题解 | 删除字符串中出现次数最少的字符

import java.util.*;

// 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 str = in.next();
        int[] count = new int[26];  //每个字母出现次数
        char[] letter = str.toCharArray();
        for (char c : letter){
            count[c - 'a']++;
        }

        int min = 20;
        for (int i = 0; i < 26; i++) {
            if (count[i] == 0) continue;
            if (count[i] < min) {
                min = count[i];
            }
        
        }
        //跳过最少字符输出
        //只要该字符出现次数不是min就不是最少字符
        for (char c : letter) {
            if (count[c - 'a'] != min) System.out.print(c);
        }
    }
}