andrewcyhuang/LeetCodeByCompany

Collection of LeetCode questions asked in Computer Science interviews (Categorized by Company Name)

Company Interview Questions

Collection of LeetCode questions asked in Computer Science interviews (Categorized by Company Name)

Adobe

#	Title	Difficulty	Acceptance	Frequency
4	Median of Two Sorted Arrays	Hard	23.9%	0.121
1	Two Sum	Easy	38.9%	1.508
21	Merge Two Sorted Lists	Easy	43.2%	0.011
7	Reverse Integer	Easy	24.4%	0.031
2	Add Two Numbers	Medium	29.2%	0.256
12	Integer to Roman	Medium	47.7%	0.013
8	String to Integer (atoi)	Medium	14.1%	0.007
121	Best Time to Buy and Sell Stock	Easy	44.4%	0.005
175	Combine Two Tables	Easy	45.2%	0.013
13	Roman to Integer	Easy	49.5%	0.054
85	Maximal Rectangle	Hard	30.8%	0.029
20	Valid Parentheses	Easy	34.6%	0.009
44	Wildcard Matching	Hard	21.6%	0.019
78	Subsets	Medium	47.8%	0.019
200	Number of Islands	Medium	38.0%	0.006
11	Container With Most Water	Medium	38.9%	0.051
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.09
15	3Sum	Medium	22.1%	0.018
14	Longest Common Prefix	Easy	32.0%	0.013
16	3Sum Closest	Medium	32.6%	0.011
53	Maximum Subarray	Easy	41.3%	0.011
94	Binary Tree Inorder Traversal	Medium	52.3%	0.006
9	Palindrome Number	Easy	38.5%	0.005
771	Jewels and Stones	Easy	81.7%	0.071
5	Longest Palindromic Substring	Medium	25.6%	0.029
22	Generate Parentheses	Medium	50.2%	0.008
41	First Missing Positive	Hard	26.8%	0.03
262	Trips and Users	Hard	21.1%	0.141
67	Add Binary	Easy	35.8%	0.01
657	Robot Return to Origin	Easy	69.1%	0.011
138	Copy List with Random Pointer	Medium	25.6%	0.024
122	Best Time to Buy and Sell Stock II	Easy	49.2%	0.018
114	Flatten Binary Tree to Linked List	Medium	38.6%	0.014
695	Max Area of Island	Easy	53.1%	0.015

Aetion

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.006
15	3Sum	Medium	22.1%	0.004
19	Remove Nth Node From End of List	Medium	33.6%	0.006

Affirm

#	Title	Difficulty	Acceptance	Frequency
736	Parse Lisp Expression	Hard	41.6%	0.205
695	Max Area of Island	Easy	53.1%	0.059
146	LRU Cache	Hard	21.4%	0.009
713	Subarray Product Less Than K	Medium	33.5%	0.043

Airbnb

#	Title	Difficulty	Acceptance	Frequency
751	IP to CIDR	Easy	52.3%	0.209
42	Trapping Rain Water	Hard	39.2%	0.02
11	Container With Most Water	Medium	38.9%	0.013
39	Combination Sum	Medium	43.7%	0.064
1	Two Sum	Easy	38.9%	0.032
336	Palindrome Pairs	Hard	28.1%	1.376
787	Cheapest Flights Within K Stops	Medium	30.5%	0.328
2	Add Two Numbers	Medium	29.2%	0.007
269	Alien Dictionary	Hard	27.6%	0.186
773	Sliding Puzzle	Hard	46.9%	0.188
829	Consecutive Numbers Sum	Medium	28.1%	0.089
7	Reverse Integer	Easy	24.4%	0.003
251	Flatten 2D Vector	Medium	42.1%	0.295
755	Pour Water	Medium	35.7%	0.467
341	Flatten Nested List Iterator	Medium	44.4%	0.076
16	3Sum Closest	Medium	32.6%	0.011
76	Minimum Window Substring	Hard	28.2%	0.075
68	Text Justification	Hard	21.0%	0.041
843	Guess the Word	Hard	36.3%	0.06

Akuna Capital

#	Title	Difficulty	Acceptance	Frequency
20	Valid Parentheses	Easy	34.6%	0.004

Alation

#	Title	Difficulty	Acceptance	Frequency
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.006
274	H-Index	Medium	34.1%	0
168	Excel Sheet Column Title	Easy	27.9%	0.02
171	Excel Sheet Column Number	Easy	49.7%	0.015

Alibaba

#	Title	Difficulty	Acceptance	Frequency
9	Palindrome Number	Easy	38.5%	0.011
1	Two Sum	Easy	38.9%	0.243
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.012
53	Maximum Subarray	Easy	41.3%	0.031
15	3Sum	Medium	22.1%	0.005
21	Merge Two Sorted Lists	Easy	43.2%	0.011
23	Merge k Sorted Lists	Hard	30.3%	0.029
138	Copy List with Random Pointer	Medium	25.6%	0.024
45	Jump Game II	Hard	26.4%	0.019
49	Group Anagrams	Medium	41.3%	0.008
20	Valid Parentheses	Easy	34.6%	0.016
344	Reverse String	Easy	61.5%	0.006
5	Longest Palindromic Substring	Medium	25.6%	0.011
695	Max Area of Island	Easy	53.1%	0.015
179	Largest Number	Medium	24.3%	0.023
7	Reverse Integer	Easy	24.4%	0.014
2	Add Two Numbers	Medium	29.2%	0.071
122	Best Time to Buy and Sell Stock II	Easy	49.2%	0.008
50	Pow(x, n)	Medium	26.6%	0.009
141	Linked List Cycle	Easy	34.6%	0.007
200	Number of Islands	Medium	38.0%	0.024
70	Climbing Stairs	Easy	42.1%	0.007
33	Search in Rotated Sorted Array	Medium	32.1%	0.015
4	Median of Two Sorted Arrays	Hard	23.9%	0.014
58	Length of Last Word	Easy	32.1%	0.013
146	LRU Cache	Hard	21.4%	0.02
415	Add Strings	Easy	42.1%	0.024
139	Word Break	Medium	32.6%	0.008
221	Maximal Square	Medium	31.2%	0.024
11	Container With Most Water	Medium	38.9%	0.006
62	Unique Paths	Medium	44.4%	0.01
446	Arithmetic Slices II - Subsequence	Hard	28.1%	0.166

Amazon

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.521
2	Add Two Numbers	Medium	29.2%	0.035
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.106
4	Median of Two Sorted Arrays	Hard	23.9%	0.039
5	Longest Palindromic Substring	Medium	25.6%	0.133
7	Reverse Integer	Easy	24.4%	0.003
8	String to Integer (atoi)	Medium	14.1%	0.028
9	Palindrome Number	Easy	38.5%	0.011
11	Container With Most Water	Medium	38.9%	0.006
12	Integer to Roman	Medium	47.7%	0.049
13	Roman to Integer	Easy	49.5%	0.054
16	3Sum Closest	Medium	32.6%	0.011
17	Letter Combinations of a Phone Number	Medium	38.2%	0.059
20	Valid Parentheses	Easy	34.6%	0.035
21	Merge Two Sorted Lists	Easy	43.2%	0.093
22	Generate Parentheses	Medium	50.2%	0.049
23	Merge k Sorted Lists	Hard	30.3%	0.638
24	Swap Nodes in Pairs	Medium	40.9%	0.026
25	Reverse Nodes in k-Group	Hard	33.3%	0.017
27	Remove Element	Easy	42.0%	0.008
31	Next Permutation	Medium	29.3%	0.067
32	Longest Valid Parentheses	Hard	23.8%	0.03
33	Search in Rotated Sorted Array	Medium	32.1%	0.015
34	Find First and Last Position of Element in Sorted Array	Medium	32.0%	0.01
36	Valid Sudoku	Medium	39.5%	0.013
39	Combination Sum	Medium	43.7%	0.064
41	First Missing Positive	Hard	26.8%	0.03
42	Trapping Rain Water	Hard	39.2%	0.316
45	Jump Game II	Hard	26.4%	0.019
46	Permutations	Medium	50.1%	0.008
48	Rotate Image	Medium	44.1%	0.011
49	Group Anagrams	Medium	41.3%	0.018
50	Pow(x, n)	Medium	26.6%	0.055
51	N-Queens	Hard	35.3%	0.025
53	Maximum Subarray	Easy	41.3%	0.059
54	Spiral Matrix	Medium	28.2%	0.06
55	Jump Game	Medium	30.2%	0.011
56	Merge Intervals	Medium	33.1%	0.062
59	Spiral Matrix II	Medium	43.1%	0.023
60	Permutation Sequence	Medium	30.7%	0.025
63	Unique Paths II	Medium	32.6%	0.014
64	Minimum Path Sum	Medium	43.0%	0.012
67	Add Binary	Easy	35.8%	0.01
69	Sqrt(x)	Easy	29.5%	0.019
70	Climbing Stairs	Easy	42.1%	0.1
71	Simplify Path	Medium	27.1%	0.028
72	Edit Distance	Hard	34.2%	0.037
73	Set Matrix Zeroes	Medium	37.6%	0.056
74	Search a 2D Matrix	Medium	34.4%	0.092
75	Sort Colors	Medium	40.0%	0.011
76	Minimum Window Substring	Hard	28.2%	0.075
78	Subsets	Medium	47.8%	0.019
79	Word Search	Medium	29.0%	0.126
84	Largest Rectangle in Histogram	Hard	28.7%	0.04
88	Merge Sorted Array	Easy	33.3%	0.017
91	Decode Ways	Medium	21.0%	0.09
93	Restore IP Addresses	Medium	29.4%	0.103
97	Interleaving String	Hard	26.1%	0.035
98	Validate Binary Search Tree	Medium	24.4%	0.038
99	Recover Binary Search Tree	Hard	32.3%	0.032
100	Same Tree	Easy	48.5%	0.018
101	Symmetric Tree	Easy	41.4%	0.046
102	Binary Tree Level Order Traversal	Medium	44.7%	0.046
103	Binary Tree Zigzag Level Order Traversal	Medium	38.5%	0.13
104	Maximum Depth of Binary Tree	Easy	56.9%	0.006
110	Balanced Binary Tree	Easy	39.2%	0.011
111	Minimum Depth of Binary Tree	Easy	34.1%	0.011
112	Path Sum	Easy	35.9%	0.023
113	Path Sum II	Medium	37.5%	0.015
117	Populating Next Right Pointers in Each Node II	Medium	33.5%	0.019
120	Triangle	Medium	36.5%	0.019
121	Best Time to Buy and Sell Stock	Easy	44.4%	0.061
122	Best Time to Buy and Sell Stock II	Easy	49.2%	0.018
124	Binary Tree Maximum Path Sum	Hard	28.0%	0.033
125	Valid Palindrome	Easy	28.5%	0.008
126	Word Ladder II	Hard	15.7%	0.058
127	Word Ladder	Medium	21.1%	0.469
128	Longest Consecutive Sequence	Hard	39.4%	0.033
130	Surrounded Regions	Medium	20.8%	0.02
131	Palindrome Partitioning	Medium	37.5%	0.025
133	Clone Graph	Medium	25.1%	0.132
134	Gas Station	Medium	31.3%	0.089
136	Single Number	Easy	57.0%	0.006
138	Copy List with Random Pointer	Medium	25.6%	0.827
139	Word Break	Medium	32.6%	0.127
140	Word Break II	Hard	25.4%	0.285
141	Linked List Cycle	Easy	34.6%	0.027
146	LRU Cache	Hard	21.4%	1.376
149	Max Points on a Line	Hard	15.3%	0.028
150	Evaluate Reverse Polish Notation	Medium	29.8%	0.043
151	Reverse Words in a String	Medium	15.7%	0.011
153	Find Minimum in Rotated Sorted Array	Medium	41.6%	0.011
155	Min Stack	Easy	33.2%	0.081
160	Intersection of Two Linked Lists	Easy	30.7%	0.036
165	Compare Version Numbers	Medium	21.6%	0.187
167	Two Sum II - Input array is sorted	Easy	47.6%	0.059
173	Binary Search Tree Iterator	Medium	44.6%	0.014
176	Second Highest Salary	Easy	24.4%	0.015
179	Largest Number	Medium	24.3%	0.023
186	Reverse Words in a String II	Medium	33.5%	0.035
198	House Robber	Easy	40.4%	0.008
199	Binary Tree Right Side View	Medium	44.3%	0.099
200	Number of Islands	Medium	38.0%	1.263
203	Remove Linked List Elements	Easy	34.2%	0.014
204	Count Primes	Easy	27.1%	0.028
206	Reverse Linked List	Easy	49.4%	0.011
207	Course Schedule	Medium	34.9%	0.052
208	Implement Trie (Prefix Tree)	Medium	33.6%	0.034
210	Course Schedule II	Medium	31.7%	0.075
211	Add and Search Word - Data structure design	Medium	27.0%	0.028
212	Word Search II	Hard	25.9%	0.093
215	Kth Largest Element in an Array	Medium	42.9%	0.071
221	Maximal Square	Medium	31.2%	0.141
224	Basic Calculator	Hard	29.9%	0.1
230	Kth Smallest Element in a BST	Medium	47.5%	0.079
231	Power of Two	Easy	41.1%	0.039
232	Implement Queue using Stacks	Easy	39.7%	0.024
235	Lowest Common Ancestor of a Binary Search Tree	Easy	41.3%	0.051
236	Lowest Common Ancestor of a Binary Tree	Medium	32.0%	0.107
238	Product of Array Except Self	Medium	51.7%	0.08
239	Sliding Window Maximum	Hard	35.4%	0.427
240	Search a 2D Matrix II	Medium	39.4%	0.274
242	Valid Anagram	Easy	48.9%	0.01
251	Flatten 2D Vector	Medium	42.1%	0.053
252	Meeting Rooms	Easy	49.8%	0.026
253	Meeting Rooms II	Medium	40.1%	0.08
257	Binary Tree Paths	Easy	43.1%	0.014
261	Graph Valid Tree	Medium	38.8%	0.038
268	Missing Number	Easy	46.1%	0.041
269	Alien Dictionary	Hard	27.6%	0.421
273	Integer to English Words	Hard	23.1%	0.113
285	Inorder Successor in BST	Medium	33.9%	0.024
286	Walls and Gates	Medium	46.5%	0.041
287	Find the Duplicate Number	Medium	46.0%	0.027
289	Game of Life	Medium	39.6%	0.022
295	Find Median from Data Stream	Hard	31.7%	0.458
297	Serialize and Deserialize Binary Tree	Hard	36.7%	0.164
300	Longest Increasing Subsequence	Medium	39.3%	0.024
312	Burst Balloons	Hard	44.5%	0.037
314	Binary Tree Vertical Order Traversal	Medium	38.7%	0.13
315	Count of Smaller Numbers After Self	Hard	35.6%	0.072
317	Shortest Distance from All Buildings	Hard	35.3%	0.07
322	Coin Change	Medium	27.3%	0.138
329	Longest Increasing Path in a Matrix	Hard	37.8%	0.03
341	Flatten Nested List Iterator	Medium	44.4%	0.02
347	Top K Frequent Elements	Medium	51.0%	0.064
380	Insert Delete GetRandom O(1)	Medium	40.6%	0.214
387	First Unique Character in a String	Easy	47.6%	0.116
394	Decode String	Medium	42.2%	0.02
445	Add Two Numbers II	Medium	47.4%	0.024
449	Serialize and Deserialize BST	Medium	43.4%	0.037
454	4Sum II	Medium	48.3%	0.026
460	LFU Cache	Hard	26.2%	0.099
490	The Maze	Medium	44.3%	0.044
508	Most Frequent Subtree Sum	Medium	52.8%	0.048
535	Encode and Decode TinyURL	Medium	74.3%	0.098
543	Diameter of Binary Tree	Easy	45.2%	0.049
545	Boundary of Binary Tree	Medium	33.0%	0.082
572	Subtree of Another Tree	Easy	40.3%	0.04
617	Merge Two Binary Trees	Easy	68.4%	0.064
628	Maximum Product of Three Numbers	Easy	44.8%	0.03
642	Design Search Autocomplete System	Hard	31.8%	0.237
647	Palindromic Substrings	Medium	54.5%	0.038
652	Find Duplicate Subtrees	Medium	40.2%	0.134
653	Two Sum IV - Input is a BST	Easy	50.6%	0.171
657	Robot Return to Origin	Easy	69.1%	0.011
658	Find K Closest Elements	Medium	34.8%	0.029
669	Trim a Binary Search Tree	Easy	58.5%	0.023
675	Cut Off Trees for Golf Event	Hard	27.5%	0.229
682	Baseball Game	Easy	58.6%	0.035
692	Top K Frequent Words	Medium	42.4%	0.259
694	Number of Distinct Islands	Medium	46.3%	0.154
695	Max Area of Island	Easy	53.1%	0.129
733	Flood Fill	Easy	48.0%	0.027
739	Daily Temperatures	Medium	55.3%	0.039
746	Min Cost Climbing Stairs	Easy	44.1%	0.018
763	Partition Labels	Medium	65.3%	0.171
767	Reorganize String	Medium	38.9%	0.031
703	Kth Largest Element in a Stream	Easy	35.6%	0.07
785	Is Graph Bipartite?	Medium	39.9%	0.026
787	Cheapest Flights Within K Stops	Medium	30.5%	0.031
819	Most Common Word	Easy	43.9%	3.167
622	Design Circular Queue	Medium	36.4%	0.03
836	Rectangle Overlap	Easy	43.7%	0.069
860	Lemonade Change	Easy	49.4%	0.031
863	All Nodes Distance K in Binary Tree	Medium	41.7%	0.108

Appdynamics

#	Title	Difficulty	Acceptance	Frequency
200	Number of Islands	Medium	38.0%	0.006

Apple

#	Title	Difficulty	Acceptance	Frequency
206	Reverse Linked List	Easy	49.4%	0.02
8	String to Integer (atoi)	Medium	14.1%	0.016
237	Delete Node in a Linked List	Easy	49.3%	0.025
33	Search in Rotated Sorted Array	Medium	32.1%	0.007
23	Merge k Sorted Lists	Hard	30.3%	0.029
2	Add Two Numbers	Medium	29.2%	0.007
53	Maximum Subarray	Easy	41.3%	0.031
21	Merge Two Sorted Lists	Easy	43.2%	0.005
125	Valid Palindrome	Easy	28.5%	0.018
1	Two Sum	Easy	38.9%	0.124
238	Product of Array Except Self	Medium	51.7%	0.056
236	Lowest Common Ancestor of a Binary Tree	Medium	32.0%	0.021
382	Linked List Random Node	Medium	47.9%	0.058
54	Spiral Matrix	Medium	28.2%	0.06
139	Word Break	Medium	32.6%	0.019
49	Group Anagrams	Medium	41.3%	0.008
146	LRU Cache	Hard	21.4%	0.46
101	Symmetric Tree	Easy	41.4%	0.007
403	Frog Jump	Hard	33.6%	0.186
56	Merge Intervals	Medium	33.1%	0.062
55	Jump Game	Medium	30.2%	0.011
341	Flatten Nested List Iterator	Medium	44.4%	0.043
486	Predict the Winner	Medium	45.6%	0.034
200	Number of Islands	Medium	38.0%	0.013
387	First Unique Character in a String	Easy	47.6%	0.017
295	Find Median from Data Stream	Hard	31.7%	0.051
10	Regular Expression Matching	Hard	24.4%	0.022
315	Count of Smaller Numbers After Self	Hard	35.6%	0.072
165	Compare Version Numbers	Medium	21.6%	0.05
120	Triangle	Medium	36.5%	0.019
190	Reverse Bits	Easy	29.3%	0.075
191	Number of 1 Bits	Easy	40.9%	0.015
242	Valid Anagram	Easy	48.9%	0.01
412	Fizz Buzz	Easy	58.0%	0.011
17	Letter Combinations of a Phone Number	Medium	38.2%	0.007
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.019
68	Text Justification	Hard	21.0%	0.09
102	Binary Tree Level Order Traversal	Medium	44.7%	0.046
300	Longest Increasing Subsequence	Medium	39.3%	0.011
76	Minimum Window Substring	Hard	28.2%	0.012
724	Find Pivot Index	Easy	39.4%	0.017
543	Diameter of Binary Tree	Easy	45.2%	0.012
249	Group Shifted Strings	Medium	46.1%	0.055
108	Convert Sorted Array to Binary Search Tree	Easy	46.6%	0.011
692	Top K Frequent Words	Medium	42.4%	0.024
208	Implement Trie (Prefix Tree)	Medium	33.6%	0.034
281	Zigzag Iterator	Medium	54.0%	0.052
215	Kth Largest Element in an Array	Medium	42.9%	0.008
479	Largest Palindrome Product	Easy	26.1%	0.141
380	Insert Delete GetRandom O(1)	Medium	40.6%	0.019
155	Min Stack	Easy	33.2%	0.009
199	Binary Tree Right Side View	Medium	44.3%	0.016
116	Populating Next Right Pointers in Each Node	Medium	36.6%	0.016
706	Design HashMap	Easy	44.3%	0.037

Arista Networks

#	Title	Difficulty	Acceptance	Frequency
21	Merge Two Sorted Lists	Easy	43.2%	0.011
165	Compare Version Numbers	Medium	21.6%	0.023
268	Missing Number	Easy	46.1%	0.011

Baidu

#	Title	Difficulty	Acceptance	Frequency
146	LRU Cache	Hard	21.4%	0.009
2	Add Two Numbers	Medium	29.2%	0.018
1	Two Sum	Easy	38.9%	0.077
20	Valid Parentheses	Easy	34.6%	0.004
5	Longest Palindromic Substring	Medium	25.6%	0.005
145	Binary Tree Postorder Traversal	Hard	44.4%	0.014
169	Majority Element	Easy	49.6%	0.01
206	Reverse Linked List	Easy	49.4%	0.02
54	Spiral Matrix	Medium	28.2%	0.01
141	Linked List Cycle	Easy	34.6%	0.007
4	Median of Two Sorted Arrays	Hard	23.9%	0.025
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.007
33	Search in Rotated Sorted Array	Medium	32.1%	0.015
72	Edit Distance	Hard	34.2%	0.065
48	Rotate Image	Medium	44.1%	0.011
347	Top K Frequent Elements	Medium	51.0%	0.011
148	Sort List	Medium	31.8%	0.046
80	Remove Duplicates from Sorted Array II	Medium	38.2%	0.019
724	Find Pivot Index	Easy	39.4%	0.017
88	Merge Sorted Array	Easy	33.3%	0.007

Blackrock

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.004
238	Product of Array Except Self	Medium	51.7%	0.009

Blizzard

#	Title	Difficulty	Acceptance	Frequency
20	Valid Parentheses	Easy	34.6%	0.013

Bloomberg

#	Title	Difficulty	Acceptance	Frequency
387	First Unique Character in a String	Easy	47.6%	0.008
205	Isomorphic Strings	Easy	35.5%	0.03
70	Climbing Stairs	Easy	42.1%	0.015
20	Valid Parentheses	Easy	34.6%	0.155
1	Two Sum	Easy	38.9%	0.026
138	Copy List with Random Pointer	Medium	25.6%	0.279
98	Validate Binary Search Tree	Medium	24.4%	0.025
200	Number of Islands	Medium	38.0%	0.024
242	Valid Anagram	Easy	48.9%	0.06
463	Island Perimeter	Easy	58.6%	0.018
347	Top K Frequent Elements	Medium	51.0%	0.041
102	Binary Tree Level Order Traversal	Medium	44.7%	0.008
121	Best Time to Buy and Sell Stock	Easy	44.4%	0.061
451	Sort Characters By Frequency	Medium	52.9%	0.054
283	Move Zeroes	Easy	52.4%	0.013
698	Partition to K Equal Sum Subsets	Medium	38.7%	0.038
33	Search in Rotated Sorted Array	Medium	32.1%	0.015
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.106
380	Insert Delete GetRandom O(1)	Medium	40.6%	0.019
582	Kill Process	Medium	52.6%	0.137
26	Remove Duplicates from Sorted Array	Easy	37.8%	0.005
60	Permutation Sequence	Medium	30.7%	0.025
153	Find Minimum in Rotated Sorted Array	Medium	41.6%	0.011
10	Regular Expression Matching	Hard	24.4%	0.039
42	Trapping Rain Water	Hard	39.2%	0.054
554	Brick Wall	Medium	46.8%	0.062
253	Meeting Rooms II	Medium	40.1%	0.08
162	Find Peak Element	Medium	39.7%	0.027
62	Unique Paths	Medium	44.4%	0.01
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	36.7%	0.048
80	Remove Duplicates from Sorted Array II	Medium	38.2%	0.019
412	Fizz Buzz	Easy	58.0%	0.024
146	LRU Cache	Hard	21.4%	0.206
139	Word Break	Medium	32.6%	0.051
234	Palindrome Linked List	Easy	34.2%	0.01
46	Permutations	Medium	50.1%	0.017
836	Rectangle Overlap	Easy	43.7%	0.031
118	Pascal's Triangle	Easy	42.1%	0.013
25	Reverse Nodes in k-Group	Hard	33.3%	0.017
821	Shortest Distance to a Character	Easy	60.7%	0.029
572	Subtree of Another Tree	Easy	40.3%	0.018
724	Find Pivot Index	Easy	39.4%	0.017
23	Merge k Sorted Lists	Hard	30.3%	0.016
235	Lowest Common Ancestor of a Binary Search Tree	Easy	41.3%	0.013
7	Reverse Integer	Easy	24.4%	0.042
155	Min Stack	Easy	33.2%	0.021
301	Remove Invalid Parentheses	Hard	36.5%	0.081
236	Lowest Common Ancestor of a Binary Tree	Medium	32.0%	0.009
445	Add Two Numbers II	Medium	47.4%	0.024
140	Word Break II	Hard	25.4%	0.045
311	Sparse Matrix Multiplication	Medium	53.7%	0.071
239	Sliding Window Maximum	Hard	35.4%	0.039
739	Daily Temperatures	Medium	55.3%	0.068
811	Subdomain Visit Count	Easy	61.2%	0.031
797	All Paths From Source to Target	Medium	67.2%	0.051
203	Remove Linked List Elements	Easy	34.2%	0.014
127	Word Ladder	Medium	21.1%	0.012
567	Permutation in String	Medium	36.6%	0.033
394	Decode String	Medium	42.2%	0.045
460	LFU Cache	Hard	26.2%	0.045

Bookingcom

#	Title	Difficulty	Acceptance	Frequency
289	Game of Life	Medium	39.6%	0.044

Box

#	Title	Difficulty	Acceptance	Frequency
250	Count Univalue Subtrees	Medium	45.7%	0.203

Capital One

#	Title	Difficulty	Acceptance	Frequency
98	Validate Binary Search Tree	Medium	24.4%	0.025
2	Add Two Numbers	Medium	29.2%	0.003
23	Merge k Sorted Lists	Hard	30.3%	0.029
273	Integer to English Words	Hard	23.1%	0.042

Cisco

#	Title	Difficulty	Acceptance	Frequency
2	Add Two Numbers	Medium	29.2%	0.007
1	Two Sum	Easy	38.9%	0.015
146	LRU Cache	Hard	21.4%	0.009
253	Meeting Rooms II	Medium	40.1%	0.013

Citadel

#	Title	Difficulty	Acceptance	Frequency
188	Best Time to Buy and Sell Stock IV	Hard	25.3%	0.036
121	Best Time to Buy and Sell Stock	Easy	44.4%	0.005
122	Best Time to Buy and Sell Stock II	Easy	49.2%	0.008

Citrix

#	Title	Difficulty	Acceptance	Frequency
14	Longest Common Prefix	Easy	32.0%	0.006

Cloudera

#	Title	Difficulty	Acceptance	Frequency
173	Binary Search Tree Iterator	Medium	44.6%	0.082
20	Valid Parentheses	Easy	34.6%	0.035
13	Roman to Integer	Easy	49.5%	0.014
476	Number Complement	Easy	61.4%	0.028

Coupang

#	Title	Difficulty	Acceptance	Frequency
23	Merge k Sorted Lists	Hard	30.3%	0.007
32	Longest Valid Parentheses	Hard	23.8%	0.014

Coursera

#	Title	Difficulty	Acceptance	Frequency
10	Regular Expression Matching	Hard	24.4%	0.022
1	Two Sum	Easy	38.9%	0.004
68	Text Justification	Hard	21.0%	0.091
761	Special Binary String	Hard	45.3%	0.278

Cryptic Studios

#	Title	Difficulty	Acceptance	Frequency

Databricks

#	Title	Difficulty	Acceptance	Frequency
742	Closest Leaf in a Binary Tree	Medium	35.9%	0.107
41	First Missing Positive	Hard	26.8%	0.03

Dataminr

#	Title	Difficulty	Acceptance	Frequency
42	Trapping Rain Water	Hard	39.2%	0.008
54	Spiral Matrix	Medium	28.2%	0.009

Deutsche Bank

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.003

Doordash

#	Title	Difficulty	Acceptance	Frequency
200	Number of Islands	Medium	38.0%	0.006
121	Best Time to Buy and Sell Stock	Easy	44.4%	0.005

Drawbridge

#	Title	Difficulty	Acceptance	Frequency
697	Degree of an Array	Easy	47.3%	0.204
402	Remove K Digits	Medium	25.6%	0.06
757	Set Intersection Size At Least Two	Hard	34.8%	0.478
1	Two Sum	Easy	38.9%	0.002

Dropbox

#	Title	Difficulty	Acceptance	Frequency
291	Word Pattern II	Hard	39.0%	0.1
289	Game of Life	Medium	39.6%	0.653
609	Find Duplicate File in System	Medium	52.9%	1.748
23	Merge k Sorted Lists	Hard	30.3%	0.007
379	Design Phone Directory	Medium	37.9%	0.241
362	Design Hit Counter	Medium	56.1%	0.059

Ebay

#	Title	Difficulty	Acceptance	Frequency
232	Implement Queue using Stacks	Easy	39.7%	0.024
146	LRU Cache	Hard	21.4%	0.009
1	Two Sum	Easy	38.9%	0.002
15	3Sum	Medium	22.1%	0.005
200	Number of Islands	Medium	38.0%	0.013
103	Binary Tree Zigzag Level Order Traversal	Medium	38.5%	0.025
66	Plus One	Easy	40.0%	0.006
344	Reverse String	Easy	61.5%	0.006
102	Binary Tree Level Order Traversal	Medium	44.7%	0.008
702	Search in a Sorted Array of Unknown Size	Medium	40.0%	0.122
703	Kth Largest Element in a Stream	Easy	35.6%	0.032

Emc

#	Title	Difficulty	Acceptance	Frequency
21	Merge Two Sorted Lists	Easy	43.2%	0.005
2	Add Two Numbers	Medium	29.2%	0.003
139	Word Break	Medium	32.6%	0.008
153	Find Minimum in Rotated Sorted Array	Medium	41.6%	0.011
206	Reverse Linked List	Easy	49.5%	0.011

Epic Systems

#	Title	Difficulty	Acceptance	Frequency
54	Spiral Matrix	Medium	28.2%	0.039
306	Additive Number	Medium	27.9%	0.099
1	Two Sum	Easy	38.9%	0.007
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.003

Expedia

#	Title	Difficulty	Acceptance	Frequency
152	Maximum Product Subarray	Medium	27.5%	0.012
238	Product of Array Except Self	Medium	51.7%	0.021
32	Longest Valid Parentheses	Hard	23.8%	0.014
206	Reverse Linked List	Easy	49.5%	0.005

Facebook

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.099
2	Add Two Numbers	Medium	29.2%	0.003
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.09
4	Median of Two Sorted Arrays	Hard	23.9%	0.056
5	Longest Palindromic Substring	Medium	25.6%	0.005
7	Reverse Integer	Easy	24.4%	0.003
8	String to Integer (atoi)	Medium	14.1%	0.028
10	Regular Expression Matching	Hard	24.4%	1.026
11	Container With Most Water	Medium	38.9%	0.006
12	Integer to Roman	Medium	47.7%	0.013
13	Roman to Integer	Easy	49.5%	0.054
15	3Sum	Medium	22.1%	1.496
17	Letter Combinations of a Phone Number	Medium	38.2%	0.251
18	4Sum	Medium	28.3%	0.056
19	Remove Nth Node From End of List	Medium	33.6%	0.015
20	Valid Parentheses	Easy	34.6%	0.202
21	Merge Two Sorted Lists	Easy	43.2%	0.043
23	Merge k Sorted Lists	Hard	30.3%	0.202
24	Swap Nodes in Pairs	Medium	40.9%	0.011
26	Remove Duplicates from Sorted Array	Easy	37.8%	0.018
29	Divide Two Integers	Medium	15.7%	0.883
30	Substring with Concatenation of All Words	Hard	22.4%	0.068
31	Next Permutation	Medium	29.3%	1.059
32	Longest Valid Parentheses	Hard	23.8%	0.156
33	Search in Rotated Sorted Array	Medium	32.1%	0.079
34	Find First and Last Position of Element in Sorted Array	Medium	32.0%	0.06
38	Count and Say	Easy	37.9%	0.011
39	Combination Sum	Medium	43.7%	0.01
42	Trapping Rain Water	Hard	39.2%	0.236
43	Multiply Strings	Medium	28.7%	0.219
44	Wildcard Matching	Hard	21.6%	0.043
46	Permutations	Medium	50.1%	0.017
49	Group Anagrams	Medium	41.3%	0.008
50	Pow(x, n)	Medium	26.6%	0.169
51	N-Queens	Hard	35.3%	0.149
52	N-Queens II	Hard	48.7%	0.036
53	Maximum Subarray	Easy	41.3%	0.031
56	Merge Intervals	Medium	33.1%	0.623
57	Insert Interval	Hard	29.7%	0.079
65	Valid Number	Hard	13.1%	0.79
67	Add Binary	Easy	35.8%	0.978
75	Sort Colors	Medium	40.0%	0.024
76	Minimum Window Substring	Hard	28.2%	0.699
78	Subsets	Medium	47.8%	0.019
79	Word Search	Medium	29.0%	0.011
81	Search in Rotated Sorted Array II	Medium	32.4%	0.018
84	Largest Rectangle in Histogram	Hard	28.7%	0.018
88	Merge Sorted Array	Easy	33.3%	0.349
91	Decode Ways	Medium	21.0%	1.161
94	Binary Tree Inorder Traversal	Medium	52.3%	0.006
98	Validate Binary Search Tree	Medium	24.4%	0.445
99	Recover Binary Search Tree	Hard	32.3%	0.183
101	Symmetric Tree	Easy	41.4%	0.017
102	Binary Tree Level Order Traversal	Medium	44.7%	0.017
103	Binary Tree Zigzag Level Order Traversal	Medium	38.5%	0.068
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	36.7%	0.012
109	Convert Sorted List to Binary Search Tree	Medium	37.4%	0.021
110	Balanced Binary Tree	Easy	39.2%	0.011
111	Minimum Depth of Binary Tree	Easy	34.1%	0.024
113	Path Sum II	Medium	37.5%	0.015
114	Flatten Binary Tree to Linked List	Medium	38.6%	0.084
121	Best Time to Buy and Sell Stock	Easy	44.4%	0.911
123	Best Time to Buy and Sell Stock III	Hard	31.5%	0.088
124	Binary Tree Maximum Path Sum	Hard	28.0%	0.544
125	Valid Palindrome	Easy	28.5%	0.375
126	Word Ladder II	Hard	15.7%	0.026
127	Word Ladder	Medium	21.1%	0.073
128	Longest Consecutive Sequence	Hard	39.4%	0.058
129	Sum Root to Leaf Numbers	Medium	39.5%	0.02
133	Clone Graph	Medium	25.1%	0.389
136	Single Number	Easy	57.0%	0.006
137	Single Number II	Medium	43.8%	0.032
138	Copy List with Random Pointer	Medium	25.6%	0.064
139	Word Break	Medium	32.6%	0.192
140	Word Break II	Hard	25.4%	0.02
141	Linked List Cycle	Easy	34.6%	0.007
143	Reorder List	Medium	28.1%	0.661
146	LRU Cache	Hard	21.4%	0.415
151	Reverse Words in a String	Medium	15.7%	0.025
157	Read N Characters Given Read4	Easy	28.2%	0.036
158	Read N Characters Given Read4 II - Call multiple times	Hard	24.3%	0.966
160	Intersection of Two Linked Lists	Easy	30.7%	0.009
161	One Edit Distance	Medium	31.3%	0.086
162	Find Peak Element	Medium	39.7%	0.047
170	Two Sum III - Data structure design	Easy	27.8%	0.043
173	Binary Search Tree Iterator	Medium	44.6%	0.743
176	Second Highest Salary	Easy	24.4%	0.015
199	Binary Tree Right Side View	Medium	44.3%	0.185
200	Number of Islands	Medium	38.0%	0.259
206	Reverse Linked List	Easy	49.5%	0.14
207	Course Schedule	Medium	34.9%	0.013
208	Implement Trie (Prefix Tree)	Medium	33.6%	0.034
209	Minimum Size Subarray Sum	Medium	33.2%	0.065
210	Course Schedule II	Medium	31.7%	0.043
211	Add and Search Word - Data structure design	Medium	27.0%	0.454
212	Word Search II	Hard	25.9%	0.024
215	Kth Largest Element in an Array	Medium	42.9%	0.687
227	Basic Calculator II	Medium	31.1%	0.365
236	Lowest Common Ancestor of a Binary Tree	Medium	32.0%	0.417
238	Product of Array Except Self	Medium	51.7%	0.419
239	Sliding Window Maximum	Hard	35.4%	0.039
242	Valid Anagram	Easy	48.9%	0.01
246	Strobogrammatic Number	Easy	40.8%	0.268
247	Strobogrammatic Number II	Medium	41.9%	0.287
252	Meeting Rooms	Easy	49.8%	0.101
253	Meeting Rooms II	Medium	40.1%	1.074
257	Binary Tree Paths	Easy	43.1%	0.354
259	3Sum Smaller	Medium	43.1%	0.054
260	Single Number III	Medium	54.5%	0.039
261	Graph Valid Tree	Medium	38.8%	0.038
269	Alien Dictionary	Hard	27.6%	0.337
270	Closest Binary Search Tree Value	Easy	41.7%	0.062
273	Integer to English Words	Hard	23.1%	2.527
277	Find the Celebrity	Medium	35.2%	0.529
278	First Bad Version	Easy	27.1%	0.541
280	Wiggle Sort	Medium	59.4%	0.032
281	Zigzag Iterator	Medium	54.0%	0.052
282	Expression Add Operators	Hard	31.1%	0.264
283	Move Zeroes	Easy	52.4%	0.422
286	Walls and Gates	Medium	46.5%	0.091
295	Find Median from Data Stream	Hard	31.7%	0.023
297	Serialize and Deserialize Binary Tree	Hard	36.7%	0.778
300	Longest Increasing Subsequence	Medium	39.3%	0.066
301	Remove Invalid Parentheses	Hard	36.5%	2.373
304	Range Sum Query 2D - Immutable	Medium	28.9%	0.257
305	Number of Islands II	Hard	40.2%	0.101
314	Binary Tree Vertical Order Traversal	Medium	38.7%	0.197
317	Shortest Distance from All Buildings	Hard	35.3%	0.255
325	Maximum Size Subarray Sum Equals k	Medium	43.5%	0.432
336	Palindrome Pairs	Hard	28.1%	0.186
339	Nested List Weight Sum	Easy	64.9%	0.036
340	Longest Substring with At Most K Distinct Characters	Hard	38.4%	0.032
341	Flatten Nested List Iterator	Medium	44.4%	0.043
346	Moving Average from Data Stream	Easy	62.2%	0.089
347	Top K Frequent Elements	Medium	51.0%	0.024
348	Design Tic-Tac-Toe	Medium	46.9%	0.168
349	Intersection of Two Arrays	Easy	49.8%	0.558
350	Intersection of Two Arrays II	Easy	44.8%	0.231
360	Sort Transformed Array	Medium	45.5%	0.067
371	Sum of Two Integers	Easy	50.9%	0.02
381	Insert Delete GetRandom O(1) - Duplicates allowed	Hard	30.1%	0.219
387	First Unique Character in a String	Easy	47.6%	0.09
393	UTF-8 Validation	Medium	34.9%	0.054
395	Longest Substring with At Least K Repeating Characters	Medium	36.3%	0.088
398	Random Pick Index	Medium	46.3%	0.101
399	Evaluate Division	Medium	43.4%	0.128
403	Frog Jump	Hard	33.6%	0.071
415	Add Strings	Easy	42.1%	0.257
432	All O`one Data Structure	Hard	28.2%	0.205
437	Path Sum III	Easy	40.5%	0.046
438	Find All Anagrams in a String	Easy	34.4%	0.993
449	Serialize and Deserialize BST	Medium	43.4%	0.081
463	Island Perimeter	Easy	58.6%	0.071
468	Validate IP Address	Medium	20.5%	0.055
490	The Maze	Medium	44.3%	0.044
491	Increasing Subsequences	Medium	39.7%	0.113
493	Reverse Pairs	Hard	21.1%	0.121
498	Diagonal Traverse	Medium	44.3%	0.077
505	The Maze II	Medium	39.7%	0.066
518	Coin Change 2	Medium	38.0%	0.028
523	Continuous Subarray Sum	Medium	23.5%	0.462
543	Diameter of Binary Tree	Easy	45.2%	0.644
560	Subarray Sum Equals K	Medium	40.1%	0.529
567	Permutation in String	Medium	36.6%	0.072
597	Friend Requests I: Overall Acceptance Rate	Easy	37.8%	0.135
621	Task Scheduler	Medium	42.8%	1.229
636	Exclusive Time of Functions	Medium	45.4%	0.184
642	Design Search Autocomplete System	Hard	31.8%	0.065
647	Palindromic Substrings	Medium	54.5%	0.038
658	Find K Closest Elements	Medium	34.8%	0.029
674	Longest Continuous Increasing Subsequence	Easy	42.9%	0.055
680	Valid Palindrome II	Easy	32.6%	0.898
681	Next Closest Time	Medium	41.3%	0.021
688	Knight Probability in Chessboard	Medium	40.8%	0.06
689	Maximum Sum of 3 Non-Overlapping Subarrays	Hard	41.9%	0.755
692	Top K Frequent Words	Medium	42.4%	0.092
721	Accounts Merge	Medium	35.6%	0.412
733	Flood Fill	Easy	48.0%	0.027
426	Convert Binary Search Tree to Sorted Doubly Linked List	Medium	37.2%	0.748
430	Flatten a Multilevel Doubly Linked List	Medium	33.5%	0.048
767	Reorganize String	Medium	38.8%	0.031
772	Basic Calculator III	Hard	41.6%	0.17
785	Is Graph Bipartite?	Medium	39.9%	0.352
791	Custom Sort String	Medium	59.4%	0.258
708	Insert into a Cyclic Sorted List	Medium	22.7%	0.058
824	Goat Latin	Easy	54.8%	0.075
825	Friends Of Appropriate Ages	Medium	32.1%	0.222
622	Design Circular Queue	Medium	36.4%	0.03
489	Robot Room Cleaner	Hard	50.1%	0.093
844	Backspace String Compare	Easy	43.8%	0.042
862	Shortest Subarray with Sum at Least K	Hard	18.8%	0.101
886	Possible Bipartition	Medium	38.6%	0.045
896	Monotonic Array	Easy	54.7%	0.005

Fallible

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.003

Flipkart

#	Title	Difficulty	Acceptance	Frequency
75	Sort Colors	Medium	40.0%	0.009

Forusall

#	Title	Difficulty	Acceptance	Frequency
272	Closest Binary Search Tree Value II	Hard	41.6%	0.07

Garena

#	Title	Difficulty	Acceptance	Frequency
810	Chalkboard XOR Game	Hard	40.9%	0

Ge Digital

#	Title	Difficulty	Acceptance	Frequency
697	Degree of an Array	Easy	47.4%	0

Gilt Groupe

#	Title	Difficulty	Acceptance	Frequency
2	Add Two Numbers	Medium	29.2%	0.005
1	Two Sum	Easy	38.9%	0.003
20	Valid Parentheses	Easy	34.6%	0.003

Godaddy

#	Title	Difficulty	Acceptance	Frequency
2	Add Two Numbers	Medium	29.2%	0.003

Goldman Sachs

#	Title	Difficulty	Acceptance	Frequency
70	Climbing Stairs	Easy	42.1%	0.04
8	String to Integer (atoi)	Medium	14.1%	0.016
4	Median of Two Sorted Arrays	Hard	23.9%	0.097
42	Trapping Rain Water	Hard	39.2%	0.054
240	Search a 2D Matrix II	Medium	39.4%	0.015
387	First Unique Character in a String	Easy	47.6%	0.047
153	Find Minimum in Rotated Sorted Array	Medium	41.6%	0.067
688	Knight Probability in Chessboard	Medium	40.8%	0.13
11	Container With Most Water	Medium	38.9%	0.013
49	Group Anagrams	Medium	41.3%	0.018
209	Minimum Size Subarray Sum	Medium	33.2%	0.017
121	Best Time to Buy and Sell Stock	Easy	44.4%	0.005
141	Linked List Cycle	Easy	34.6%	0.007
64	Minimum Path Sum	Medium	43.0%	0.012
443	String Compression	Easy	35.8%	0.054
200	Number of Islands	Medium	38.0%	0.006
722	Remove Comments	Medium	29.0%	1.051

Goo

#	Title	Difficulty	Acceptance	Frequency
25	Reverse Nodes in k-Group	Hard	33.3%	0.015

Google

#	Title	Difficulty	Acceptance	Frequency

Grab

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.002

Groupon

#	Title	Difficulty	Acceptance	Frequency
21	Merge Two Sorted Lists	Easy	43.2%	0.005
328	Odd Even Linked List	Medium	46.4%	0.017

Hedvig

#	Title	Difficulty	Acceptance	Frequency
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.003

Helix

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.003

Houzz

#	Title	Difficulty	Acceptance	Frequency
304	Range Sum Query 2D - Immutable	Medium	28.9%	0.031
43	Multiply Strings	Medium	28.7%	0.015

Htc

#	Title	Difficulty	Acceptance	Frequency
12	Integer to Roman	Medium	47.7%	0.023
2	Add Two Numbers	Medium	29.2%	0.01
1	Two Sum	Easy	38.9%	0.005
7	Reverse Integer	Easy	24.4%	0.003

Huawei

#	Title	Difficulty	Acceptance	Frequency
45	Jump Game II	Hard	26.4%	0.043
43	Multiply Strings	Medium	28.7%	0.034
5	Longest Palindromic Substring	Medium	25.6%	0.005

Hulu

#	Title	Difficulty	Acceptance	Frequency
238	Product of Array Except Self	Medium	51.7%	0.009
383	Ransom Note	Easy	48.4%	0.067
1	Two Sum	Easy	38.9%	0.004
148	Sort List	Medium	31.8%	0.021
53	Maximum Subarray	Easy	41.3%	0.005

Ibm

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.003
412	Fizz Buzz	Easy	58.0%	0.01
5	Longest Palindromic Substring	Medium	25.6%	0.005

Iit Bombay

#	Title	Difficulty	Acceptance	Frequency
861	Score After Flipping Matrix	Medium	67.2%	0

Indeed

#	Title	Difficulty	Acceptance	Frequency
88	Merge Sorted Array	Easy	33.3%	0.007
21	Merge Two Sorted Lists	Easy	43.2%	0.005
811	Subdomain Visit Count	Easy	61.2%	0.031

Inmobi

#	Title	Difficulty	Acceptance	Frequency
754	Reach a Number	Medium	29.0%	0

Intel

#	Title	Difficulty	Acceptance	Frequency
206	Reverse Linked List	Easy	49.5%	0.011

Intuit

#	Title	Difficulty	Acceptance	Frequency
297	Serialize and Deserialize Binary Tree	Hard	36.7%	0.014
227	Basic Calculator II	Medium	31.1%	0.083
124	Binary Tree Maximum Path Sum	Hard	28.0%	0.088
770	Basic Calculator IV	Hard	41.7%	1.056
224	Basic Calculator	Hard	29.9%	0.504
206	Reverse Linked List	Easy	49.5%	0.011
15	3Sum	Medium	22.1%	0.028
695	Max Area of Island	Easy	53.1%	0.015
56	Merge Intervals	Medium	33.1%	0.016
1	Two Sum	Easy	38.9%	0.01
42	Trapping Rain Water	Hard	39.2%	0.035
85	Maximal Rectangle	Hard	30.8%	0.064
121	Best Time to Buy and Sell Stock	Easy	44.4%	0.005
207	Course Schedule	Medium	34.9%	0.029
38	Count and Say	Easy	37.9%	0.094
13	Roman to Integer	Easy	49.5%	0.038
12	Integer to Roman	Medium	47.7%	0.013
67	Add Binary	Easy	35.8%	0.022
122	Best Time to Buy and Sell Stock II	Easy	49.2%	0.018
165	Compare Version Numbers	Medium	21.6%	0.023
146	LRU Cache	Hard	21.4%	0.036
21	Merge Two Sorted Lists	Easy	43.2%	0.005

Ixl

#	Title	Difficulty	Acceptance	Frequency
166	Fraction to Recurring Decimal	Medium	18.5%	0.032
227	Basic Calculator II	Medium	31.1%	0.022
598	Range Addition II	Easy	48.0%	0.073
234	Palindrome Linked List	Easy	34.2%	0.01
592	Fraction Addition and Subtraction	Medium	46.1%	0.259
691	Stickers to Spell Word	Hard	36.2%	0.206
39	Combination Sum	Medium	43.7%	0.01

Jane Street

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.004

Jingchi

#	Title	Difficulty	Acceptance	Frequency
772	Basic Calculator III	Hard	41.6%	0

Jpmorgan

#	Title	Difficulty	Acceptance	Frequency
9	Palindrome Number	Easy	38.5%	0.011
17	Letter Combinations of a Phone Number	Medium	38.2%	0.015
79	Word Search	Medium	29.0%	0.024

Jump Trading

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.003

Leap Motion

#	Title	Difficulty	Acceptance	Frequency
478	Generate Random Point in a Circle	Medium	33.1%	0

Lending Club

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.006
7	Reverse Integer	Easy	24.4%	0.003
20	Valid Parentheses	Easy	34.6%	0.003

Linkedin

#	Title	Difficulty	Acceptance	Frequency
366	Find Leaves of Binary Tree	Medium	62.3%	0.436
149	Max Points on a Line	Hard	15.3%	0.623
744	Find Smallest Letter Greater Than Target	Easy	42.9%	0.084
339	Nested List Weight Sum	Easy	64.9%	0.37
65	Valid Number	Hard	13.1%	0.047
716	Max Stack	Hard	37.6%	0.853
272	Closest Binary Search Tree Value II	Hard	41.6%	1.161
200	Number of Islands	Medium	38.0%	0.168
380	Insert Delete GetRandom O(1)	Medium	40.6%	0.272
1	Two Sum	Easy	38.9%	0.032
150	Evaluate Reverse Polish Notation	Medium	29.8%	0.162
53	Maximum Subarray	Easy	41.3%	0.117
152	Maximum Product Subarray	Medium	27.5%	0.074
68	Text Justification	Hard	21.0%	0.233
170	Two Sum III - Data structure design	Easy	27.8%	0.741
244	Shortest Word Distance II	Medium	43.1%	1.334
254	Factor Combinations	Medium	43.7%	0.179
12	Integer to Roman	Medium	47.7%	0.049
104	Maximum Depth of Binary Tree	Easy	56.9%	0.014
50	Pow(x, n)	Medium	26.6%	0.169
69	Sqrt(x)	Easy	29.5%	0.008
160	Intersection of Two Linked Lists	Easy	30.7%	0.009
297	Serialize and Deserialize Binary Tree	Hard	36.7%	0.123
101	Symmetric Tree	Easy	41.4%	0.088
698	Partition to K Equal Sum Subsets	Medium	38.7%	0.146
256	Paint House	Easy	47.0%	0.439
76	Minimum Window Substring	Hard	28.2%	0.012
261	Graph Valid Tree	Medium	38.8%	0.083
243	Shortest Word Distance	Easy	54.7%	0.47
364	Nested List Weight Sum II	Medium	54.6%	1.721
46	Permutations	Medium	50.1%	0.03
47	Permutations II	Medium	36.9%	0.052
20	Valid Parentheses	Easy	34.6%	0.035
323	Number of Connected Components in an Undirected Graph	Medium	49.7%	0.103
695	Max Area of Island	Easy	53.1%	0.034
282	Expression Add Operators	Hard	31.1%	0.264
56	Merge Intervals	Medium	33.1%	0.135
156	Binary Tree Upside Down	Medium	47.7%	0.168
636	Exclusive Time of Functions	Medium	45.4%	0.184
146	LRU Cache	Hard	21.4%	0.036
265	Paint House II	Hard	39.4%	0.166
611	Valid Triangle Number	Medium	42.6%	0.259
13	Roman to Integer	Easy	49.5%	0.014
235	Lowest Common Ancestor of a Binary Search Tree	Easy	41.3%	0.013
341	Flatten Nested List Iterator	Medium	44.4%	0.163
605	Can Place Flowers	Easy	30.0%	0.083
236	Lowest Common Ancestor of a Binary Tree	Medium	32.0%	0.036
671	Second Minimum Node In a Binary Tree	Easy	42.4%	0.13
72	Edit Distance	Hard	34.2%	0.017
33	Search in Rotated Sorted Array	Medium	32.1%	0.026
187	Repeated DNA Sequences	Medium	34.1%	0.199
273	Integer to English Words	Hard	23.1%	0.042
40	Combination Sum II	Medium	37.9%	0.016
349	Intersection of Two Arrays	Easy	49.8%	0.026
126	Word Ladder II	Hard	15.7%	0.026
468	Validate IP Address	Medium	20.5%	0.055
658	Find K Closest Elements	Medium	34.8%	0.029
70	Climbing Stairs	Easy	42.1%	0.007
796	Rotate String	Easy	49.0%	0.027
81	Search in Rotated Sorted Array II	Medium	32.4%	0.018
730	Count Different Palindromic Subsequences	Hard	36.6%	0.334
127	Word Ladder	Medium	21.1%	0.073
879	Profitable Schemes	Hard	32.4%	0.152

Liveramp

#	Title	Difficulty	Acceptance	Frequency
91	Decode Ways	Medium	21.0%	0.01
575	Distribute Candies	Easy	58.4%	0.168
76	Minimum Window Substring	Hard	28.2%	0.028

Lyft

#	Title	Difficulty	Acceptance	Frequency
349	Intersection of Two Arrays	Easy	49.8%	0.012
42	Trapping Rain Water	Hard	39.2%	0.132
735	Asteroid Collision	Medium	37.0%	1.401
200	Number of Islands	Medium	38.0%	0.327
126	Word Ladder II	Hard	15.7%	0.026
238	Product of Array Except Self	Medium	51.7%	0.559
146	LRU Cache	Hard	21.4%	0.009
279	Perfect Squares	Medium	38.8%	0.015
7	Reverse Integer	Easy	24.4%	0.003
20	Valid Parentheses	Easy	34.6%	0.004

Machine Zone

#	Title	Difficulty	Acceptance	Frequency
715	Range Module	Hard	31.3%	0.106

Maq Software

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.003

Mathworks

#	Title	Difficulty	Acceptance	Frequency
20	Valid Parentheses	Easy	34.6%	0.004
1	Two Sum	Easy	38.9%	0.002
138	Copy List with Random Pointer	Medium	25.6%	0.011
25	Reverse Nodes in k-Group	Hard	33.3%	0.038
526	Beautiful Arrangement	Medium	52.9%	0.068

Matlab

#	Title	Difficulty	Acceptance	Frequency
31	Next Permutation	Medium	29.3%	0.01

Microsoft

#	Title	Difficulty	Acceptance	Frequency
103	Binary Tree Zigzag Level Order Traversal	Medium	38.5%	0.207
33	Search in Rotated Sorted Array	Medium	32.1%	0.079
75	Sort Colors	Medium	40.0%	0.064
445	Add Two Numbers II	Medium	47.4%	0.052
13	Roman to Integer	Easy	49.5%	0.072
23	Merge k Sorted Lists	Hard	30.3%	0.045
695	Max Area of Island	Easy	53.1%	0.015
8	String to Integer (atoi)	Medium	14.1%	0.044
133	Clone Graph	Medium	25.1%	0.061
402	Remove K Digits	Medium	25.6%	1.172
19	Remove Nth Node From End of List	Medium	33.6%	0.015
7	Reverse Integer	Easy	24.4%	0.003
138	Copy List with Random Pointer	Medium	25.6%	0.673
1	Two Sum	Easy	38.9%	0.088
12	Integer to Roman	Medium	47.7%	0.013
43	Multiply Strings	Medium	28.7%	0.034
415	Add Strings	Easy	42.1%	0.024
5	Longest Palindromic Substring	Medium	25.6%	0.029
557	Reverse Words in a String III	Easy	61.6%	0.091
54	Spiral Matrix	Medium	28.2%	0.114
17	Letter Combinations of a Phone Number	Medium	38.2%	0.041
346	Moving Average from Data Stream	Easy	62.2%	0.051
2	Add Two Numbers	Medium	29.2%	0.212
636	Exclusive Time of Functions	Medium	45.4%	0.07
443	String Compression	Easy	35.8%	0.024
53	Maximum Subarray	Easy	41.3%	0.031
207	Course Schedule	Medium	34.9%	0.052
168	Excel Sheet Column Title	Easy	27.9%	0.083
42	Trapping Rain Water	Hard	39.2%	0.02
273	Integer to English Words	Hard	23.1%	0.074
146	LRU Cache	Hard	21.4%	0.17
277	Find the Celebrity	Medium	35.2%	0.161
122	Best Time to Buy and Sell Stock II	Easy	49.2%	0.008
253	Meeting Rooms II	Medium	40.1%	0.505
206	Reverse Linked List	Easy	49.5%	0.076
24	Swap Nodes in Pairs	Medium	40.9%	0.169
21	Merge Two Sorted Lists	Easy	43.2%	0.137
72	Edit Distance	Hard	34.2%	0.017
56	Merge Intervals	Medium	33.1%	0.007
229	Majority Element II	Medium	30.2%	0.45
283	Move Zeroes	Easy	52.4%	0.006
212	Word Search II	Hard	25.9%	0.053
88	Merge Sorted Array	Easy	33.3%	0.17
14	Longest Common Prefix	Easy	32.0%	0.006
328	Odd Even Linked List	Medium	46.4%	0.071
171	Excel Sheet Column Number	Easy	49.7%	0.037
11	Container With Most Water	Medium	38.9%	0.013
124	Binary Tree Maximum Path Sum	Hard	28.0%	0.033
46	Permutations	Medium	50.1%	0.008
200	Number of Islands	Medium	38.0%	0.071
102	Binary Tree Level Order Traversal	Medium	44.7%	0.017
15	3Sum	Medium	22.1%	0.04
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	36.7%	0.012
49	Group Anagrams	Medium	41.3%	0.071
210	Course Schedule II	Medium	31.7%	0.019
4	Median of Two Sorted Arrays	Hard	23.9%	0.056
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.019
252	Meeting Rooms	Easy	49.8%	0.026
78	Subsets	Medium	47.8%	0.008
151	Reverse Words in a String	Medium	15.7%	0.247
235	Lowest Common Ancestor of a Binary Search Tree	Easy	41.3%	0.078
236	Lowest Common Ancestor of a Binary Tree	Medium	32.0%	0.036
329	Longest Increasing Path in a Matrix	Hard	37.8%	0.03
165	Compare Version Numbers	Medium	21.6%	0.187
117	Populating Next Right Pointers in Each Node II	Medium	33.5%	0.043
20	Valid Parentheses	Easy	34.6%	0.114
722	Remove Comments	Medium	29.0%	0.05
121	Best Time to Buy and Sell Stock	Easy	44.4%	0.012
204	Count Primes	Easy	27.1%	0.028
25	Reverse Nodes in k-Group	Hard	33.3%	0.301
36	Valid Sudoku	Medium	39.5%	0.013
71	Simplify Path	Medium	27.1%	0.028
623	Add One Row to Tree	Medium	46.3%	0.124
160	Intersection of Two Linked Lists	Easy	30.7%	0.078
784	Letter Case Permutation	Easy	53.4%	0.03
10	Regular Expression Matching	Hard	24.4%	0.22
642	Design Search Autocomplete System	Hard	31.8%	0.14
234	Palindrome Linked List	Easy	34.2%	0.04
139	Word Break	Medium	32.6%	0.099
134	Gas Station	Medium	31.3%	0.051
240	Search a 2D Matrix II	Medium	39.4%	0.034
348	Design Tic-Tac-Toe	Medium	46.9%	0.446
191	Number of 1 Bits	Easy	40.9%	0.015
237	Delete Node in a Linked List	Easy	49.3%	0.011
50	Pow(x, n)	Medium	26.6%	0.009
287	Find the Duplicate Number	Medium	46.0%	0.047
242	Valid Anagram	Easy	48.9%	0.01
322	Coin Change	Medium	27.3%	0.027
785	Is Graph Bipartite?	Medium	39.9%	0.026
92	Reverse Linked List II	Medium	32.5%	0.146
66	Plus One	Easy	40.0%	0.006
186	Reverse Words in a String II	Medium	33.5%	0.076
535	Encode and Decode TinyURL	Medium	74.3%	0.025
153	Find Minimum in Rotated Sorted Array	Medium	41.6%	0.011
125	Valid Palindrome	Easy	28.5%	0.008
98	Validate Binary Search Tree	Medium	24.4%	0.025
44	Wildcard Matching	Hard	21.6%	0.043
37	Sudoku Solver	Hard	33.5%	0.033
141	Linked List Cycle	Easy	34.6%	0.015
48	Rotate Image	Medium	44.1%	0.128
280	Wiggle Sort	Medium	59.4%	0.071
297	Serialize and Deserialize Binary Tree	Hard	36.7%	0.014
106	Construct Binary Tree from Inorder and Postorder Traversal	Medium	35.8%	0.021
347	Top K Frequent Elements	Medium	51.0%	0.011
295	Find Median from Data Stream	Hard	31.7%	0.023
140	Word Break II	Hard	25.4%	0.02
285	Inorder Successor in BST	Medium	33.9%	0.024
669	Trim a Binary Search Tree	Easy	58.5%	0.09
64	Minimum Path Sum	Medium	43.0%	0.026
173	Binary Search Tree Iterator	Medium	44.6%	0.03
215	Kth Largest Element in an Array	Medium	42.9%	0.008
223	Rectangle Area	Medium	34.6%	0.105
344	Reverse String	Easy	61.5%	0.052
300	Longest Increasing Subsequence	Medium	39.3%	0.011
208	Implement Trie (Prefix Tree)	Medium	33.6%	0.092
61	Rotate List	Medium	25.4%	0.065
81	Search in Rotated Sorted Array II	Medium	32.4%	0.039
69	Sqrt(x)	Easy	29.5%	0.008
523	Continuous Subarray Sum	Medium	23.5%	0.029
189	Rotate Array	Easy	26.9%	0.035
304	Range Sum Query 2D - Immutable	Medium	28.9%	0.032
167	Two Sum II - Input array is sorted	Easy	47.6%	0.01
384	Shuffle an Array	Medium	48.1%	0.058
31	Next Permutation	Medium	29.3%	0.044
417	Pacific Atlantic Water Flow	Medium	35.3%	0.054
73	Set Matrix Zeroes	Medium	37.6%	0.032
9	Palindrome Number	Easy	38.5%	0.011
518	Coin Change 2	Medium	38.0%	0.028
836	Rectangle Overlap	Easy	43.7%	0.069
86	Partition List	Medium	34.8%	0.023
26	Remove Duplicates from Sorted Array	Easy	37.9%	0.005
227	Basic Calculator II	Medium	31.1%	0.022
683	K Empty Slots	Hard	33.4%	0.031
314	Binary Tree Vertical Order Traversal	Medium	38.7%	0.075
118	Pascal's Triangle	Easy	42.1%	0.013
85	Maximal Rectangle	Hard	30.8%	0.064
93	Restore IP Addresses	Medium	29.4%	0.059
228	Summary Ranges	Medium	33.6%	0.03
143	Reorder List	Medium	28.1%	0.022
387	First Unique Character in a String	Easy	47.6%	0.017
174	Dungeon Game	Hard	25.2%	0.052
543	Diameter of Binary Tree	Easy	45.2%	0.012
107	Binary Tree Level Order Traversal II	Easy	43.8%	0.016
394	Decode String	Medium	42.2%	0.02

Morgan Stanley

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.002
141	Linked List Cycle	Easy	34.6%	0.007
121	Best Time to Buy and Sell Stock	Easy	44.4%	0.005
268	Missing Number	Easy	46.1%	0.01

National Instruments

#	Title	Difficulty	Acceptance	Frequency
880	Decoded String at Index	Medium	22.0%	0

Netease

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.003
4	Median of Two Sorted Arrays	Hard	23.9%	0.006
72	Edit Distance	Hard	34.2%	0.016
7	Reverse Integer	Easy	24.4%	0.003

Netsuite

#	Title	Difficulty	Acceptance	Frequency
76	Minimum Window Substring	Hard	28.2%	0.01

Nutanix

#	Title	Difficulty	Acceptance	Frequency
443	String Compression	Easy	35.8%	0.024
172	Factorial Trailing Zeroes	Easy	37.0%	0.022
402	Remove K Digits	Medium	25.6%	0.026

Nvidia

#	Title	Difficulty	Acceptance	Frequency
206	Reverse Linked List	Easy	49.5%	0.005
146	LRU Cache	Hard	21.4%	0.009

Oracle

#	Title	Difficulty	Acceptance	Frequency
146	LRU Cache	Hard	21.4%	0.036
297	Serialize and Deserialize Binary Tree	Hard	36.7%	0.014
200	Number of Islands	Medium	38.0%	0.006
139	Word Break	Medium	32.6%	0.008
73	Set Matrix Zeroes	Medium	37.6%	0.032
189	Rotate Array	Easy	26.9%	0.009
127	Word Ladder	Medium	21.1%	0.027
403	Frog Jump	Hard	33.6%	0.071
362	Design Hit Counter	Medium	56.1%	0.059
173	Binary Search Tree Iterator	Medium	44.6%	0.03
253	Meeting Rooms II	Medium	40.1%	0.013
23	Merge k Sorted Lists	Hard	30.3%	0.007
14	Longest Common Prefix	Easy	32.0%	0.006
394	Decode String	Medium	42.2%	0.02
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.003

Palantir Technologies

#	Title	Difficulty	Acceptance	Frequency
56	Merge Intervals	Medium	33.1%	0.834
539	Minimum Time Difference	Medium	46.4%	0.631
393	UTF-8 Validation	Medium	34.9%	0.752

Paypal

#	Title	Difficulty	Acceptance	Frequency
206	Reverse Linked List	Easy	49.5%	0.005
151	Reverse Words in a String	Medium	15.7%	0.011
237	Delete Node in a Linked List	Easy	49.3%	0.011
23	Merge k Sorted Lists	Hard	30.3%	0.007
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.012
146	LRU Cache	Hard	21.4%	0.02
273	Integer to English Words	Hard	23.1%	0.019
139	Word Break	Medium	32.6%	0.008
15	3Sum	Medium	22.1%	0.005
25	Reverse Nodes in k-Group	Hard	33.3%	0.017

Pinterest

#	Title	Difficulty	Acceptance	Frequency
277	Find the Celebrity	Medium	35.2%	0.106
269	Alien Dictionary	Hard	27.6%	0.032
460	LFU Cache	Hard	26.2%	0.045
224	Basic Calculator	Hard	29.9%	0.152
759	Employee Free Time	Hard	54.1%	0.429
36	Valid Sudoku	Medium	39.5%	0.03
146	LRU Cache	Hard	21.4%	0.009

Pocket Gems

#	Title	Difficulty	Acceptance	Frequency
740	Delete and Earn	Medium	44.3%	0.059
133	Clone Graph	Medium	25.1%	0.035
697	Degree of an Array	Easy	47.4%	0.035

Ponyai

#	Title	Difficulty	Acceptance	Frequency
148	Sort List	Medium	31.8%	0.021

Poynt

#	Title	Difficulty	Acceptance	Frequency
655	Print Binary Tree	Medium	49.1%	0

Pure Storage

#	Title	Difficulty	Acceptance	Frequency
593	Valid Square	Medium	39.9%	0.218
150	Evaluate Reverse Polish Notation	Medium	29.8%	0.019
647	Palindromic Substrings	Medium	54.5%	0.066
203	Remove Linked List Elements	Easy	34.2%	0.2

Pure

#	Title	Difficulty	Acceptance	Frequency
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.003

Qualcomm

#	Title	Difficulty	Acceptance	Frequency
20	Valid Parentheses	Easy	34.6%	0.004

Qualtrics

#	Title	Difficulty	Acceptance	Frequency
200	Number of Islands	Medium	38.0%	0.006
98	Validate Binary Search Tree	Medium	24.4%	0.006
173	Binary Search Tree Iterator	Medium	44.6%	0.014

Quip

#	Title	Difficulty	Acceptance	Frequency
740	Delete and Earn	Medium	44.3%	0.128
855	Exam Room	Medium	31.3%	0.094

Quora

#	Title	Difficulty	Acceptance	Frequency
297	Serialize and Deserialize Binary Tree	Hard	36.7%	0.014
855	Exam Room	Medium	31.3%	0.479
2	Add Two Numbers	Medium	29.2%	0.003

Rackspace

#	Title	Difficulty	Acceptance	Frequency
473	Matchsticks to Square	Medium	35.2%	0

Radius

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.001

Redfin

#	Title	Difficulty	Acceptance	Frequency
628	Maximum Product of Three Numbers	Easy	44.8%	0.03

Riot Games

#	Title	Difficulty	Acceptance	Frequency
20	Valid Parentheses	Easy	34.6%	0.004

Roblox

#	Title	Difficulty	Acceptance	Frequency
811	Subdomain Visit Count	Easy	61.2%	0.029
224	Basic Calculator	Hard	29.9%	0.093

Rubrik

#	Title	Difficulty	Acceptance	Frequency
166	Fraction to Recurring Decimal	Medium	18.5%	0.032
31	Next Permutation	Medium	29.3%	0.011

Salesforce

#	Title	Difficulty	Acceptance	Frequency
227	Basic Calculator II	Medium	31.1%	0.022
740	Delete and Earn	Medium	44.3%	0.058
146	LRU Cache	Hard	21.4%	0.009
153	Find Minimum in Rotated Sorted Array	Medium	41.6%	0.011
213	House Robber II	Medium	34.7%	0.023
300	Longest Increasing Subsequence	Medium	39.3%	0.011
384	Shuffle an Array	Medium	48.1%	0.026

Samsung

#	Title	Difficulty	Acceptance	Frequency
312	Burst Balloons	Hard	44.5%	0.667
1	Two Sum	Easy	38.9%	0.002
20	Valid Parentheses	Easy	34.6%	0.009
33	Search in Rotated Sorted Array	Medium	32.1%	0.007
572	Subtree of Another Tree	Easy	40.3%	0.018

Sap

#	Title	Difficulty	Acceptance	Frequency
283	Move Zeroes	Easy	52.4%	0.022
12	Integer to Roman	Medium	47.7%	0.012
559	Maximum Depth of N-ary Tree	Easy	61.1%	0.015

Servicenow

#	Title	Difficulty	Acceptance	Frequency
653	Two Sum IV - Input is a BST	Easy	50.7%	0.02
151	Reverse Words in a String	Medium	15.7%	0.011
205	Isomorphic Strings	Easy	35.5%	0.013
20	Valid Parentheses	Easy	34.6%	0.004
19	Remove Nth Node From End of List	Medium	33.6%	0.007

Sina

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.005
136	Single Number	Easy	57.0%	0.005
141	Linked List Cycle	Easy	34.6%	0.005
209	Minimum Size Subarray Sum	Medium	33.2%	0.013

Snapchat

#	Title	Difficulty	Acceptance	Frequency
139	Word Break	Medium	32.6%	0.008
146	LRU Cache	Hard	21.4%	0.009
33	Search in Rotated Sorted Array	Medium	32.1%	0.007
68	Text Justification	Hard	21.0%	0.041
273	Integer to English Words	Hard	23.1%	0.019

Square

#	Title	Difficulty	Acceptance	Frequency
68	Text Justification	Hard	21.0%	0.041
17	Letter Combinations of a Phone Number	Medium	38.2%	0.007
289	Game of Life	Medium	39.6%	0.048
98	Validate Binary Search Tree	Medium	24.4%	0.006
72	Edit Distance	Hard	34.2%	0.017
415	Add Strings	Easy	42.1%	0.024
15	3Sum	Medium	22.1%	0.005

Sumologic

#	Title	Difficulty	Acceptance	Frequency
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.007
5	Longest Palindromic Substring	Medium	25.6%	0.01

Symantec

#	Title	Difficulty	Acceptance	Frequency
17	Letter Combinations of a Phone Number	Medium	38.2%	0.006

Tableau

#	Title	Difficulty	Acceptance	Frequency
2	Add Two Numbers	Medium	29.2%	0.003
236	Lowest Common Ancestor of a Binary Tree	Medium	32.0%	0.009

Tencent

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.01
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.019
21	Merge Two Sorted Lists	Easy	43.2%	0.011
141	Linked List Cycle	Easy	34.6%	0.027
343	Integer Break	Medium	46.7%	0.041
103	Binary Tree Zigzag Level Order Traversal	Medium	38.5%	0.011
235	Lowest Common Ancestor of a Binary Search Tree	Easy	41.3%	0.013
4	Median of Two Sorted Arrays	Hard	23.9%	0.025
23	Merge k Sorted Lists	Hard	30.3%	0.029
236	Lowest Common Ancestor of a Binary Tree	Medium	32.0%	0.021
215	Kth Largest Element in an Array	Medium	42.9%	0.018
9	Palindrome Number	Easy	38.5%	0.005
240	Search a 2D Matrix II	Medium	39.4%	0.034
206	Reverse Linked List	Easy	49.5%	0.005
344	Reverse String	Easy	61.5%	0.006

Tinyco

#	Title	Difficulty	Acceptance	Frequency
23	Merge k Sorted Lists	Hard	30.3%	0.006

Tripadvisor

#	Title	Difficulty	Acceptance	Frequency
98	Validate Binary Search Tree	Medium	24.4%	0.006

Triplebyte

#	Title	Difficulty	Acceptance	Frequency
712	Minimum ASCII Delete Sum for Two Strings	Medium	51.9%	0.322
230	Kth Smallest Element in a BST	Medium	47.5%	0.013

Twilio

#	Title	Difficulty	Acceptance	Frequency
20	Valid Parentheses	Easy	34.6%	0.025
146	LRU Cache	Hard	21.4%	0.036

Twitter

#	Title	Difficulty	Acceptance	Frequency
433	Minimum Genetic Mutation	Medium	35.9%	0.202
20	Valid Parentheses	Easy	34.6%	0.016
679	24 Game	Hard	39.2%	0.193
341	Flatten Nested List Iterator	Medium	44.4%	0.043
234	Palindrome Linked List	Easy	34.2%	0.01
1	Two Sum	Easy	38.9%	0.004
635	Design Log Storage System	Medium	50.0%	0.386
74	Search a 2D Matrix	Medium	34.4%	0.015
706	Design HashMap	Easy	44.4%	0.037

Two Sigma

#	Title	Difficulty	Acceptance	Frequency
146	LRU Cache	Hard	21.4%	0.036
547	Friend Circles	Medium	50.1%	1.524
206	Reverse Linked List	Easy	49.5%	0.005
1	Two Sum	Easy	38.9%	0.004
4	Median of Two Sorted Arrays	Hard	23.9%	0.006
123	Best Time to Buy and Sell Stock III	Hard	31.5%	0.023
50	Pow(x, n)	Medium	26.6%	0.009
53	Maximum Subarray	Easy	41.3%	0.044

Uber

#	Title	Difficulty	Acceptance	Frequency
49	Group Anagrams	Medium	41.3%	0.05
23	Merge k Sorted Lists	Hard	30.3%	0.016
224	Basic Calculator	Hard	29.9%	0.026
767	Reorganize String	Medium	38.8%	0.031
1	Two Sum	Easy	38.9%	0.02
341	Flatten Nested List Iterator	Medium	44.4%	0.02
305	Number of Islands II	Hard	40.2%	0.173
289	Game of Life	Medium	39.6%	0.048
22	Generate Parentheses	Medium	50.2%	0.018
652	Find Duplicate Subtrees	Medium	40.2%	0.077
253	Meeting Rooms II	Medium	40.1%	0.013
642	Design Search Autocomplete System	Hard	31.8%	0.065
636	Exclusive Time of Functions	Medium	45.4%	0.184
227	Basic Calculator II	Medium	31.1%	0.022
68	Text Justification	Hard	21.0%	0.041
55	Jump Game	Medium	30.2%	0.011
76	Minimum Window Substring	Hard	28.2%	0.012
158	Read N Characters Given Read4 II - Call multiple times	Hard	24.3%	0.038
146	LRU Cache	Hard	21.4%	0.17
200	Number of Islands	Medium	38.0%	0.259
139	Word Break	Medium	32.6%	0.099
17	Letter Combinations of a Phone Number	Medium	38.2%	0.015
36	Valid Sudoku	Medium	39.5%	0.03
207	Course Schedule	Medium	34.9%	0.013
7	Reverse Integer	Easy	24.4%	0.003
42	Trapping Rain Water	Hard	39.2%	0.009
267	Palindrome Permutation II	Medium	32.4%	0.094
79	Word Search	Medium	29.0%	0.024
353	Design Snake Game	Medium	28.1%	0.101
329	Longest Increasing Path in a Matrix	Hard	37.8%	0.03
354	Russian Doll Envelopes	Hard	32.8%	0.124
135	Candy	Hard	26.2%	0.036
56	Merge Intervals	Medium	33.1%	0.084
621	Task Scheduler	Medium	42.8%	0.018
655	Print Binary Tree	Medium	49.1%	0.083
359	Logger Rate Limiter	Easy	61.9%	0.042
166	Fraction to Recurring Decimal	Medium	18.5%	0.259
266	Palindrome Permutation	Easy	58.6%	0.048
20	Valid Parentheses	Easy	34.6%	0.004
212	Word Search II	Hard	25.9%	0.093
128	Longest Consecutive Sequence	Hard	39.4%	0.033
155	Min Stack	Easy	33.2%	0.009
53	Maximum Subarray	Easy	41.3%	0.011
37	Sudoku Solver	Hard	33.5%	0.033
103	Binary Tree Zigzag Level Order Traversal	Medium	38.5%	0.025
189	Rotate Array	Easy	26.9%	0.009
698	Partition to K Equal Sum Subsets	Medium	38.7%	0.038
126	Word Ladder II	Hard	15.7%	0.026
528	Random Pick with Weight	Medium	41.9%	0.06
535	Encode and Decode TinyURL	Medium	74.3%	0.025
226	Invert Binary Tree	Easy	55.1%	0.01

Valve

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.004

Visa

#	Title	Difficulty	Acceptance	Frequency
20	Valid Parentheses	Easy	34.6%	0.004

Vmware

#	Title	Difficulty	Acceptance	Frequency
300	Longest Increasing Subsequence	Medium	39.3%	0.011
20	Valid Parentheses	Easy	34.6%	0.004
4	Median of Two Sorted Arrays	Hard	23.9%	0.006
297	Serialize and Deserialize Binary Tree	Hard	36.7%	0.014
47	Permutations II	Medium	36.9%	0.013
92	Reverse Linked List II	Medium	32.5%	0.017
468	Validate IP Address	Medium	20.5%	0.055

Walmart Labs

#	Title	Difficulty	Acceptance	Frequency
344	Reverse String	Easy	61.5%	0.013
230	Kth Smallest Element in a BST	Medium	47.5%	0.013
214	Shortest Palindrome	Hard	25.9%	0.042
283	Move Zeroes	Easy	52.4%	0.023
198	House Robber	Easy	40.4%	0.008
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.003
4	Median of Two Sorted Arrays	Hard	23.9%	0.006
21	Merge Two Sorted Lists	Easy	43.2%	0.011
26	Remove Duplicates from Sorted Array	Easy	37.9%	0.005
46	Permutations	Medium	50.1%	0.008
70	Climbing Stairs	Easy	42.1%	0.015
206	Reverse Linked List	Easy	49.5%	0.005

Wish

#	Title	Difficulty	Acceptance	Frequency
146	LRU Cache	Hard	21.4%	0.02
42	Trapping Rain Water	Hard	39.2%	0.008
300	Longest Increasing Subsequence	Medium	39.3%	0.01

Works Applications

#	Title	Difficulty	Acceptance	Frequency
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.003
1	Two Sum	Easy	38.9%	0.006
486	Predict the Winner	Medium	45.6%	0.033

Yahoo

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.015
49	Group Anagrams	Medium	41.3%	0.008
347	Top K Frequent Elements	Medium	51.0%	0.041
146	LRU Cache	Hard	21.4%	0.009
387	First Unique Character in a String	Easy	47.6%	0.008
75	Sort Colors	Medium	40.0%	0.011
139	Word Break	Medium	32.6%	0.008
141	Linked List Cycle	Easy	34.6%	0.007

Yandex

#	Title	Difficulty	Acceptance	Frequency
206	Reverse Linked List	Easy	49.5%	0.005
20	Valid Parentheses	Easy	34.6%	0

Yatra

#	Title	Difficulty	Acceptance	Frequency
20	Valid Parentheses	Easy	34.6%	0.003

Yelp

#	Title	Difficulty	Acceptance	Frequency
200	Number of Islands	Medium	38.0%	0.006
139	Word Break	Medium	32.6%	0.008
49	Group Anagrams	Medium	41.3%	0.032
599	Minimum Index Sum of Two Lists	Easy	46.5%	0.575
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.012
273	Integer to English Words	Hard	23.1%	0.113
152	Maximum Product Subarray	Medium	27.5%	0.012
564	Find the Closest Palindrome	Hard	17.0%	0.723
10	Regular Expression Matching	Hard	24.4%	0.01
332	Reconstruct Itinerary	Medium	30.0%	0.039
56	Merge Intervals	Medium	33.1%	0.028
126	Word Ladder II	Hard	15.7%	0.026
380	Insert Delete GetRandom O(1)	Medium	40.6%	0.019
238	Product of Array Except Self	Medium	51.7%	0.021

Zappos

#	Title	Difficulty	Acceptance	Frequency
122	Best Time to Buy and Sell Stock II	Easy	49.2%	0.007
1	Two Sum	Easy	38.9%	0.006
557	Reverse Words in a String III	Easy	61.6%	0
2	Add Two Numbers	Medium	29.2%	0.006

Zenefits

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.004
56	Merge Intervals	Medium	33.1%	0.007
238	Product of Array Except Self	Medium	51.7%	0.021

Zillow

#	Title	Difficulty	Acceptance	Frequency
54	Spiral Matrix	Medium	28.2%	0.01
79	Word Search	Medium	29.0%	0.011
151	Reverse Words in a String	Medium	15.7%	0.011
139	Word Break	Medium	32.6%	0.019
236	Lowest Common Ancestor of a Binary Tree	Medium	32.0%	0.009
49	Group Anagrams	Medium	41.3%	0.008
146	LRU Cache	Hard	21.4%	0.02
43	Multiply Strings	Medium	28.7%	0.015
449	Serialize and Deserialize BST	Medium	43.4%	0.037

Zynga

#	Title	Difficulty	Acceptance	Frequency
1	Two Sum	Easy	38.9%	0.028
20	Valid Parentheses	Easy	34.6%	0.003
2	Add Two Numbers	Medium	29.2%	0.006
3	Longest Substring Without Repeating Characters	Medium	25.0%	0.011
4	Median of Two Sorted Arrays	Hard	23.9%	0.012
11	Container With Most Water	Medium	38.9%	0.005
139	Word Break	Medium	32.6%	0.007
142	Linked List Cycle II	Medium	30.0%	0.012
206	Reverse Linked List	Easy	49.5%	0.01
412	Fizz Buzz	Easy	58.0%	0.009