534
Design TinyURL
99
0.0%
Medium
1
Two Sum
99
Link
36.4%
Easy
13
Roman to Integer
99
47.0%
Easy
461
Hamming Distance
98
69.7%
Easy
20
Valid Parentheses
95
33.7%
Easy
535
Encode and Decode TinyURL
94
Link
74.1%
Medium
206
Reverse Linked List
94
Link
46.3%
Easy
146
LRU Cache
94
18.9%
Hard
283
Move Zeroes
93
Link
50.9%
Easy
23
Merge k Sorted Lists
92
Link
27.8%
Hard
121
Best Time to Buy and Sell Stock
91
Link
42.2%
Easy
38
Count and Say
91
35.9%
Easy
15
3Sum
90
21.8%
Medium
10
Regular Expression Matching
89
Link
24.3%
Hard
238
Product of Array Except Self
89
49.9%
Medium
17
Letter Combinations of a Phone Number
88
35.6%
Medium
50
Pow(x, n)
88
26.0%
Medium
88
Merge Sorted Array
88
32.1%
Easy
67
Add Binary
87
33.4%
Easy
139
Word Break
86
Link
30.9%
Medium
26
Remove Duplicates from Sorted Array
86
Link
35.6%
Easy
200
Number of Islands
85
Link
35.8%
Medium
49
Group Anagrams
85
Link
36.8%
Medium
56
Merge Intervals
85
Link
31.2%
Medium
234
Palindrome Linked List
84
33.2%
Easy
33
Search in Rotated Sorted Array
82
32.1%
Medium
28
Implement strStr()
82
28.7%
Easy
85
Maximal Rectangle
81
29.0%
Hard
173
Binary Search Tree Iterator
81
42.7%
Medium
128
Longest Consecutive Sequence
79
Link
37.7%
Hard
235
Lowest Common Ancestor of a Binary Search Tree
79
39.5%
Easy
273
Integer to English Words
78
22.5%
Hard
69
Sqrt(x)
75
28.4%
Easy
43
Multiply Strings
74
27.7%
Medium
79
Word Search
73
27.6%
Medium
218
The Skyline Problem
73
28.4%
Hard
236
Lowest Common Ancestor of a Binary Tree
70
30.0%
Medium
127
Word Ladder
69
19.7%
Medium
125
Valid Palindrome
68
26.7%
Easy
168
Excel Sheet Column Title
67
26.8%
Easy
76
Minimum Window Substring
67
26.3%
Hard
297
Serialize and Deserialize Binary Tree
66
34.1%
Hard
215
Kth Largest Element in an Array
65
40.0%
Medium
78
Subsets
65
42.9%
Medium
278
First Bad Version
65
Link
25.9%
Easy
301
Remove Invalid Parentheses
64
35.6%
Hard
102
Binary Tree Level Order Traversal
64
41.3%
Medium
341
Flatten Nested List Iterator
62
42.4%
Medium
75
Sort Colors
62
38.5%
Medium
91
Decode Ways
61
20.1%
Medium
208
Implement Trie (Prefix Tree)
61
Link
29.8%
Medium
647
Palindromic Substrings
60
Link
55.7%
Medium
282
Expression Add Operators
60
30.4%
Hard
257
Binary Tree Paths
59
40.0%
Easy
133
Clone Graph
59
25.2%
Medium
253
Meeting Rooms II
58
39.4%
Medium
334
Increasing Triplet Subsequence
58
39.9%
Medium
621
Task Scheduler
58
Link
42.5%
Medium
25
Reverse Nodes in k-Group
58
31.1%
Hard
44
Wildcard Matching
56
20.7%
Hard
71
Simplify Path
55
25.9%
Medium
80
Remove Duplicates from Sorted Array II
54
36.5%
Medium
68
Text Justification
53
19.7%
Hard
311
Sparse Matrix Multiplication
52
52.0%
Medium
269
Alien Dictionary
51
25.5%
Hard
221
Maximal Square
51
Link
29.8%
Medium
277
Find the Celebrity
51
35.8%
Medium
161
One Edit Distance
50
31.6%
Medium
380
Insert Delete GetRandom O(1)
50
39.5%
Medium
98
Validate Binary Search Tree
49
23.8%
Medium
57
Insert Interval
49
28.5%
Hard
543
Diameter of Binary Tree
48
Link
44.8%
Easy
209
Minimum Size Subarray Sum
46
Link
31.5%
Medium
252
Meeting Rooms
46
Link
48.5%
Easy
117
Populating Next Right Pointers in Each Node II
46
33.9%
Medium
274
H-Index
45
Link
33.6%
Medium
325
Maximum Size Subarray Sum Equals k
44
43.1%
Medium
285
Inorder Successor in BST
43
36.3%
Medium
377
Combination Sum IV
42
42.5%
Medium
653
Two Sum IV - Input is a BST
42
Link
50.2%
Easy
90
Subsets II
41
37.4%
Medium
157
Read N Characters Given Read4
40
29.2%
Easy
674
Longest Continuous Increasing Subsequence
39
Link
42.7%
Easy
404
Sum of Left Leaves
38
47.3%
Easy
410
Split Array Largest Sum
38
Link
38.8%
Hard
637
Average of Levels in Binary Tree
38
Link
55.7%
Easy
158
Read N Characters Given Read4 II - Call multiple times
37
24.6%
Hard
286
Walls and Gates
34
Link
45.0%
Medium
275
H-Index II
33
34.7%
Medium
210
Course Schedule II
31
29.4%
Medium
314
Binary Tree Vertical Order Traversal
31
37.5%
Medium
670
Maximum Swap
31
Link
38.3%
Medium
211
Add and Search Word - Data structure design
30
24.3%
Medium
680
Valid Palindrome II
29
Link
32.6%
Easy
689
Maximum Sum of 3 Non-Overlapping Subarrays
29
Link
41.3%
Hard
572
Subtree of Another Tree
28
Link
40.7%
Easy
494
Target Sum
28
Link
43.7%
Medium
673
Number of Longest Increasing Subsequence
28
Link
31.2%
Medium
477
Total Hamming Distance
27
Link
47.7%
Medium
636
Exclusive Time of Functions
25
Link
44.0%
Medium
714
Best Time to Buy and Sell Stock with Transaction Fee
24
Link
42.2%
Medium
525
Contiguous Array
23
Link
41.1%
Medium
642
Design Search Autocomplete System
22
Link
31.0%
Hard
398
Random Pick Index
22
44.1%
Medium
554
Brick Wall
18
Link
46.1%
Medium
261
Graph Valid Tree
18
38.2%
Medium
265
Paint House II
17
38.2%
Hard
523
Continuous Subarray Sum
17
Link
23.3%
Medium
597
Friend Requests I: Overall Acceptance Rate
13
Link
37.9%
Easy
639
Decode Ways II
9
Link
24.4%
Hard
745
Prefix and Suffix Search
6
Link
21.5%
Hard
721
Accounts Merge
2
Link
30.1%
Medium
578
Get Highest Answer Rate Question
2
Link
28.1%
Medium
602
Friend Requests II: Who Has the Most Friends
0
Link
42.1%
Medium
750
Number Of Corner Rectangles
0
Link
46.5%
Medium
764
Largest Plus Sign
0
Link
32.0%
Medium