题解 | #删除字符串中出现次数最少的字符#

#include <vector>
#include<bits/stdc++.h>

using namespace std;
int main(){
    string str;
    cin >> str;
    //统计字符串
    vector<int> record(26, 0);
    for (char i : str){
        record[i - 'a']++;
    }
    //统计最小
    string minstr = "";
    int minnum = 999;
    for (int i = 0; i < record.size(); i++){
        if (record[i] == 0) continue; //0不统计
        if (record[i] == minnum) {
            minstr += 'a' + i;
        }
        else if (record[i] < minnum) {
            minstr = ('a' + i);
            minnum = record[i];
        }
    }  
    //进行跳过
    for (char i : str){
        if (minstr.find(i) == minstr.npos) cout << i; 
    }
}