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Manacher算法--O(n)内求回文子串
昨天做了leetcode里的     Longest Palindromic Substring ,一开始用动态规划O(N^2),不管怎么改都超时了。。。于是在大神的帮助下,找到了传说中的Manacher算法,居然能在O(n)内求出来,瞬间给跪了。 本屌认为,这个算法主要是充分的利用了以前的匹配的结果,来起到了降低时间复杂度的作用,这点跟KMP算是有点类似。在预处理时有个小技巧就是将第0,1为设...
分类:其他好文   时间:2014-06-20 12:15:22    阅读次数:305
Construct Binary Tree from Preorder and Inorder Traversal
题目 Given preorder and inorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in the tree. 方法 根据树的中序遍历和前序遍历,来构造树,使用递归的思想。 Tre...
分类:其他好文   时间:2014-06-20 12:14:49    阅读次数:262
Convert Sorted Array to Binary Search Tree
题目 Given an array where elements are sorted in ascending order, convert it to a height balanced BST. 方法 数组是有序的,要求创建的二叉树尽量平衡,很容易想到对数组进行二分操作,左边的数组元素是左子树,右边的数组元素是右子树。进行递归操作就可以了。 TreeNode...
分类:其他好文   时间:2014-06-20 11:06:46    阅读次数:257
Convert Sorted List to Binary Search Tree
题目 Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. 方法 和有序数组的思想基本一样,将链表进行二分。 TreeNode getBST(ListNode head, int len) { i...
分类:其他好文   时间:2014-06-20 09:46:33    阅读次数:267
Construct Binary Tree from Inorder and Postorder Traversal
题目 Given inorder and postorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in the tree. 方法 根据树的中序遍历和后序遍历,来恢复树,使用递归的思想。 Tr...
分类:其他好文   时间:2014-06-07 14:50:37    阅读次数:231
LeetCode: Populating Next Right Pointers in Each Node [116]
【题目】 Given a binary tree struct TreeLinkNode { TreeLinkNode *left; TreeLinkNode *right; TreeLinkNode *next; } Populate each next pointer to point to its next right node. If there is no next right node, the next pointer should be...
分类:其他好文   时间:2014-06-07 14:28:36    阅读次数:215
[leetcode]Valid Sudoku @ Python
原题地址:https://oj.leetcode.com/problems/valid-sudoku/题意:Determine if a Sudoku is valid, according to:Sudoku Puzzles - The Rules.The Sudoku board could b...
分类:编程语言   时间:2014-06-07 11:26:18    阅读次数:296
LeetCode:Next Permutation
题目链接Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers.If such arrangement is not pos...
分类:其他好文   时间:2014-06-07 11:10:30    阅读次数:212
[leetcode]Sudoku Solver @ Python
原题地址:https://oj.leetcode.com/problems/sudoku-solver/题意:Write a program to solve a Sudoku puzzle by filling the empty cells.Empty cells are indicated b...
分类:编程语言   时间:2014-06-07 09:30:06    阅读次数:342
【LeetCode】Partition List
Partition ListGiven a linked list and a valuex, partition it such that all nodes less thanxcome before nodes greater than or equal tox.You should pres...
分类:其他好文   时间:2014-06-07 06:24:57    阅读次数:179
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