[编程练习]Longest Palindromic Substring <LeetCode-5>
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Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longest palindromic substring.
题目来自: https://oj.leetcode.com/problems/longest-palindromic-substring/
这一题是求一个字符串(长度<=1000)中最长的回文子串(题目限定只有唯一一个)。难度标注为"Medium"
我想这题也比较简单,思路就是完整扫描,遇到有回文可能的位置开始左右观察。记录最大值。
class Solution: # @return a string def longestPalindrome(self, s): lenstr = len(s) maxlen = 1 maxstart, maxend = 0, 0 #向左向右比较确定是否回文 def scancmp(s, start, end): while ((start - 1 >= 0) and (end + 1 <= lenstr - 1)): if s[start - 1] != s[end + 1]: break start -= 1 end += 1 return start, end for i in range(1, lenstr): #回文形式'aba' if (i < lenstr - 1) and s[i + 1] == s[i - 1]: start, end = scancmp(s, i - 1, i + 1) if (end + 1 - start) > maxlen: maxlen, maxstart, maxend = (end + 1 -start), start, end #回文形式'aa' if s[i] == s[i - 1]: start, end = scancmp(s, i - 1, i) if (end + 1 - start) > maxlen: maxlen, maxstart, maxend = (end + 1 -start), start, end return s[maxstart:maxend + 1]
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