HJ32 密码截取

题目：

HJ32 密码截取

题解：

1. 暴力截取所有子串
2. 利用双指针判断子串是否为回文串
3. 获取最大长度回文串

    public int interceptPassword(String password) {
        int maxLength = -100;
        for (int i = 0; i < password.length();i++) {
            for (int j = i+1; j <= password.length();j++) {
                if (isValid(password.substring(i, j))) {
                    maxLength = Math.max(maxLength, (j-i));
                }
            }
        }

        return maxLength;
    }

    public boolean isValid(String s) {
        char[] chars = s.toCharArray();
        for (int i = 0, j = s.length() - 1; i < chars.length; i++, j--) {
            if (chars[i] != chars[j]) {
                return false;
            }
        }
        return true;
    }

时间复杂度：O()