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原创 208. Implement Trie (Prefix Tree)

208. Implement Trie (Prefix Tree)MediumImplement a trie with insert, search, and startsWith methods.Example:Trie trie = new Trie();trie.insert("apple");trie.search("apple"); // returns t...

2019-01-26 22:17:36 248

原创 201. Bitwise AND of Numbers Range

201. Bitwise AND of Numbers RangeMediumGiven a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive.Example 1:Input: [5,7]Out...

2019-01-24 18:45:47 253

原创 200. Number of Islands

200. Number of IslandsMediumGiven a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontal...

2019-01-24 16:33:07 219

原创 596. Classes More Than 5 Students

596. Classes More Than 5 StudentsEasy132344FavoriteShareSQL SchemaThere is a table courses with columns: student and classPlease list out all classes which have more than or equal to 5 stude...

2019-01-24 10:46:29 153

原创 626. Exchange Seats

626. Exchange SeatsMedium135126FavoriteShareSQL SchemaMary is a teacher in a middle school and she has a table seat storing students' names and their corresponding seat ids.The column id is ...

2019-01-24 10:44:56 442

原创 262. Trips and Users

262. Trips and UsersHard158116FavoriteShareSQL SchemaThe Trips table holds all taxi trips. Each trip has a unique Id, while Client_Id and Driver_Id are both foreign keys to the Users_Id at the...

2019-01-24 10:43:10 181

原创 142. Linked List Cycle II

142. Linked List Cycle IIMediumGiven a linked list, return the node where the cycle begins. If there is no cycle, return null.To represent a cycle in the given linked list, we use an integer pos...

2019-01-22 11:33:20 135

原创 173. Binary Search Tree Iterator

173. Binary Search Tree IteratorMediumImplement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST.Calling next() will return the next sma...

2019-01-22 11:16:15 138

原创 892. Surface Area of 3D Shapes

892. Surface Area of 3D ShapesEasyOn a N * N grid, we place some 1 * 1 * 1 cubes.Each value v = grid[i][j] represents a tower of v cubes placed on top of grid cell (i, j).Return the total surf...

2019-01-17 15:18:02 112

原创 162. Find Peak Element

162. Find Peak ElementMedium6561047FavoriteShareA peak element is an element that is greater than its neighbors.Given an input array nums, where nums[i] ≠ nums[i+1], find a peak element and re...

2019-01-17 10:45:59 99

原创 165. Compare Version Numbers

165. Compare Version NumbersMedium223973FavoriteShareCompare two version numbers version1 and version2.If version1 > version2 return 1; if version1 <version2 return -1;otherwise return 0....

2019-01-17 00:00:21 118

原创 187. Repeated DNA Sequences

187. Repeated DNA SequencesMedium358142FavoriteShareAll DNA is composed of a series of nucleotides abbreviated as A, C, G, and T, for example: "ACGAATTCCG". When studying DNA, it is sometimes us...

2019-01-16 22:53:21 130

原创 209. Minimum Size Subarray Sum

209. Minimum Size Subarray SumMedium87660FavoriteShareGiven an array of n positive integers and a positive integer s, find the minimal length of a contiguous subarray of which the sum ≥ s. If th...

2019-01-16 17:40:21 94

原创 153. Find Minimum in Rotated Sorted Array

153. Find Minimum in Rotated Sorted ArrayMedium751133FavoriteShareSuppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand.(i.e., [0,1,2,4,5,6,7] might be...

2019-01-16 14:32:27 105

原创 150. Evaluate Reverse Polish Notation

150. Evaluate Reverse Polish NotationMedium414303FavoriteShareEvaluate the value of an arithmetic expression in Reverse Polish Notation.Valid operators are +, -, *, /. Each operand may be an i...

2019-01-16 14:01:56 108

原创 260. Single Number III

260. Single Number IIIMedium69566FavoriteShareGiven an array of numbers nums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two element...

2019-01-16 12:56:58 124

原创 147. Insertion Sort List

147. Insertion Sort ListMedium274332FavoriteShareSort a linked list using insertion sort.A graphical example of insertion sort. The partial sorted list (black) initially contains only the fir...

2019-01-16 11:06:54 170

原创 143. Reorder List

143. Reorder ListMedium66755FavoriteShareGiven a singly linked list L: L0→L1→…→Ln-1→Ln,reorder it to: L0→Ln→L1→Ln-1→L2→Ln-2→…You may not modify the values in the list's nodes, only nodes itse...

2019-01-15 23:34:03 215

原创 137. Single Number II

137. Single Number IIMedium655224FavoriteShareGiven a non-empty array of integers, every element appears three times except for one, which appears exactly once. Find that single one.Note:You...

2019-01-15 20:43:07 290

原创 138. Copy List with Random Pointer

138. Copy List with Random PointerMediumA linked list is given such that each node contains an additional random pointer which could point to any node in the list or null.Return a deep copy of t...

2018-12-22 20:46:33 91

原创 179. Largest Number

179. Largest NumberMediumGiven a list of non negative integers, arrange them such that they form the largest number.Example 1:Input: [10,2]Output: "210"Example 2:Input: [3,30,34,5,9]Ou...

2018-12-22 15:31:57 93

原创 131. Palindrome Partitioning

131. Palindrome PartitioningMediumGiven a string s, partition s such that every substring of the partition is a palindrome.Return all possible palindrome partitioning of s.Example:Input: "a...

2018-12-22 13:09:36 99

原创 130. Surrounded Regions

130. Surrounded RegionsMediumGiven a 2D board containing 'X' and 'O' (the letter O), capture all regions surrounded by 'X'.A region is captured by flipping all 'O's into 'X's in that surrounded ...

2018-12-20 16:41:59 164

原创 959. Regions Cut By Slashes

959. Regions Cut By SlashesMediumIn a N x N grid composed of 1 x 1 squares, each 1 x 1 square consists of a /, \, or blank space. These characters divide the square into contiguous regions.(Not...

2018-12-20 16:04:07 217

原创 114. Flatten Binary Tree to Linked List

114. Flatten Binary Tree to Linked ListMediumGiven a binary tree, flatten it to a linked list in-place.For example, given the following tree: 1 / \ 2 5 / \ \3 4 6The flat...

2018-12-20 13:21:51 106

原创 113. Path Sum II

113. Path Sum IIMediumGiven a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum.Note: A leaf is a node with no children.Example:Given the below bi...

2018-12-19 23:34:47 130

原创 95. Unique Binary Search Trees II

95. Unique Binary Search Trees IIMediumGiven an integer n, generate all structurally unique BST's (binary search trees) that store values 1 ... n.Example:Input: 3Output:[ [1,null,3,2], ...

2018-12-19 22:18:14 102

原创 133. Clone Graph

133. Clone GraphMediumGiven the head of a graph, return a deep copy (clone) of the graph. Each node in the graph contains a label (int) and a list (List[UndirectedGraphNode]) of its neighbors. The...

2018-12-18 18:00:32 92

原创 106. Construct Binary Tree from Inorder and Postorder Traversal

106. Construct Binary Tree from Inorder and Postorder TraversalMediumGiven inorder and postorder traversal of a tree, construct the binary tree.Note:You may assume that duplicates do not exist ...

2018-12-16 18:08:27 100

原创 105. Construct Binary Tree from Preorder and Inorder Traversal

105. Construct Binary Tree from Preorder and Inorder TraversalMediumGiven preorder and inorder traversal of a tree, construct the binary tree.Note:You may assume that duplicates do not exist in...

2018-12-16 17:43:53 133

原创 96. Unique Binary Search Trees

96. Unique Binary Search TreesMediumGiven n, how many structurally unique BST's (binary search trees) that store values 1 ... n?Example:Input: 3Output: 5Explanation:Given n = 3, there are ...

2018-12-16 14:50:39 79

原创 56. Merge Intervals

56. Merge IntervalsMediumGiven a collection of intervals, merge all overlapping intervals.Example 1:Input: [[1,3],[2,6],[8,10],[15,18]]Output: [[1,6],[8,10],[15,18]]Explanation: Since inter...

2018-12-15 21:39:56 107

原创 81. Search in Rotated Sorted Array II

81. Search in Rotated Sorted Array IIMediumSuppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand.(i.e., [0,0,1,2,2,5,6] might become [2,5,6,0,0,1,2]).Yo...

2018-12-15 19:57:36 105

原创 931. Minimum Falling Path Sum

931. Minimum Falling Path SumMediumGiven a square array of integers A, we want the minimum sum of a falling path through A.A falling path starts at any element in the first row, and chooses one ...

2018-11-11 16:31:40 200

原创 938. Range Sum of BST

938. Range Sum of BSTMediumGiven the root node of a binary search tree, return the sum of values of all nodes with value between L and R (inclusive).The binary search tree is guaranteed to have ...

2018-11-11 16:06:43 251

原创 701. Insert into a Binary Search Tree

701. Insert into a Binary Search TreeMediumGiven the root node of a binary search tree (BST) and a value to be inserted into the tree, insert the value into the BST. Return the root node of the BS...

2018-11-11 15:48:41 163

原创 695. Max Area of Island

695. Max Area of IslandMediumGiven a non-empty 2D array grid of 0's and 1's, an island is a group of 1's (representing land) connected 4-directionally (horizontal or vertical.) You may assume all ...

2018-11-11 15:21:36 212

转载浏览器内部工作原理

https://www.html5rocks.com/en/tutorials/internals/howbrowserswork/ http://kb.cnblogs.com/page/129756/

2017-05-13 19:23:08 218

原创 344. Reverse String

Write a function that takes a string as input and returns the string reversed.Example:Given s = "hello", return "olleh".Subscribe to see which companies asked this question.Java Code:p

2017-05-02 22:50:57 176

原创 94. Binary Tree Inorder Traversal

Given a binary tree, return the inorder traversal of its nodes' values.For example:Given binary tree [1,null,2,3], 1 \ 2 / 3return [1,3,2].Note: Recursive solution is tr

2017-04-29 23:02:04 152

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