题解 | #删除字符串中出现次数最少的字符#

#include <iostream>
#include <string>
#include <unordered_map>
#include <vector>
#include <algorithm>

using namespace std;

int main(){
    string str = "";
    cin >> str;
    
    unordered_map<char, int> m;
    for(char c : str){
        m[c]++;
    }
    
    vector<int> tmp;
    for(auto iter = m.begin(); iter != m.end(); iter++){
        tmp.push_back(iter->second);
    }
    sort(tmp.begin(), tmp.end());
    
    string res = "";
    for(char c : str){
        if(m[c] != tmp[0]){
            res += c;
        }
    }
    
    cout << res << endl;
    
    return 0;
}