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keep hungry keep foolish
闲言碎语

Hello

Hello World, Hello Again!

My First Post

Hello World, Hello Blog

JAVA基础

Collections工具类

内部方法的使用

Iterator的使用

用迭代器迭代Collection

TreeSet

TreeSet基本用法，重写Comparable接口

HashSet

HashSet底层实现

HashSet

HashSet的基本用法

TreeMap

TreeMap的使用和底层实现_Comparable接口

HashMap

手动实现HaspMap的常用方法

StringBuilder和StringBuffer

可变序列，常用方法，效率探究

JAVA入门第二季结课大作业

答答租车系统

JAVA内部类，成员内部类，静态内部类，方法内部类

概念区分和用法简介

JAVA对象，类，方法，属性

Leetcode刷题

Problem 283

Problem 238

Problem 228

Problem 289

Problem 287

Problem 253

Problem 252

Problem 220

Problem 219

Problem 217

Problem 245

Problem 244

Problem 275

Problem 274

Problem 299

Problem 243

Problem 379

Problem 348

Problem 277

Problem 359

Problem 346

Problem 284

Problem 382

Problem 398

Problem 384

Problem 210

Problem 207

Problem 89

Problem 318

Problem 268

Problem 260

Problem 191

Problem 190

Problem 137

Problem 389

Problem 332

Problem 264

Problem 227

Problem 136

Problem 224

Problem 373

Problem 341

Problem 263

Problem 385

Problem 347

Problem 215

Problem 71

Problem 394

Problem 232

Problem 225

Problem 150

Problem 155

Problem 130

Problem 27

Remove Element

Problem 26

Remove Duplicates from Sorted Array

Problem 24

Swap Nodes In Pairs

Problem 22

Generate Parenteses

Problem 21

Merge Two Sorted Lists

Problem 20

Valid Parentheses

Problem 19

Remove Nth Node From End of List

Problem 18

4Sum

Problem 17

Letter Combination of a Phone Number

Problem 16

Problem 15

Problem 14

longest Common Prefix

Problem 13

Roman to Integer

Problem 12

Integer to Roman

Problem 106

Construct Binary Tree from Inorder and Postorder Traversal

Problem 105

Construct Binary Tree from Preorder and Inorder Traversal

Problem 177

Nth Highest Salary

Problem 109

Problem 103

Zigzag Level Order

Problem 110

Balanced Binary Tree

Problem 108

Convert Sorted Array to Binary Search Tree

Problem 107

Binary Tree Level Order Traversall II

Problem 104

Maximum Depth of Binary Tree

Problem 111

Minimum Depth of Binary Tree

Problem 96

Unique Binary Search Trees

Problem 100

Same Tree

Problem 94

Binary Tree Inorder Traversal

Problem 91

Decode Ways

Problem 92

Reverse Linked List II

Problem 90

Subsets II

Problem 206

Reverse Linked List

Problem 89

Gray Code

Problem 86

Partition List

Problem 83

Remove Duplicates from Sorted List

Problem 82

Rmove Duplicate from Sorted Array II

Problem 61

Rotate List

Problem 60

Permutation Sequence

Problem 56

Merge Intervals

Problem 55

Jump Game

Problem 59

Spiral Matrix II

Problem 58

Length of Last Word

Problem 54

Spiral Matrix

Problem 53

Maximum Subarray

Problem 50

Pow(x, n)

Problem 49

Group Anagrams

Problem 48

Rotate Image

Problem 47

Permutation II

Problem 46

Permutations

Problem 43

Multiply Strings

Problem 40

Combination Sum II

Problem 39

Combination Sum

Problem 38

Count and Say

Problem 36

Valid Sudoku

Problem 35

Search Insert Position

Problem 34

Find First and Last Position of Element in Sorted Array

Problem 33

Search in Rotated Sorted Array

Problem 31

Next Permutation

Problem 196

Delete Duplicate Emails

Problem 182

Duplicate Email

Problem 29

Divide Two Integers

Problem 9

Palindrome Number

Problem 8

Problem 11

Container With Most Water

Problem 7

Reverse Integer

Problem 6

ZigZag Coversion

Problem 5

Longest Palindromic Substring

Problem 3

Longest SubString Without Repeating Characters

Problem 2

Add Two Numbers

Problem 1

Two Sum

Problem 198

House Robber

Problem 157

Read N Characters Given Read4

Problem 191

Number of 1 Bits

Problem 190

Reverse Bits

Problem 170

Two Sum III Data Structure Design

Problem 172

Factorial Trailing Zeros

Problem 195

Tenth Line

Problem 183

Customers Who Never Order

Problem 176

Second Highest Salary

Problem 168

Excel Sheet Column Title

Problem 197

Rising Temperature

Problem 155

Min Stack

Problem 181

Employee earning more than their manager

Problem 175

Combine two tables

Problem 160

Intersection of Two Linked Lists

Problem 69

Sqrt(x)

Problem 141

Linked List Cycle

Problem 112

Sum Path

Problem 102

Binary Tree Level Order Traversal

Problem 171

Excel Sheet Column Number

Problem 169

Majority Element

Problem 136

Single Number

Problem 119

Pascal's Triangle II

Problem 118

Pascal's Triangle

Problem 67

Add Binary

Problem 70

Climbing Stairs

Problem 101

Symmetric Tree

Problem 66

Plus One

Problem 258

Add Digits

Problem 167

Two Sum II - Input array is sorted

Problem 125

Valid Palindrome

Problem 387

First Unique Character in a String

Problem 28

Implement strStr()

Problem 88

Merge Sorted Array

Problem 283

Move Zores

Problem 134

Gas Station

Problem 122

Best Time to Buy and Sell StockII

Problem 121

Best Time to Sell Stock

Problem 243

Shortest Word Distance

Problem 217

Contains Duplicate

Problem 299

Bulls and Cows

Problem 189

Rotate Array

Problem 277

Find the Celebrity

Problem 80

Remove Duplicates from Sorted ArrayII

Array

Problem 27

Remove Element

Problem 26

Remove Duplicates from Sorted Array

Problem 18

4Sum

Problem 16

Problem 15

Problem 60

Permutation Sequence

Problem 56

Merge Intervals

Problem 55

Jump Game

Problem 48

Rotate Image

Problem 11

Container With Most Water

Problem 169

Majority Element

Problem 136

Single Number

Problem 119

Pascal's Triangle II

Problem 118

Pascal's Triangle

Problem 134

Gas Station

Problem 122

Best Time to Buy and Sell StockII

Problem 121

Best Time to Sell Stock

Problem 243

Shortest Word Distance

Problem 217

Contains Duplicate

Problem 299

Bulls and Cows

Problem 189

Rotate Array

Problem 277

Find the Celebrity

Problem 80

Remove Duplicates from Sorted ArrayII

难度：中

Problem 24

Swap Nodes In Pairs

Problem 22

Generate Parenteses

Problem 19

Remove Nth Node From End of List

Problem 18

4Sum

Problem 17

Letter Combination of a Phone Number

Problem 16

Problem 15

Problem 12

Integer to Roman

Problem 106

Construct Binary Tree from Inorder and Postorder Traversal

Problem 105

Construct Binary Tree from Preorder and Inorder Traversal

Problem 177

Nth Highest Salary

Problem 109

Problem 103

Zigzag Level Order

Problem 96

Unique Binary Search Trees

Problem 94

Binary Tree Inorder Traversal

Problem 91

Decode Ways

Problem 92

Reverse Linked List II

Problem 90

Subsets II

Problem 89

Gray Code

Problem 86

Partition List

Problem 83

Remove Duplicates from Sorted List

Problem 82

Rmove Duplicate from Sorted Array II

Problem 61

Rotate List

Problem 60

Permutation Sequence

Problem 56

Merge Intervals

Problem 55

Jump Game

Problem 50

Pow(x, n)

Problem 49

Group Anagrams

Problem 48

Rotate Image

Problem 47

Permutation II

Problem 46

Permutations

Problem 43

Multiply Strings

Problem 40

Combination Sum II

Problem 39

Combination Sum

Problem 36

Valid Sudoku

Problem 34

Find First and Last Position of Element in Sorted Array

Problem 33

Search in Rotated Sorted Array

Problem 31

Next Permutation

Problem 29

Divide Two Integers

Problem 8

Problem 11

Container With Most Water

Problem 6

ZigZag Coversion

Problem 5

Longest Palindromic Substring

Problem 3

Longest SubString Without Repeating Characters

Problem 102

Binary Tree Level Order Traversal

Problem 134

Gas Station

Problem 299

Bulls and Cows

Problem 277

Find the Celebrity

Problem 80

Remove Duplicates from Sorted ArrayII

数据结构与算法

递归

汉诺塔问题

递归

斐波那契数列问题

循环链表的实现

单链表

增加新功能（显示所有节点，删除一个节点，插入一个节点）

单链表

单链表的实现（创建节点，追加节点，获取下一个节点）

队列的实现

入队，出队，判空

栈的实现

压入，弹出，查看栈的元素，以及栈是否为空

查找数组元素

线性查找和二分查找

对数组元素进行操作

增加，删除，取出，插入和替换

难度：易

Problem 27

Remove Element

Problem 26

Remove Duplicates from Sorted Array

Problem 21

Merge Two Sorted Lists

Problem 20

Valid Parentheses

Problem 14

longest Common Prefix

Problem 13

Roman to Integer

Problem 110

Balanced Binary Tree

Problem 108

Convert Sorted Array to Binary Search Tree

Problem 107

Binary Tree Level Order Traversall II

Problem 104

Maximum Depth of Binary Tree

Problem 111

Minimum Depth of Binary Tree

Problem 100

Same Tree

Problem 206

Reverse Linked List

Problem 58

Length of Last Word

Problem 53

Maximum Subarray

Problem 38

Count and Say

Problem 196

Delete Duplicate Emails

Problem 182

Duplicate Email

Problem 9

Palindrome Number

Problem 7

Reverse Integer

Problem 2

Add Two Numbers

Problem 1

Two Sum

Problem 198

House Robber

Problem 157

Read N Characters Given Read4

Problem 191

Number of 1 Bits

Problem 190

Reverse Bits

Problem 170

Two Sum III Data Structure Design

Problem 172

Factorial Trailing Zeros

Problem 195

Tenth Line

Problem 183

Customers Who Never Order

Problem 176

Second Highest Salary

Problem 168

Excel Sheet Column Title

Problem 197

Rising Temperature

Problem 155

Min Stack

Problem 181

Employee earning more than their manager

Problem 175

Combine two tables

Problem 160

Intersection of Two Linked Lists

Problem 69

Sqrt(x)

Problem 141

Linked List Cycle

Problem 112

Sum Path

Problem 171

Excel Sheet Column Number

Problem 169

Majority Element

Problem 136

Single Number

Problem 119

Pascal's Triangle II

Problem 118

Pascal's Triangle

Problem 67

Add Binary

Problem 70

Climbing Stairs

Problem 101

Symmetric Tree

Problem 66

Plus One

Problem 258

Add Digits

Problem 167

Two Sum II - Input array is sorted

Problem 125

Valid Palindrome

Problem 387

First Unique Character in a String

Problem 28

Implement strStr()

Problem 88

Merge Sorted Array

Problem 283

Move Zores

Problem 122

Best Time to Buy and Sell StockII

Problem 121

Best Time to Sell Stock

Problem 243

Shortest Word Distance

Problem 217

Contains Duplicate

Problem 189

Rotate Array

Sort

Problem 88

Merge Sorted Array

Problem 283

Move Zores

String

Problem 22

Generate Parenteses

Problem 20

Valid Parentheses

Problem 14

longest Common Prefix

Problem 13

Roman to Integer

Problem 12

Integer to Roman

Problem 58

Length of Last Word

Problem 49

Group Anagrams

Problem 43

Multiply Strings

Problem 38

Count and Say

Problem 9

Palindrome Number

Problem 8

Problem 6

ZigZag Coversion

Problem 5

Longest Palindromic Substring

Problem 3

Longest SubString Without Repeating Characters

Problem 157

Read N Characters Given Read4

Problem 168

Excel Sheet Column Title

Problem 171

Excel Sheet Column Number

Problem 125

Valid Palindrome

Problem 387

First Unique Character in a String

Problem 28

Implement strStr()

Math

Problem 50

Pow(x, n)

Problem 29

Divide Two Integers

Problem 7

Reverse Integer

Problem 1

Two Sum

Problem 172

Factorial Trailing Zeros

Problem 69

Sqrt(x)

Problem 67

Add Binary

Problem 66

Plus One

Problem 258

Add Digits

Problem 167

Two Sum II - Input array is sorted

Tree

Problem 106

Construct Binary Tree from Inorder and Postorder Traversal

Problem 105

Construct Binary Tree from Preorder and Inorder Traversal

Problem 110

Balanced Binary Tree

Problem 108

Convert Sorted Array to Binary Search Tree

Problem 107

Binary Tree Level Order Traversall II

Problem 104

Maximum Depth of Binary Tree

Problem 111

Minimum Depth of Binary Tree

Problem 96

Unique Binary Search Trees

Problem 100

Same Tree

Problem 94

Binary Tree Inorder Traversal

Problem 112

Sum Path

Problem 102

Binary Tree Level Order Traversal

Problem 101

Symmetric Tree

Dynamic Programming

Problem 96

Unique Binary Search Trees

Problem 91

Decode Ways

Problem 89

Gray Code

Problem 53

Maximum Subarray

Problem 198

House Robber

Problem 70

Climbing Stairs

LinkedList

Problem 24

Swap Nodes In Pairs

Problem 21

Merge Two Sorted Lists

Problem 19

Remove Nth Node From End of List

Problem 109

Problem 103

Zigzag Level Order

Problem 92

Reverse Linked List II

Problem 206

Reverse Linked List

Problem 86

Partition List

Problem 83

Remove Duplicates from Sorted List

Problem 82

Rmove Duplicate from Sorted Array II

Problem 61

Rotate List

Problem 2

Add Two Numbers

Problem 160

Intersection of Two Linked Lists

Problem 141

Linked List Cycle

SQL

Problem 177

Nth Highest Salary

Problem 196

Delete Duplicate Emails

Problem 182

Duplicate Email

Problem 183

Customers Who Never Order

Problem 176

Second Highest Salary

Problem 197

Rising Temperature

Problem 181

Employee earning more than their manager

Problem 175

Combine two tables

Stack

Problem 155

Min Stack

Shell

Problem 195

Tenth Line

Design

Problem 170

Two Sum III Data Structure Design

Bit Manipulation

Problem 191

Number of 1 Bits

Problem 190

Reverse Bits

BackTracking

Problem 90

Subsets II

Problem 60

Permutation Sequence

Problem 47

Permutation II

Problem 46

Permutations

Problem 40

Combination Sum II

Problem 39

Combination Sum

Problem 31

Next Permutation

Binary Search

Problem 35

Search Insert Position

Problem 34

Find First and Last Position of Element in Sorted Array

Problem 33

Search in Rotated Sorted Array

难度：

Problem 54

Spiral Matrix

Problem 35

Search Insert Position

Matrix

Problem 54

Spiral Matrix

Problem 36

Valid Sudoku

中

Problem 59

Spiral Matrix II

难度：Matrix

Problem 59

Spiral Matrix II

Backtracking

Problem 17

Letter Combination of a Phone Number

Data Structure

Implement of Stack

Implement of Queue

Implement of List

Implement of Array