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【leetcode】Longest Consecutive Sequence

Question ：  Given an unsorted array of integers, find the length of the longest consecutive elements sequence.For example,Given [100, 4, 200, 1, 3, 2],The longest consecutive elements sequence is [1, 2, 3, 4]. Return its length: 4.Your algorithm

【leetcode】Letter Combinations of a Phone Number

Question ： Given a digit string, return all possible letter combinations that the number could represent.A mapping of digit to letters (just like on the telephone buttons) is given below.Input:Digit string "23"Output: ["ad", "ae", "af", "bd", "be", "

【leetcode】Binary Tree Maximum Path Sum

Question ：  Given a binary tree, find the maximum path sum.The path may start and end at any node in the tree.For example:Given the below binary tree, 1 / \ 2 3Return 6.Anwser 1 ：    /** * Definition for binary tree * struct

【leetcode】Valid Parentheses

Question ：  Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]" and "([)]" are not.Anwser 1 ：   

【leetcode】Longest Valid Parentheses

Question：Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring.For "(()", the longest valid parentheses substring is "()", which has length = 2.Another example is ")()())",

【leetcode】Balanced Binary Tree

Question ： Given a binary tree, determine if it is height-balanced.For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node never differ by more than 1.Anwser 1 ：       /** *

js 函數function用法

javascript 函數不同於其他的語言，每個函數都是作為一個對象被維護和啟動並執行。通過函數對象的性質，可以很方便的將一個函數賦值給一個變數或者將函數作為參數傳遞。在繼續講述之前，先看一下函數的使用文法：以下是引用片段：function func1(…){…}  var func2=function(…){…};  var func3=function func4(…){…};  var func5=new Function();   <script

【leetcode】Binary Tree Level Order Traversal II

Question ： Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by level from leaf to root).For example:Given binary tree {3,9,20,#,#,15,7}, 3 / \ 9 20 / \ 15 7return its

【leetcode】Flatten Binary Tree to Linked List

Question ： Given a binary tree, flatten it to a linked list in-place.For example,Given 1 / \ 2 5 / \ \ 3 4 6The flattened tree should look like: 1 \ 2 \ 3 \ 4 \

【leetcode】Binary Tree Level Order Traversal

Question ：Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level).For example:Given binary tree {3,9,20,#,#,15,7}, 3 / \ 9 20 / \ 15 7return its level order traversal as:[ [

賬戶管理命令 useradd、groupadd

內容提要：1. 掌握使用者的 增/刪/改 命令2. 掌握組的 增/刪/改 命令組管理1）groupaddgroupadd 用於添加組帳號。格式如下：groupadd [-g GID] GROUP其中： GROUP：是要添加的組名  -g：用於指定 GID，預設為使用當前最大的 GID 加1舉例： 添加一個新組 leader# groupadd leader# grep leader /etc/groupleader:x:504:# grep leader /etc/gshadowleader:!

【leetcode】Binary Tree Inorder Traversal

Question ： Given a binary tree, return the inorder traversal of its nodes' values.For example:Given binary tree {1,#,2,3}, 1 \ 2 / 3return [1,3,2].Note: Recursive solution is trivial, could you do it iteratively?confused what "{1,#,2,3}

【leetcode】String to Integer (atoi)

Question ：Implement atoi to convert a string to an integer.Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible input cases.Notes: It is intended for this problem

【leetcode】Palindrome Partitioning II

Question ： Given a string s, partition s such that every substring of the partition is a palindrome.Return the minimum cuts needed for a palindrome partitioning of s.For example, given s = "aab",Return 1 since the palindrome

【leetcode】Zigzag Conversion

Question ： The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)P A H NA P L S I I GY I RAnd then read line by

【leetcode】Surrounded Regions

Question ：Given a 2D board containing 'X' and 'O', capture all regions surrounded by 'X'.A region is captured by flipping all 'O's into 'X's in that surrounded region .For example,X X X XX O O XX X O XX O X XAfter running your function, the board

jQuery Datepicker 日期外掛程式

Datepicker日期選擇外掛程式是一個配置靈活的外掛程式，可以自訂其展示方式，包括日期格式、語言、限制選擇日期範圍、添加相關按鈕以及其它導航等。1、jQuery Datepicker範例程式碼：<!doctype html><html lang="en"><head> <meta charset="utf-8" /> <title>jQuery UI Datepicker - Default functionality</

【leetcode】Maximum Depth of Binary Tree

Question ：Given a binary tree, find its maximum depth.The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.Anwser 1 ：  DFS/** * Definition for binary tree * struct TreeNode { * int val;

【leetcode】Construct Binary Tree from Preorder and Inorder Traversal

Question：  Given preorder and inorder traversal of a tree, construct the binary tree.Note:You may assume that duplicates do not exist in the tree.Anwser 1 ：      /** * Definition for binary tree * struct TreeNode { * int val; * TreeNode

【leetcode】Construct Binary Tree from Inorder and Postorder Traversal

Question： Given inorder and postorder traversal of a tree, construct the binary tree.Note:You may assume that duplicates do not exist in the tree.Anwser 1 ：   /** * Definition for binary tree * struct TreeNode { * int val; * TreeNode

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