题解 | 删除字符串中出现次数最少的字符

#include <algorithm>
#include <iostream>
#include <string>
#include <map>
using namespace std;

int main() {
    string s;
    cin >> s;
    map<char, int> strMap;
    map<char, int>::iterator iter;
    for (auto ch: s) {
        iter = strMap.find(ch);
        if (iter == strMap.end()) {
            strMap[ch] = 1;
        } else {
            ++ iter->second;
        }
    }

    int miniCount = s.length();
    for (auto it: strMap) {
        miniCount = min(miniCount, it.second);
    }
    for (auto ch: s) {
        iter = strMap.find(ch);
        if (iter->second > miniCount) {
            cout << ch;
        }
    }
}
// 64 位输出请用 printf("%lld")