103 / 103 个通过测试用例
状态:通过
执行用时:8 ms
内存消耗:36.3 MB
提交时间:6 月,3 周之前
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 = expandAroundCenter(s, i, i);int len2 = expandAroundCenter(s, i, i + 1);int len = Math.max(len1, len2);if (len > end - start) {start = i - (len - 1) / 2;end = i + len / 2;}}return s.substring(start, end + 1);
}private int expandAroundCenter(String s, int left, int right) {int L = left, R = right;while (L >= 0 && R < s.length() && s.charAt(L) == s.charAt(R)) {L--;R++;}return R - L - 1;
}
}