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 <climits>

using namespace std;

int main() {
    string s;
    cin >> s;
    int n = s.size();
    unordered_map<char, int> freq;
    for (char ch : s) {
        freq[ch]++;
    }
    int min_freq = INT_MAX;
    for (auto p : freq) {
        min_freq = min(min_freq, p.second);
    }
    for (char ch : s) {
        if (freq[ch] > min_freq) {
            cout << ch;
        }
    }

    cout << endl;
    return 0;

}