awesome-java-leetcode
我如今是一名 Android Developer，大学的我曾是一名 ACMer，我一直认为数据结构和算法是作为一名程序员必须掌握和善于利用的，为了不让数据结构和算法淡出我的记忆，所以我打算重拾 LeetCode 之 Algorithm，语言选择的是 Java，题库会一点点完善起来，按简单，中等，困难分类，相应难度下按题号排序，源代码在 src 目录中，相关解题都在 note 目录中，想要学习数据结构和算法或打算刷 LeetCode 的小伙伴们欢迎 star 哦。
如今有机会面试 Facebook，附上 LeetCode 上 Facebook 的面试题目序号，希望可以帮助到以后想入 Facebook 的小伙伴:-)
1,10,13,15,17,20,23,25,26,28,33,38,43,44,49,50,56,57,67,68,69,71,75,76
78,79,80,85,88,90,91,98,102,117,121,125,127,128,133,139,146,157,158,161
168,173,200,206,208,209,210,211,215,218,221,234,235,236,238,252,253,257
261,265,269,273,274,275,277,278,282,283,285,286,297,301,311,314,325,334
341,377,380,398,404,410,461,477,494,523,525,534,535,543,554
如果想知道更多公司 LeetCode 面试题，可以参看 Companies.md。
附上镇楼诗：
明有科举八股，今有 LeetCode。
八股定格式而取文采心意，LeetCode 定题目且重答案背诵。
美其名曰："practice makes perfect."
为何今不如古？
非也非也，
科举为国取士，LeetCode 为 Google 筛码工，各取所需也。
Easy
#
Title
Tag
1
Two Sum
Array, Hash Table
7
Reverse Integer
Math
9
Palindrome Number
Math
13
Roman to Integer
Math, String
14
Longest Common Prefix
String
16.11
跳水板(Diving Board LCCI)
递归、记忆化
20
Valid Parentheses
Stack, String
21
Merge Two Sorted Lists
Linked List
26
Remove Duplicates from Sorted Array
Array, Two Pointers
27
Remove Element
Array, Two Pointers
28
Implement strStr()
Two Pointers, String
35
Search Insert Position
String
38
Count and Say
String
53
Maximum Subarray
Array, Divide and Conquer, Dynamic Programming
58
Length of Last Word
String
66
[Plus One][0066]
Array, Math
67
[Add Binary][0067]
Math, String
69
[Sqrt(x)][0069]
Binary Search, Math
70
[Climbing Stairs][0070]
Dynamic Programming
83
[Remove Duplicates from Sorted List][0083]
Linked List
88
[Merge Sorted Array][0088]
Array, Two Pointers
100
[Same Tree][0100]
Tree, Depth-first Search
101
[Symmetric Tree][0101]
Tree, Depth-first Search, Breadth-first Search
104
[Maximum Depth of Binary Tree][0104]
Tree, Depth-first Search
107
[Binary Tree Level Order Traversal II][107]
Tree, Breadth-first Search
108
[Convert Sorted Array to Binary Search Tree][0108]
Tree, Depth-first Search
110
[Balanced Binary Tree][0110]
Tree, Depth-first Search
111
[Minimum Depth of Binary Tree][0111]
Tree, Depth-first Search, Breadth-first Search
112
[Path Sum][0112]
Tree, Depth-first Search
118
[Pascal's Triangle][0118]
Array
119
[Pascal's Triangle II][0119]
Array
121
[Best Time to Buy and Sell Stock][0121]
Array, Dynamic Programmin
122
[Best Time to Buy and Sell Stock II][0122]
Array, Greedy
543
[Diameter of Binary Tree][0543]
Tree
Medium
#
Title
Tag
2
[Add Two Numbers][0002]
Linked List, Math
3
[Longest Substring Without Repeating Characters][0003]
Hash Table, Two Pointers, String
5
[Longest Palindromic Substring][0005]
String, Dynamic Programming
6
[ZigZag Conversion][0006]
String
8
[String to Integer (atoi)][0008]
Math, String
11
[Container With Most Water][0011]
Array, Two Pointers
12
[Integer to Roman][0012]
Math, String
15
[3Sum][0015]
Array, Two Pointers
15
[3Sum Closest][0016]
Array, Two Pointers
17
[Letter Combinations of a Phone Number][0017]
String, Backtracking
18
[4Sum][0018]
Array, Hash Table, Two Pointers
19
[Remove Nth Node From End of List][0019]
Linked List, Two Pointers
22
[Generate Parentheses][0022]
String, Backtracking
24
[Swap Nodes in Pairs][0024]
Linked List
29
[Divide Two Integers][0029]
Math, Binary Search
33
[Search in Rotated Sorted Array][0033]
Arrays, Binary Search
43
[Multiply Strings][0043]
Math, String
49
[Group Anagrams][0049]
Hash Table, String
50
[Pow(x, n)][0050]
Math, Binary Search
56
[Merge Intervals][0056]
Array, Sort
63
[不同路径 II(Unique Paths II)][0063]
数组、动态规划
209
[长度最小的子数组(Minimum Size Subarray Sum)][0209]
数组、双指针、二分查找
215
[数组中的第K个最大元素(Kth Largest Element in an Array)][0215]
堆、分治算法
554
[Brick Wall][0554]
Hash Table
1014
[最佳观光组合(Best Sightseeing Pair)][1014]
数组
Hard
#
Title
Tag
4
[Median of Two Sorted Arrays][0004]
Array, Binary Search, Divide and Conquer
10
[Regular Expression Matching][0010]
String, Dynamic Programming, Backtracking
23
[Merge k Sorted Lists][0023]
Linked List, Divide and Conquer, Heap
25
[Reverse Nodes in k-Group][0025]
Linked List
30
[Substring with Concatenation of All Words][0030]
Hash Table, Two Pointers, String
44
[Wildcard Matching][0044]
String, Dynamic Programming, Backtracking, Greedy
57
[Insert Interval][0057]
Array, Sort
68
[Text Justification][0068]
String
1028
[从先序遍历还原二叉树(Recover a Tree From Preorder Traversal)][1028]
树、深度优先搜索
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