小红的双生串

实现代码：

 public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String s = scanner.next();
        int n = s.length();
        int m = n / 2;

        int[] count1 = new int[26]; // 前半部分
        int[] count2 = new int[26]; // 后半部分

        for (int i = 0; i < m; i++) {
            count1[s.charAt(i) - 'a']++;
        }
        for (int i = m; i < n; i++) {
            count2[s.charAt(i) - 'a']++;
        }

        int maxSame = 0;
        for (int a = 0; a < 26; a++) {
            for (int b = 0; b < 26; b++) {
                maxSame = Math.max(maxSame, count1[a] + count2[b]);
            }
        }

        System.out.println(n - maxSame);
    }