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    1. #include <iostream>
    2. #include <string>
    4. using namespace std;
    6. static string str_get;
    7. static string str_change;
    9. void deletChar(string str,char _char,int num)
    10. {
    11.     int flag = 0;
    12.     for(int i = 0;i<num;i++)
    13.     {
    14.         flag = str.find(_char);
    16.         //这里别忘了赋值，否则删除字符无效
    17.         str_change = str.erase(flag,1);
    18.     }
    19. }
    21. int main()
    22. {
    23.     while(cin>>str_get)
    24.     {
    25.         str_change = str_get;
    26.         int word_array[200] = {0};
    27.         int num_least = 20;
    29.         //直接使用字符作为下标
    30.         for(int i = 0;i<str_get.size();i++)
    31.             word_array[str_get[i]]++;
    33.         for(int i = 0;i<str_get.size();i++)
    34.             if(word_array[str_get[i]]<num_least)
    35.                 num_least = word_array[str_get[i]];
    37.         for(int i = 0;i<str_get.size();i++)
    38.             if(word_array[str_get[i]]==num_least)
    39.                 deletChar(str_change,str_get[i],word_array[str_get[i]]);
    41.         cout<<str_change<<endl;
    42.     }
    43. }