原创 LeetCode 234. Palindrome Linked List
Given a singly linked list, determine if it is a palindrome. Follow up: Could you do it in O(n) time and O(1) space?
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原创 LeetCode 53. Maximum Subarray
Find the contiguous subarray within an array (containing at least one number) which has the largest sum. For example,
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原创 Leetcode 139, Word Break
Given a string s and a dictionary of words dict, determine if s can be segmented into a space-separated sequence of on
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原创 LeetCode105. Construct Binary Tree from Preorder and Inorder Traversal
Given preorder and inorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do no
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原创 LeetCode 226. Invert Binary Tree
Invert a binary tree. 4 / \ 2 7 / \ / \ 1 3 6 9 to 4 / \ 7 2 / \ / \ 9 6 3
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原创 LeetCode 40. Combination Sum II
Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the ca
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原创 LeetCode 93. Restore IP Addresses
Given a string containing only digits, restore it by returning all possible valid IP address combinations. For exampl
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原创 LeetCode 57. Insert Interval
Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary). You may assu
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原创 LeetCode 129. Sum Root to Leaf Numbers
iven a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. An example is t
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原创 LeetCode 257. Binary Tree Paths
Given a binary tree, return all root-to-leaf paths. For example, given the following binary tree: 1 / \ 2
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原创 LeetCode 27. Remove Element
Given an array and a value, remove all instances of that value in place and return the new length. Do not allocate ex
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原创 LeetCOde 64. Minimum Path Sum
Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right which minimizes the sum
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原创 LeetCode 203. Remove Linked List Elements
Remove all elements from a linked list of integers that have value val. ExampleGiven: 1 --> 2 --> 6 --> 3 --> 4 --> 5
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原创 LeetCode 116. Populating Next Right Pointers in Each Node
Given a binary tree struct TreeLinkNode { TreeLinkNode *left; TreeLinkNode *right; TreeLinkNode
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原创 LeetCode344. Reverse String
Write a function that takes a string as input and returns the string reversed. Example: Given s = "hello", return "ol
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