {
        if(str[i] >= 'a' && str[i] <= 'z' || str[i] >= 'A' && str[i] <= 'Z')
        {
            if(str[i + 1] > '1' && str[i + 1] <= '9')
              {
               for(int j = 0 ; j <= str[i + 1] - '1'; j ++ )
                 printf("%c",str[i]);
               }
        else
            printf("%c",str[i]);
        }
    }

    return 0;
}