LeetCode -- 5. Longest Palindromic Substring
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题目:
Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000.
Example:
Input: "babad"Output: "bab"Note: "aba" is also a valid answer.
Example:
Input: "cbbd"Output: "bb"
算法思想:
这是一道动态规划题,当然也有更好的算法(著名的manacher(马拉车 :)算法),但是那个难度比较大,像我这样的弱菜第一次听说,基本给出动态规划的解法已经可以了。
定义bool数组d[i][j]为字符串从位置i到位置j是否为回文串。
初始状态:
动态规划的状态转移方程(
C++代码如下:
class Solution {public: string longestPalindrome(string s) { const int strLen = s.size(); int begin = 0,maxLen = 1; bool d[1000][1000] = {false}; for(int i=0;i<strLen;i++) { d[i][i] = true; } for(int i = 0;i<strLen-1;i++) { if(s[i] == s[i+1]) { d[i][i+1] = true; begin = i; maxLen = 2; } } for(int len = 3;len<=strLen;len++) { for(int i = 0;i< strLen-len+1;i++) { int j = i+len-1; if(s[i] == s[j] && d[i+1][j-1] == true) { d[i][j] = true; begin = i; maxLen = len; } } } return s.substr(begin,maxLen); }};
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