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class Solution {
       public String longestPalindrome(String s) {
           if(s == null || s.length() < 1) {
               return "";        }        int start = 0, end = 0;        for(int i = 0; i < s.length(); i++) {
               int len1 = help(s, i, i);//bab            int len2 = help(s, i, i + 1);//baab            int len = Math.max(len1, len2);            if(len >= end -start + 1) {
   //新长度大于等于就长度就记录下来                //重新计算值                start = i - (len - 1) / 2;                end = i + (len) / 2;            }                    }        return s.substring(start, end + 1);    }    public int help(String s, int left, int right) {
           while(0 <= left && right < s.length() && s.charAt(left) == s.charAt(right)) {
               left--;            right++;        }        return right - left - 1;    }}

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