README.md

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	Array, Math
67	Add Binary	Math, String
69	Sqrt(x)	Binary Search, Math
70	Climbing Stairs	Dynamic Programming
83	Remove Duplicates from Sorted List	Linked List
88	Merge Sorted Array	Array, Two Pointers
100	Same Tree	Tree, Depth-first Search
101	Symmetric Tree	Tree, Depth-first Search, Breadth-first Search
104	Maximum Depth of Binary Tree	Tree, Depth-first Search
107	[Binary Tree Level Order Traversal II][107]	Tree, Breadth-first Search
108	Convert Sorted Array to Binary Search Tree	Tree, Depth-first Search
110	Balanced Binary Tree	Tree, Depth-first Search
111	Minimum Depth of Binary Tree	Tree, Depth-first Search, Breadth-first Search
112	Path Sum	Tree, Depth-first Search
118	Pascal's Triangle	Array
119	Pascal's Triangle II	Array
121	Best Time to Buy and Sell Stock	Array, Dynamic Programmin
122	Best Time to Buy and Sell Stock II	Array, Greedy
543	Diameter of Binary Tree	Tree

Medium

#	Title	Tag
2	Add Two Numbers	Linked List, Math
3	Longest Substring Without Repeating Characters	Hash Table, Two Pointers, String
5	Longest Palindromic Substring	String, Dynamic Programming
6	ZigZag Conversion	String
8	String to Integer (atoi)	Math, String
11	Container With Most Water	Array, Two Pointers
12	Integer to Roman	Math, String
15	3Sum	Array, Two Pointers
15	3Sum Closest	Array, Two Pointers
17	Letter Combinations of a Phone Number	String, Backtracking
18	4Sum	Array, Hash Table, Two Pointers
19	Remove Nth Node From End of List	Linked List, Two Pointers
22	Generate Parentheses	String, Backtracking
24	Swap Nodes in Pairs	Linked List
29	Divide Two Integers	Math, Binary Search
33	Search in Rotated Sorted Array	Arrays, Binary Search
43	Multiply Strings	Math, String
49	Group Anagrams	Hash Table, String
50	Pow(x, n)	Math, Binary Search
56	Merge Intervals	Array, Sort
63	不同路径 II(Unique Paths II)	数组、动态规划
209	长度最小的子数组(Minimum Size Subarray Sum)	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)	堆、分治算法
554	Brick Wall	Hash Table
1014	最佳观光组合(Best Sightseeing Pair)	数组

Hard

#	Title	Tag
4	Median of Two Sorted Arrays	Array, Binary Search, Divide and Conquer
10	Regular Expression Matching	String, Dynamic Programming, Backtracking
23	Merge k Sorted Lists	Linked List, Divide and Conquer, Heap
25	Reverse Nodes in k-Group	Linked List
30	Substring with Concatenation of All Words	Hash Table, Two Pointers, String
44	Wildcard Matching	String, Dynamic Programming, Backtracking, Greedy
57	Insert Interval	Array, Sort
68	Text Justification	String
1028	从先序遍历还原二叉树(Recover a Tree From Preorder Traversal)	树、深度优先搜索

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