Uber LeetCode Questions

362 questions all-time · 45 easy · 215 medium · 102 hard

#	Problem	Difficulty	Frequency	Acceptance
1	Bus Routes	Hard	100	0.5%
2	Alien Dictionary	Hard	94	0.4%
3	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Medium	94	0.6%
4	Number of Islands	Medium	90	0.6%
5	Number of Islands II	Hard	88	0.4%
6	Squares of a Sorted Array	Easy	86	0.7%
7	Construct Quad Tree	Medium	85	0.8%
8	Kth Smallest Element in a BST	Medium	82	0.8%
9	First Unique Number	Medium	81	0.6%
10	Find the Closest Palindrome	Hard	81	0.3%
11	Word Search	Medium	77	0.5%
12	LRU Cache	Medium	77	0.5%
13	Insert Delete GetRandom O(1)	Medium	77	0.6%
14	Design Hit Counter	Medium	76	0.7%
15	Word Search II	Hard	74	0.4%
16	Minimum Edge Reversals So Every Node Is Reachable	Hard	74	0.6%
17	Best Time to Buy and Sell Stock	Easy	72	0.6%
18	My Calendar I	Medium	71	0.6%
19	Product of Array Except Self	Medium	70	0.7%
20	Evaluate Division	Medium	70	0.6%
21	Random Pick with Weight	Medium	70	0.5%
22	Count Paths That Can Form a Palindrome in a Tree	Hard	70	0.5%
23	Text Justification	Hard	69	0.5%
24	Leftmost Column with at Least a One	Medium	69	0.6%
25	Block Placement Queries	Hard	68	0.4%
26	Course Schedule II	Medium	66	0.6%
27	Valid Sudoku	Medium	65	0.6%
28	Spiral Matrix	Medium	65	0.6%
29	Making A Large Island	Hard	65	0.6%
30	Course Schedule	Medium	64	0.5%
31	Find Minimum Time to Reach Last Room I	Medium	64	0.6%
32	Letter Combinations of a Phone Number	Medium	63	0.7%
33	Group Anagrams	Medium	63	0.7%
34	Basic Calculator	Hard	63	0.5%
35	Top K Frequent Words	Medium	63	0.6%
36	Shortest Bridge	Medium	63	0.6%
37	Word Break	Medium	62	0.5%
38	Meeting Rooms II	Medium	62	0.5%
39	Design In-Memory File System	Hard	62	0.5%
40	Final Prices With a Special Discount in a Shop	Easy	62	0.8%
41	Shuffle an Array	Medium	60	0.6%
42	The Earliest Moment When Everyone Become Friends	Medium	60	0.7%
43	Two Sum	Easy	59	0.6%
44	Serialize and Deserialize Binary Tree	Hard	59	0.6%
45	Escape the Spreading Fire	Hard	59	0.4%
46	Split Message Based on Limit	Hard	59	0.4%
47	Rotating the Box	Medium	59	0.8%
48	Merge k Sorted Lists	Hard	58	0.6%
49	Search in Rotated Sorted Array	Medium	58	0.5%
50	Minimum Window Substring	Hard	58	0.5%
51	Valid Anagram	Easy	58	0.7%
52	Top K Frequent Elements	Medium	58	0.7%
53	Cherry Pickup	Hard	58	0.4%
54	Minimum Number of Operations to Make Array Continuous	Hard	58	0.5%
55	Roman to Integer	Easy	56	0.7%
56	All O`one Data Structure	Hard	56	0.4%
57	The Maze	Medium	56	0.6%
58	Minimum Time to Complete Trips	Medium	56	0.4%
59	Divide Nodes Into the Maximum Number of Groups	Hard	56	0.7%
60	Sudoku Solver	Hard	54	0.7%
61	Decode Ways	Medium	54	0.4%
62	House Robber III	Medium	54	0.6%
63	Delete Node in a BST	Medium	54	0.5%
64	Exclusive Time of Functions	Medium	54	0.7%
65	Replace Words	Medium	54	0.7%
66	Asteroid Collision	Medium	54	0.5%
67	Koko Eating Bananas	Medium	54	0.5%
68	Time Based Key-Value Store	Medium	54	0.5%
69	Minimum Operations to Reduce an Integer to 0	Medium	54	0.6%
70	String to Integer (atoi)	Medium	53	0.2%
71	Regular Expression Matching	Hard	53	0.3%
72	Combination Sum	Medium	53	0.8%
73	Subsets	Medium	53	0.8%
74	Valid Palindrome	Easy	53	0.5%
75	Min Stack	Medium	53	0.6%
76	Find Peak Element	Medium	53	0.5%
77	Excel Sheet Column Number	Easy	53	0.7%
78	Trips and Users	Hard	53	0.4%
79	Coin Change	Medium	53	0.5%
80	Find K Pairs with Smallest Sums	Medium	53	0.4%
81	Split Array Largest Sum	Hard	53	0.6%
82	Encode and Decode TinyURL	Medium	53	0.9%
83	Regions Cut By Slashes	Medium	53	0.8%
84	Rotting Oranges	Medium	53	0.6%
85	Merge Strings Alternately	Easy	53	0.8%
86	Maximum Subarray Min-Product	Medium	53	0.4%
87	Meeting Rooms III	Hard	53	0.5%
88	Check if a String Is an Acronym of Words	Easy	53	0.8%
89	Points That Intersect With Cars	Easy	53	0.7%
90	Minimum Operations to Write the Letter Y on a Grid	Medium	53	0.6%
91	Maximize Amount After Two Days of Conversions	Medium	53	0.6%
92	Maximum Coin Collection	Medium	53	0.5%
93	The Maze II	Medium	53	0.6%
94	Generate Parentheses	Medium	51	0.8%
95	Swap Nodes in Pairs	Medium	51	0.7%
96	Maximum Depth of Binary Tree	Easy	51	0.8%
97	Clone Graph	Medium	51	0.7%
98	Copy List with Random Pointer	Medium	51	0.6%
99	Word Break II	Hard	51	0.6%
100	One Edit Distance	Medium	51	0.3%
101	Reverse Words in a String II	Medium	51	0.6%
102	Happy Number	Easy	51	0.6%
103	Reverse Linked List	Easy	51	0.8%
104	Implement Trie (Prefix Tree)	Medium	51	0.7%
105	Group Shifted Strings	Medium	51	0.7%
106	Factor Combinations	Medium	51	0.5%
107	Palindrome Permutation	Easy	51	0.7%
108	Word Pattern	Easy	51	0.4%
109	Word Pattern II	Medium	51	0.5%
110	Optimal Account Balancing	Hard	51	0.5%
111	Longest Palindromic Subsequence	Medium	51	0.7%
112	Employee Importance	Medium	51	0.7%
113	Falling Squares	Hard	51	0.5%
114	Flood Fill	Easy	51	0.7%
115	Random Pick with Blacklist	Hard	51	0.4%
116	Fixed Point	Easy	51	0.6%
117	Parallel Courses	Medium	51	0.6%
118	Minimum Score Triangulation of Polygon	Medium	51	0.7%
119	Remove Zero Sum Consecutive Nodes from Linked List	Medium	51	0.5%
120	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Medium	51	0.7%
121	Find the Distance Value Between Two Arrays	Easy	51	0.7%
122	Construct K Palindrome Strings	Medium	51	0.7%
123	Course Schedule IV	Medium	51	0.6%
124	Number of Nodes in the Sub-Tree With the Same Label	Medium	51	0.6%
125	Remove Max Number of Edges to Keep Graph Fully Traversable	Hard	51	0.7%
126	Hopper Company Queries I	Hard	51	0.5%
127	Hopper Company Queries II	Hard	51	0.4%
128	Hopper Company Queries III	Hard	51	0.7%
129	Number Of Ways To Reconstruct A Tree	Hard	51	0.5%
130	Maximum Number of Eaten Apples	Medium	51	0.4%
131	Maximum XOR for Each Query	Medium	51	0.8%
132	Minimum Absolute Sum Difference	Medium	51	0.3%
133	Nearest Exit from Entrance in Maze	Medium	51	0.5%
134	Check for Contradictions in Equations	Hard	51	0.4%
135	Array With Elements Not Equal to Average of Neighbors	Medium	51	0.5%
136	Check If String Is a Prefix of Array	Easy	51	0.5%
137	Number of Strings That Appear as Substrings in Word	Easy	51	0.8%
138	Create Binary Tree From Descriptions	Medium	51	0.8%
139	Intersection of Multiple Arrays	Easy	51	0.7%
140	K Divisible Elements Subarrays	Medium	51	0.6%
141	Calculate Digit Sum of a String	Easy	51	0.7%
142	Minimum Sum of Squared Difference	Medium	51	0.3%
143	Number of People That Can Be Seen in a Grid	Medium	51	0.5%
144	Count Subarrays With Fixed Bounds	Hard	51	0.7%
145	Maximize Win From Two Segments	Medium	51	0.4%
146	Number of Ways to Reach Destination in the Grid	Hard	51	0.6%
147	Find Pattern in Infinite Stream I	Medium	51	0.6%
148	Find Pattern in Infinite Stream II	Hard	51	0.7%
149	Maximum Increasing Triplet Value	Medium	51	0.4%
150	Match Alphanumerical Pattern in Matrix I	Medium	51	0.7%
151	Minimum Operations to Make Binary Array Elements Equal to One I	Medium	51	0.8%
152	Minimum Operations to Make Binary Array Elements Equal to One II	Medium	51	0.7%
153	Find the Number of Ways to Place People II	Hard	51	0.6%
154	Find Minimum Time to Reach Last Room II	Medium	51	0.7%
155	Binary Tree Right Side View	Medium	49	0.7%
156	Open the Lock	Medium	49	0.6%
157	Number of Black Blocks	Medium	49	0.4%
158	Minimum Cost to Equalize Arrays Using Swaps	Medium	49	0.5%
159	Merge Intervals	Medium	46	0.5%
160	Largest Rectangle in Histogram	Hard	46	0.5%
161	Word Ladder	Hard	46	0.5%
162	Sliding Window Maximum	Hard	46	0.5%
163	Find Median from Data Stream	Hard	46	0.5%
164	Best Time to Buy and Sell Stock using Strategy	Medium	46	0.6%
165	Rotate Image	Medium	43	0.8%
166	Dungeon Game	Hard	43	0.4%
167	Find All Possible Recipes from Given Supplies	Medium	43	0.6%
168	Subarray Sums Divisible by K	Medium	43	0.6%
169	Boundary of Binary Tree	Medium	43	0.5%
170	Longest Path With Different Adjacent Characters	Hard	43	0.5%
171	Minimum Cost to Make at Least One Valid Path in a Grid	Hard	43	0.7%
172	Trapping Rain Water	Hard	40	0.7%
173	Insert Interval	Medium	40	0.5%
174	Longest Consecutive Sequence	Medium	40	0.5%
175	Candy	Hard	40	0.5%
176	House Robber	Medium	40	0.5%
177	Number of Matching Subsequences	Medium	40	0.5%
178	Verifying an Alien Dictionary	Easy	40	0.6%
179	Minimum Cost For Tickets	Medium	40	0.7%
180	Collect Coins in a Tree	Hard	40	0.4%
181	Design Memory Allocator	Medium	40	0.5%
182	Basic Calculator II	Medium	40	0.5%
183	Longest Palindromic Substring	Medium	37	0.4%
184	Find First and Last Position of Element in Sorted Array	Medium	37	0.5%
185	Binary Tree Maximum Path Sum	Hard	37	0.4%
186	The Skyline Problem	Hard	37	0.5%
187	Longest Increasing Path in a Matrix	Hard	37	0.6%
188	Reconstruct Itinerary	Hard	37	0.4%
189	LFU Cache	Hard	37	0.5%
190	Task Scheduler	Medium	37	0.6%
191	Sliding Puzzle	Hard	37	0.7%
192	Min Cost to Connect All Points	Medium	37	0.7%
193	Most Profitable Path in a Tree	Medium	37	0.7%
194	Brightest Position on Street	Medium	37	0.6%
195	Number of Adjacent Elements With the Same Color	Medium	37	0.6%
196	Number of Provinces	Medium	37	0.7%
197	24 Game	Hard	37	0.6%
198	Maximum Points You Can Obtain from Cards	Medium	37	0.6%
199	Burst Balloons	Hard	37	0.6%
200	Maximum Number of Points From Grid Queries	Hard	37	0.6%
201	Longest Common Prefix	Easy	32	0.5%
202	Next Permutation	Medium	32	0.5%
203	Longest Valid Parentheses	Hard	32	0.4%
204	Permutations	Medium	32	0.8%
205	Maximum Subarray	Medium	32	0.5%
206	Minimum Path Sum	Medium	32	0.7%
207	Find Minimum in Rotated Sorted Array	Medium	32	0.5%
208	Shortest Palindrome	Hard	32	0.4%
209	Move Zeroes	Easy	32	0.6%
210	Walls and Gates	Medium	32	0.6%
211	Subarray Sum Equals K	Medium	32	0.5%
212	Is Graph Bipartite?	Medium	32	0.6%
213	Cheapest Flights Within K Stops	Medium	32	0.4%
214	Exam Room	Medium	32	0.4%
215	Interval List Intersections	Medium	32	0.7%
216	Subarrays with K Different Integers	Hard	32	0.7%
217	Count Nice Pairs in an Array	Medium	32	0.5%
218	Maximum Earnings From Taxi	Medium	32	0.5%
219	Number of Flowers in Full Bloom	Hard	32	0.6%
220	Find the Length of the Longest Common Prefix	Medium	32	0.6%
221	Smallest String With Swaps	Medium	32	0.6%
222	Word Ladder II	Hard	32	0.3%
223	Add Digits	Easy	32	0.7%
224	Design File System	Medium	32	0.7%
225	Water and Jug Problem	Medium	32	0.5%
226	Rotated Digits	Medium	32	0.6%
227	Detonate the Maximum Bombs	Medium	32	0.5%
228	Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree	Hard	32	0.7%
229	Replace Non-Coprime Numbers in Array	Hard	32	0.6%
230	Maximum Profit in Job Scheduling	Hard	32	0.5%
231	Shortest Path to Get All Keys	Hard	32	0.5%
232	Maximum Number of Alloys	Medium	32	0.4%
233	Median of Two Sorted Arrays	Hard	27	0.5%
234	Reverse Integer	Medium	27	0.3%
235	Valid Parentheses	Easy	27	0.4%
236	Remove Element	Easy	27	0.6%
237	Sqrt(x)	Easy	27	0.4%
238	Longest Repeating Character Replacement	Medium	27	0.6%
239	Find Eventual Safe States	Medium	27	0.7%
240	Capacity To Ship Packages Within D Days	Medium	27	0.7%
241	Analyze User Website Visit Pattern	Medium	27	0.4%
242	Minimum Number of Taps to Open to Water a Garden	Hard	27	0.5%
243	Design Parking System	Easy	27	0.9%
244	Furthest Building You Can Reach	Medium	27	0.5%
245	Frequency of the Most Frequent Element	Medium	27	0.4%
246	Count the Number of Good Subarrays	Medium	27	0.7%
247	Put Marbles in Bags	Hard	27	0.7%
248	Minimum Absolute Difference Between Elements With Constraint	Medium	27	0.4%
249	Find the Most Competitive Subsequence	Medium	27	0.5%
250	Design Browser History	Medium	27	0.8%
251	Design Search Autocomplete System	Hard	27	0.5%
252	Meeting Scheduler	Medium	27	0.6%
253	Maximum Frequency Stack	Hard	27	0.7%
254	Design a Text Editor	Hard	27	0.5%
255	Remove Comments	Medium	27	0.4%
256	Surrounded Regions	Medium	27	0.5%
257	Number of Subarrays That Match a Pattern I	Medium	27	0.7%
258	Cache With Time Limit	Medium	27	0.8%
259	Add Strings	Easy	27	0.5%
260	Largest 1-Bordered Square	Medium	27	0.5%
261	Graph Connectivity With Threshold	Hard	27	0.5%
262	Simplify Path	Medium	27	0.5%
263	Shortest Path in Binary Matrix	Medium	27	0.5%
264	Random Point in Non-overlapping Rectangles	Medium	27	0.4%
265	Maximum Number of Events That Can Be Attended	Medium	27	0.4%
266	Count Primes	Medium	27	0.4%
267	IPO	Hard	27	0.5%
268	Design A Leaderboard	Medium	27	0.7%
269	Minimum Jumps to Reach End via Prime Teleportation	Medium	27	0.4%
270	Minimum Knight Moves	Medium	27	0.4%
271	Count the Number of Infection Sequences	Hard	27	0.4%
272	Binary Searchable Numbers in an Unsorted Array	Medium	27	0.6%
273	Add Two Numbers	Medium	19	0.5%
274	Longest Substring Without Repeating Characters	Medium	19	0.4%
275	Container With Most Water	Medium	19	0.6%
276	Remove Duplicates from Sorted Array	Easy	19	0.6%
277	Climbing Stairs	Easy	19	0.5%
278	Set Matrix Zeroes	Medium	19	0.6%
279	Kth Largest Element in an Array	Medium	19	0.7%
280	Search a 2D Matrix II	Medium	19	0.6%
281	Longest Increasing Subsequence	Medium	19	0.6%
282	Patching Array	Hard	19	0.5%
283	Matchsticks to Square	Medium	19	0.4%
284	Predict the Winner	Medium	19	0.6%
285	Next Greater Element I	Easy	19	0.8%
286	Freedom Trail	Hard	19	0.6%
287	01 Matrix	Medium	19	0.5%
288	Find K Closest Elements	Medium	19	0.5%
289	Candy Crush	Medium	19	0.8%
290	Swim in Rising Water	Hard	19	0.7%
291	Possible Bipartition	Medium	19	0.5%
292	Stone Game II	Medium	19	0.7%
293	Simple Bank System	Medium	19	0.7%
294	Time Needed to Buy Tickets	Easy	19	0.7%
295	Amount of New Area Painted Each Day	Hard	19	0.6%
296	Amount of Time for Binary Tree to Be Infected	Medium	19	0.7%
297	House Robber II	Medium	19	0.5%
298	Paint House	Medium	19	0.6%
299	Get Biggest Three Rhombus Sums in a Grid	Medium	19	0.7%
300	Meeting Rooms	Easy	19	0.6%
301	Find the Celebrity	Medium	19	0.5%
302	Count Different Palindromic Subsequences	Hard	19	0.5%
303	Spiral Matrix III	Medium	19	0.8%
304	Minimize Malware Spread	Hard	19	0.4%
305	Minimize Malware Spread II	Hard	19	0.5%
306	Count Palindromic Subsequences	Hard	19	0.4%
307	Count Prefix and Suffix Pairs II	Hard	19	0.3%
308	Number of Distinct Substrings in a String	Medium	19	0.6%
309	Promise Pool	Medium	19	0.8%
310	Maximum Manhattan Distance After K Changes	Medium	19	0.5%
311	Shortest Path in a Grid with Obstacles Elimination	Hard	19	0.5%
312	Valid Palindrome II	Easy	19	0.4%
313	Maximize Sum Of Array After K Negations	Easy	19	0.5%
314	Number of Subarrays with Bounded Maximum	Medium	19	0.6%
315	Design Snake Game	Medium	19	0.4%
316	Reverse Nodes in k-Group	Hard	19	0.7%
317	Find the Maximum Length of Valid Subsequence II	Medium	19	0.6%
318	Integer Replacement	Medium	19	0.4%
319	2 Keys Keyboard	Medium	19	0.6%
320	Binary Tree Longest Consecutive Sequence II	Medium	19	0.5%
321	Maximum Average Subarray I	Easy	19	0.5%
322	Ones and Zeroes	Medium	19	0.5%
323	Count Integers in Intervals	Hard	19	0.4%
324	Human Traffic of Stadium	Hard	19	0.5%
325	Repeated String Match	Medium	19	0.4%
326	Insert Delete GetRandom O(1) - Duplicates allowed	Hard	19	0.4%
327	Find the Safest Path in a Grid	Medium	19	0.5%
328	Closest Binary Search Tree Value	Easy	19	0.5%
329	Accounts Merge	Medium	19	0.6%
330	Minimum Difference in Sums After Removal of Elements	Hard	19	0.7%
331	Linked List Components	Medium	19	0.6%
332	Count Binary Substrings	Easy	19	0.7%
333	Bomb Enemy	Medium	19	0.5%
334	Find All People With Secret	Hard	19	0.5%
335	Magnetic Force Between Two Balls	Medium	19	0.7%
336	Rearranging Fruits	Hard	19	0.6%
337	Process Restricted Friend Requests	Hard	19	0.6%
338	Longest Subsequence With Limited Sum	Easy	19	0.7%
339	Vertical Order Traversal of a Binary Tree	Hard	19	0.5%
340	Checking Existence of Edge Length Limited Paths	Hard	19	0.6%
341	Find K-th Smallest Pair Distance	Hard	19	0.5%
342	Shortest Distance from All Buildings	Hard	19	0.4%
343	Painting a Grid With Three Different Colors	Hard	19	0.8%
344	Find All Anagrams in a String	Medium	19	0.5%
345	Minimize the Maximum Edge Weight of Graph	Medium	19	0.4%
346	Fizz Buzz	Easy	19	0.8%
347	Find a Peak Element II	Medium	19	0.6%
348	Next Greater Element II	Medium	19	0.7%
349	Graph Valid Tree	Medium	19	0.5%
350	Populating Next Right Pointers in Each Node II	Medium	19	0.6%
351	Minimum Fuel Cost to Report to the Capital	Medium	19	0.7%
352	Number of Ways to Form a Target String Given a Dictionary	Hard	19	0.6%
353	Search a 2D Matrix	Medium	19	0.5%
354	Search Suggestions System	Medium	19	0.7%
355	Zero Array Transformation II	Medium	19	0.4%
356	Remove Sub-Folders from the Filesystem	Medium	19	0.8%
357	Goat Latin	Easy	19	0.7%
358	Make Lexicographically Smallest Array by Swapping Elements	Medium	19	0.6%
359	Number of Wonderful Substrings	Medium	19	0.7%
360	Minimum Number of Refueling Stops	Hard	19	0.4%
361	Sort Colors	Medium	19	0.7%
362	Design Twitter	Medium	19	0.4%

How to read this list

The tabs at the top split the questions by how recently people said they were asked in interviews. "Last 30 Days" is the past month, "Last 3 Months" is the past quarter, and so on. "All Time" is every question on record for this company.

Frequency is a score from 0 to 100 for how often a question showed up in that time window. A higher number means it came up more often, so the list starts with the most common questions first. Acceptance is the share of submissions that pass on LeetCode. Click any question to open it on LeetCode.

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