题解 | #删除字符串中出现次数最少的字符#

#include<bits/stdc++.h>
using namespace std;

int main() {
    string s;
    cin >> s;
    vector<int> arr(26, 0);
    int len = s.size();
    for (int i = 0; i < len; i++) {
        arr[s[i] - 'a'] += 1;
    }
    int min = 20;
    for (int i = 0; i < 26; i++) {
        if (arr[i] != 0 && arr[i] < min) {
            min = arr[i];
//             cout << min;
        }
    }
//     cout << min;
    for (int i = 0; i < len; i++) {
        if (arr[s[i] - 'a'] > min) {
            cout << s[i];
        }
    }
}