chunweiliu / leetcode

LeetCode OJ Problems

Leetcode solutions

#	Problem	Solutions
303	range sum query 2d immutable	py
299	bulls and cows	py
295	find median from data stream	py
292	nim game	py
290	word pattern	py
289	game of life	py
287	find the duplicate number	py
284	peeking iterator	py
283	move zeroes	py
282	expression add operators	py
279	perfect squares	py
278	first bad version	py
275	h index ii	py
274	h index	py
273	integer to english words	py
268	missing number	py
264	ugly number ii	py
263	ugly number	py
260	single number	py
258	add digits	py
257	binary tree paths	py
242	valid anagram	py
241	different ways to add parentheses	py
240	search a 2d matrix	py
239	sliding window maximum	py
238	product of array except self	py
237	delete node in a linked list	py
236	lowest common ancestor of a binary tree	cc py
235	lowest common ancestor of a binary search tree	cc py
234	palindrome linked list	py
233	number of digit one	py
232	implement queue using stacks	py
231	power of two	py
230	kth smallest element in a bst	py
228	summary ranges	cc py
226	invert binary tree	cc py
225	implement stack using queues	py
224	basic calculator	py
223	rectangle area	cc py
222	count complete tree nodes	py
221	maximal square	py
220	contains duplicate iii	py
219	contains duplicate ii	cc py
217	contains duplicate	cc py
216	combination sum iii	py
215	kth largest element in an array	cc py
213	house robber ii	py
210	course schedule ii	cc py
209	minimum size subarray sum	py
208	implement trie prefix tree	py
207	course schedule	cc py
206	reverse linked list	py
203	remove linked list elements	py
202	happy number	py
200	number of islands	py
199	binary tree right side view	cc
198	house robber	py
188	best time to buy and sell stock	py
173	binary search tree iterator	py
172	factorial-trailing-zeroes
169	majority-element
168	excel-sheet-column-title
166	fraction to recurring decimal	py
165	compare version numbers	py
162	find peak element	py
160	intersection of two linked lists	py
157	read n characters given read4	py
155	min stack	py
154	find minimum in rotated sorted array ii	py
153	find minimum in rotated sorted array	py
151	reverse words in a string	py
146	lru cache	py
145	binary tree postorder traversal	cc
144	binary tree preorder traversal	cc
143	reorder list	py
139	word break	py
133	clone graph	cc
132	palindrome partitioning ii	py
131	palindrome partitioning	py
128	longest consecutive sequence	py
127	word ladder	py
125	valid palindrome	py
124	binary tree maximum path sum	py
123	best time to buy and sell stock iii	py
122	best time to buy and sell stock ii	py
119	pascals-triangle-ii
118	pascals-triangle
113	path sum ii	py
112	path sum	py
111	minimum depth of binary tree	py
110	balanced binary tree	cc py
109	convert sorted list to binary search tree	py
108	convert sorted array to binary search tree	py
107	binary tree level order traversal	cc py
107	binary tree level order traversal ii	py
104	maximum depth of binary tree	py
103	binary tree zigzag level order traversal	cc
101	symmetric tree	py
100	same tree	py
098	validate binary search tree	py
096	unique binary search trees	py
095	unique binary search trees ii	py
094	binary tree inorder traversal	cc
093	restore ip addresses	py
092	reverse linked list ii	py
091	decode ways	py
090	subsets ii	py
089	gray code	py
088	merge sorted array	py
086	partition list	py
085	maximal rectangle	py
084	largest rectangle in histogram	py
083	remove duplicates from sorted list	py
082	remove duplicates from sorted list ii	py
081	search in rotated sorted array ii	py
080	remove duplicates from sorted array ii	py
079	word search	py
078	subsets	py
077	combinations	py
076	minimum window substring	py
075	sort colors	py
073	set matrix zeroes	py
072	one edit distance	py
071	simplify path	py
070	climbing stairs	py
069	sqrtx	py
067	add binary	py
066	plus one	py
064	minimum path sum	py
063	unique paths ii	py
062	unique paths	py
061	rotate list	py
060	permutation sequence	py
059	spiral matrix ii	py
058	length of last word	py
057	insert interval	py
056	merge intervals	py
055	jump game	py
054	spiral matrix	py
053	maximum subarray	py
050	powx n	py
049	anagrams	py
048	rotate image	py
047	permutations ii	py
046	permutations	py
044	wildcard matching	py
043	multiply strings	py
042	trapping rain water	py
041	first missing positive	py
040	combination sum ii	py
039	combination sum	py
038	count and say	py
037	sudoku solver	py
036	valid sudoku	py
035	search insert position	py
034	search for a range	py
033	search in rotated sorted array	py
032	longest valid parentheses	py
031	next permutation	py
030	substring with concatenation of all words	py
029	divide two integers	py
028	implement strstr	py
027	remove element	py
026	remove duplicates from sorted array	py
025	reverse nodes in k group	py
024	swap nodes in pairs	py
023	merge k sorted lists	py
022	generate parentheses	py
021	merge two sorted lists	py
020	valid parentheses	py
019	remove nth node from end of list	py
018	4sum	py
017	letter combinations of a phone number	py
016	3sum closest	py
015	3sum	py
014	longest common prefix	py
013	roman to integer	py
012	integer to roman	py
011	container with most water	py
010	regular expression matching	py
009	palindrome number	py
008	string to integer atoi	cc py
007	reverse integer	py
006	zigzag conversion	cc py
005	longest palindromic substring	cc py
004	median of two sorted arrays	cc py
003	longest substring without repeating characters	cc py rb
002	add two numbers	cc py rb
001	two sum	cc py rb