LeetCode Online Judge Questions Table

Leetcode (Finished)

#	Title	Difficulty	Keyword
307	Range Sum Query - Mmutable	Medium	Segment Tree
304	Range Sum Query 2D - Immutable	Medium	DP
303	Range Sum Query - Immutable	Easy	DP
301	Remove Invalid Parentheses	Hard
300	Longest Increasing Subsequence	Medium	DP
299	Bulls and Cows	Easy	Hash Map
297	Serialize and Deserialize Binary Tree	Hard	Tree Travsersal
295	Find Median from Data Stream	Hard	Heap
292	Nim Game	Easy
290	Word Pattern	Easy	Hash
289	Game of Life	Meduim	Array
287	Find the Duplicate Number	Hard	Two Pointers, Linked list
284	Peeking Iterator	Medium	Design
283	Moving Zeros	Easy	two pointers
282	Expression Add Operators	Hard	DFS, String
279	Perfect Squares	Medium	BFS, DP
278	First Bad Version	Easy	binary search
275	H-Index II	Medium	binary search
274	H-Index	Medium
273	Integer to English Words	Hard	String
268	Missing Number	Medium
264	Ugly Number II	Medium
263	Ugly Number	Easy
260	Single Number III	Medium
258	Add Digits	Easy
257	Binary Tree Paths	Easy
242	Valid Anagram	Easy
241	Different Ways to Add Parentheses	Medium
240	Search a 2D Matrix II	Medium
239	Sliding Window Maximum	Hard
238	Product of Array Except Self	Medium
237	Delete Node in a Linked List	Easy
236	Lowest Common Ancestor of a Binary Tree	Medium
235	Lowest Common Ancestor of a Binary Search Tree	Easy
234	Palindrome Linked List	Easy
233	Number of Digit One	Hard
232	Implement Queue using Stacks	Easy
231	Power of Two	Easy
230	Kth Smallest Element in a BST	Medium
229	Majority Element II	Medium
228	Summary Ranges	Medium
227	Basic Calculator II	Medium
226	Invert Binary Tree	Easy
225	Implement Stack using Queues	Easy
224	Basic Calculator	Hard
223	Rectangle Area	Easy
222	Count Complete Tree Nodes	Medium
221	Maximal Square	Medium
220	Contains Duplicate III	Medium
219	Contains Duplicate II	Easy
218	The Skyline Problem	Hard
217	Contains Duplicate	Easy
216	Combination Sum III	Medium
215	Kth Largest Element in an Array	Medium
214	Shortest Palindrome	Hard
213	House Robber II	Medium	DP
212	Word Search II	Hard
211	Add and Search Word - Data structure design	Medium
210	Course Schedule II	Medium
209	Minimum Size Subarray Sum	Medium
208	Implement Trie (Prefix Tree)	Medium
207	Course Schedule	Medium
206	Reverse Linked List	Easy
205	Isomorphic Strings	Easy
204	Count Primes	Easy
203	Remove Linked List Elements	Easy
202	Happy Number	Easy
201	Bitwise AND of Numbers Range	Medium
200	Number of Islands	Medium
199	Binary Tree Right Side View	Medium
198	House Robber	Easy
191	Number of 1 Bits	Easy
190	Reverse Bits	Easy
189	Rotate Array	Easy
188	Best Time to Buy and Sell Stock IV	Hard
187	Repeated DNA Sequences	Medium
179	Largest Number	Medium
174	Dungeon Game	Hard
173	Binary Search Tree Iterator	Medium
172	Factorial Trailing Zeroes	Easy
171	Excel Sheet Column Number	Easy
169	Majority Element	Easy
168	Excel Sheet Column Title	Easy
167	Two Sum II - Input array is sorted	Medium
166	Fraction to Recurring Decimal	Medium
165	Compare Version Numbers	Easy
164	Maximum Gap	Hard
162	Find Peak Element	Medium
160	Intersection of Two Linked Lists	Easy
155	Min Stack	Easy
154	Find Minimum in Rotated Sorted Array II	Hard
153	Find Minimum in Rotated Sorted Array	Medium
152	Maximum Product Subarray	Medium
151	Reverse Words in a String	Medium
150	Evaluate Reverse Polish Notation	Medium
149	Max Points on a Line	Hard
148	Sort List	Medium
147	Insertion Sort List	Medium
146	LRU Cache	Hard
145	Binary Tree Postorder Traversal	Hard
144	Binary Tree Preorder Traversal	Medium
143	Reorder List	Medium
142	Linked List Cycle II	Medium
141	Linked List Cycle	Easy
140	Word Break II	Hard
139	Word Break	Medium
138	Copy List with Random Pointer	Hard
137	Single Number II	Medium
136	Single Number	Easy
135	Candy	Hard
134	Gas Station	Medium
133	Clone Graph	Medium
132	Palindrome Partitioning II	Hard
131	Palindrome Partitioning	Medium
130	Surrounded Regions	Medium
129	Sum Root to Leaf Numbers	Medium
128	Longest Consecutive Sequence	Hard
127	Word Ladder	Medium
126	Word Ladder II	Hard
125	Valid Palindrome	Easy
124	Binary Tree Maximum Path Sum	Hard
123	Best Time to Buy and Sell Stock III	Hard
122	Best Time to Buy and Sell Stock II	Medium
121	Best Time to Buy and Sell Stock	Easy
120	Triangle	Medium
119	Pascal's Triangle II	Easy
118	Pascal's Triangle	Easy
117	Populating Next Right Pointers in Each Node II	Hard
116	Populating Next Right Pointers in Each Node	Medium
115	Distinct Subsequences	Hard
114	Flatten Binary Tree to Linked List	Medium
113	Path Sum II	Medium
112	Path Sum	Easy
111	Minimum Depth of Binary Tree	Easy
110	Balanced Binary Tree	Easy
109	Convert Sorted List to Binary Search Tree	Medium
108	Convert Sorted Array to Binary Search Tree	Medium
107	Binary Tree Level Order Traversal II	Easy
106	Construct Binary Tree from Inorder and Postorder Traversal	Medium
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium
104	Maximum Depth of Binary Tree	Easy
103	Binary Tree Zigzag Level Order Traversal	Medium
102	Binary Tree Level Order Traversal	Easy
101	Symmetric Tree	Easy
100	Same Tree	Easy
99	Recover Binary Search Tree	Hard
98	Validate Binary Search Tree	Medium
97	Interleaving String	Hard
96	Unique Binary Search Trees	Medium
95	Unique Binary Search Trees II	Medium
94	Binary Tree Inorder Traversal	Medium
93	Restore IP Addresses	Medium
92	Reverse Linked List II	Medium
91	Decode Ways	Medium
90	Subsets II	Medium
89	Gray Code	Medium
88	Merge Sorted Array	Easy
87	Scramble String	Hard
86	Partition List	Medium
85	Maximal Rectangle	Hard
84	Largest Rectangle in Histogram	Hard
83	Remove Duplicates from Sorted List	Easy
82	Remove Duplicates from Sorted List II	Medium
81	Search in Rotated Sorted Array II	Medium
80	Remove Duplicates from Sorted Array II	Medium
79	Word Search	Medium
78	Subsets	Medium
77	Combinations	Medium
76	Minimum Window Substring	Hard
75	Sort Colors	Medium
74	Search a 2D Matrix	Medium
73	Set Matrix Zeroes	Medium
72	Edit Distance	Hard
71	Simplify Path	Medium
70	Climbing Stairs	Easy
69	Sqrt(x)	Medium
68	Text Justification	Hard
67	Add Binary	Easy
66	Plus One	Easy
65	Valid Number	Hard
64	Minimum Path Sum	Medium
63	Unique Paths II	Medium
62	Unique Paths	Medium
61	Rotate List	Medium
60	Permutation Sequence	Medium
59	Spiral Matrix II	Medium
58	Length of Last Word	Easy
57	Insert Interval	Hard
56	Merge Intervals	Hard
55	Jump Game	Medium
54	Spiral Matrix	Medium
53	Maximum Subarray	Medium
52	N-Queens II	Hard
51	N-Queens	Hard
50	Pow(x, n)	Medium
49	Group Anagrams	Medium
48	Rotate Image	Medium
47	Permutations II	Medium
46	Permutations	Medium
45	Jump Game II	Hard
44	Wildcard Matching	Hard
43	Multiply Strings	Medium
42	Trapping Rain Water	Hard
41	First Missing Positive	Hard
40	Combination Sum II	Medium
39	Combination Sum	Medium
38	Count and Say	Easy
37	Sudoku Solver	Hard
36	Valid Sudoku	Easy
35	Search Insert Position	Medium
34	Search for a Range	Medium
33	Search in Rotated Sorted Array	Hard
32	Longest Valid Parentheses	Hard
31	Next Permutation	Medium
30	Substring with Concatenation of All Words	Hard
29	Divide Two Integers	Medium
28	Implement strStr()	Easy
27	Remove Element	Easy
26	Remove Duplicates from Sorted Array	Easy
25	Reverse Nodes in k-Group	Hard
24	Swap Nodes in Pairs	Easy
23	Merge k Sorted Lists	Hard
22	Generate Parentheses	Medium
21	Merge Two Sorted Lists	Easy
20	Valid Parentheses	Easy
19	Remove Nth Node From End of List	Easy
18	4Sum	Medium
17	Letter Combinations of a Phone Number	Medium
16	3Sum Closest	Medium
15	3Sum	Medium
14	Longest Common Prefix	Easy
13	Roman to Integer	Easy
12	Integer to Roman	Medium
11	Container With Most Water	Medium
10	Regular Expression Matching	Hard
9	Palindrome Number	Easy
8	String to Integer (atoi)	Easy
7	Reverse Integer	Easy
6	ZigZag Conversion	Easy
5	Longest Palindromic Substring	Medium
4	Median of Two Sorted Arrays	Hard
3	Longest Substring Without Repeating Characters	Medium
2	Add Two Numbers	Medium
1	Two Sum	Easy	Hash Map