题解 | 小红的双生串

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 s = in.nextLine();
        int a = max(s.substring(0, s.length() / 2));
        int b = max(s.substring(s.length() / 2));
        System.out.println(a + b);
    }


    public static int max(String s) {
        int[] arr = new int[26];
        for (int i = 0; i < s.length(); i++) {
            int k = s.charAt(i) - 'a';
            arr[k]++;
        }

        int max = -1;
        for (int i = 0; i < 26; i++) {
            if (arr[i] > max) {
                max = arr[i];
            }
        }
        return s.length() - max;
    }
}