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