题解 | 删除字符串中出现次数最少的字符

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String line = in.next();
        int minCount = -1;
        Map<Character, Integer> map = new HashMap<>();
        for (char c : line.toCharArray()) {
            int count = 1;
            if (map.get(c) != null) {
                count += map.get(c);
            }
            map.put(c, count);
        }

        for (char c : map.keySet()) {
            int v = map.get(c);
            if (minCount == -1) {
                minCount = v;
            }
            if (minCount > v) {
                minCount = v;
            }
        }
        for(char c: map.keySet()){
            if(minCount==map.get(c)){
                line = line.replaceAll(c+"","");
            }
        }
        System.out.println(line);
    }
}