TikTok LeetCode Questions

351 questions all-time · 34 easy · 245 medium · 72 hard

#	Problem	Difficulty	Frequency	Acceptance
1	LRU Cache	Medium	100	0.5%
2	Number of Islands	Medium	99	0.6%
3	Longest Increasing Subsequence	Medium	90	0.6%
4	Longest Substring Without Repeating Characters	Medium	88	0.4%
5	Number of Distinct Islands	Medium	87	0.6%
6	Course Schedule II	Medium	87	0.6%
7	Meeting Rooms II	Medium	87	0.5%
8	Merge Intervals	Medium	84	0.5%
9	Trapping Rain Water	Hard	84	0.7%
10	Course Schedule	Medium	84	0.5%
11	Subarray With Elements Greater Than Varying Threshold	Hard	84	0.5%
12	Text Justification	Hard	80	0.5%
13	Decode String	Medium	78	0.6%
14	Word Search	Medium	77	0.5%
15	Longest Palindromic Substring	Medium	75	0.4%
16	N-Queens	Hard	75	0.8%
17	Minimum Window Substring	Hard	75	0.5%
18	Search in Rotated Sorted Array	Medium	74	0.5%
19	3Sum	Medium	72	0.4%
20	Top K Frequent Elements	Medium	72	0.7%
21	Subarray Sum Equals K	Medium	72	0.5%
22	Sqrt(x)	Easy	71	0.4%
23	Coin Change	Medium	71	0.5%
24	Minimum Swaps to Group All 1's Together	Medium	71	0.6%
25	Spiral Matrix	Medium	70	0.6%
26	Merge k Sorted Lists	Hard	68	0.6%
27	Best Time to Buy and Sell Stock	Easy	68	0.6%
28	Longest Consecutive Sequence	Medium	68	0.5%
29	Making A Large Island	Hard	68	0.6%
30	Maximum Value at a Given Index in a Bounded Array	Medium	68	0.4%
31	Valid Parentheses	Easy	67	0.4%
32	House Robber	Medium	67	0.5%
33	Kth Largest Element in an Array	Medium	67	0.7%
34	Basic Calculator II	Medium	67	0.5%
35	Maximum Swap	Medium	67	0.5%
36	Basic Calculator III	Hard	67	0.5%
37	Longest Happy String	Medium	67	0.7%
38	Snapshot Array	Medium	67	0.4%
39	Two Sum	Easy	65	0.6%
40	Word Ladder	Hard	65	0.5%
41	Generate Parentheses	Medium	63	0.8%
42	Sort Colors	Medium	63	0.7%
43	Count the Hidden Sequences	Medium	63	0.6%
44	Longest Increasing Path in a Matrix	Hard	63	0.6%
45	Insert Delete GetRandom O(1)	Medium	63	0.6%
46	Valid Parenthesis String	Medium	63	0.4%
47	Max Area of Island	Medium	63	0.7%
48	Design HashMap	Easy	63	0.7%
49	Construct Binary Tree from Preorder and Inorder Traversal	Medium	61	0.7%
50	Add Strings	Easy	61	0.5%
51	Meeting Rooms III	Hard	61	0.5%
52	Closest Prime Numbers in Range	Medium	61	0.5%
53	Daily Temperatures	Medium	61	0.7%
54	Word Search II	Hard	61	0.4%
55	Edit Distance	Medium	59	0.6%
56	Binary Tree Maximum Path Sum	Hard	59	0.4%
57	Word Break II	Hard	59	0.6%
58	Reorder List	Medium	59	0.7%
59	Serialize and Deserialize Binary Tree	Hard	59	0.6%
60	Length of the Longest Alphabetical Continuous Substring	Medium	59	0.6%
61	Most Popular Video Creator	Medium	59	0.5%
62	Find the Score of All Prefixes of an Array	Medium	59	0.7%
63	Count Complete Subarrays in an Array	Medium	59	0.8%
64	Minimum Moves to Pick K Ones	Hard	59	0.2%
65	Incremental Memory Leak	Medium	59	0.7%
66	Minimum Operations to Make Character Frequencies Equal	Hard	59	0.3%
67	Minimum Cost Good Caption	Hard	59	0.2%
68	Lexicographically Smallest Generated String	Hard	59	0.5%
69	Combination Sum	Medium	57	0.8%
70	Climbing Stairs	Easy	57	0.5%
71	Simplify Path	Medium	57	0.5%
72	Binary Tree Right Side View	Medium	57	0.7%
73	Reverse Linked List	Easy	57	0.8%
74	Basic Calculator	Hard	57	0.5%
75	Find Median from Data Stream	Hard	57	0.5%
76	Bus Routes	Hard	57	0.5%
77	Shortest Path in a Grid with Obstacles Elimination	Hard	57	0.5%
78	Container With Most Water	Medium	54	0.6%
79	Find First and Last Position of Element in Sorted Array	Medium	54	0.5%
80	Group Anagrams	Medium	54	0.7%
81	Jump Game	Medium	54	0.4%
82	Subsets	Medium	54	0.8%
83	Word Break	Medium	54	0.5%
84	Find Peak Element	Medium	54	0.5%
85	Lowest Common Ancestor of a Binary Tree	Medium	54	0.7%
86	Sliding Window Maximum	Hard	54	0.5%
87	Longest Substring with At Least K Repeating Characters	Medium	54	0.5%
88	Pacific Atlantic Water Flow	Medium	54	0.6%
89	Asteroid Collision	Medium	54	0.5%
90	Koko Eating Bananas	Medium	54	0.5%
91	Possible Bipartition	Medium	54	0.5%
92	Rotting Oranges	Medium	54	0.6%
93	Shortest Bridge	Medium	54	0.6%
94	Design Add and Search Words Data Structure	Medium	54	0.5%
95	Regular Expression Matching	Hard	51	0.3%
96	Longest Common Prefix	Easy	51	0.5%
97	Reverse Nodes in k-Group	Hard	51	0.7%
98	Jump Game II	Medium	51	0.4%
99	Permutations	Medium	51	0.8%
100	Maximum Subarray	Medium	51	0.5%
101	Restore IP Addresses	Medium	51	0.6%
102	Minimum Size Subarray Sum	Medium	51	0.5%
103	Meeting Rooms	Easy	51	0.6%
104	Alien Dictionary	Hard	51	0.4%
105	Remove Duplicate Letters	Medium	51	0.5%
106	Evaluate Division	Medium	51	0.6%
107	Random Pick with Weight	Medium	51	0.5%
108	Subarray Sums Divisible by K	Medium	51	0.6%
109	Capacity To Ship Packages Within D Days	Medium	51	0.7%
110	Minimum Remove to Make Valid Parentheses	Medium	51	0.7%
111	Gas Station	Medium	51	0.5%
112	Greatest Common Divisor of Strings	Easy	51	0.5%
113	Longest Valid Parentheses	Hard	48	0.4%
114	Multiply Strings	Medium	48	0.4%
115	Permutations II	Medium	48	0.6%
116	Best Time to Buy and Sell Stock II	Medium	48	0.7%
117	Find Minimum in Rotated Sorted Array	Medium	48	0.5%
118	Compare Version Numbers	Medium	48	0.5%
119	Rotate Array	Medium	48	0.5%
120	Move Zeroes	Easy	48	0.6%
121	Partition Equal Subset Sum	Medium	48	0.5%
122	Design In-Memory File System	Hard	48	0.5%
123	Kth Missing Positive Number	Easy	48	0.6%
124	Find the Length of the Longest Common Prefix	Medium	48	0.6%
125	Matchsticks to Square	Medium	48	0.4%
126	Water and Jug Problem	Medium	48	0.5%
127	Brightest Position on Street	Medium	48	0.6%
128	Super Egg Drop	Hard	48	0.3%
129	Longest Mountain in Array	Medium	48	0.4%
130	Next Permutation	Medium	44	0.5%
131	Minimum Path Sum	Medium	44	0.7%
132	Binary Tree Zigzag Level Order Traversal	Medium	44	0.6%
133	Intersection of Two Linked Lists	Easy	44	0.6%
134	House Robber II	Medium	44	0.5%
135	Walls and Gates	Medium	44	0.6%
136	Remove Invalid Parentheses	Hard	44	0.5%
137	Kth Smallest Element in a Sorted Matrix	Medium	44	0.6%
138	Frog Jump	Hard	44	0.5%
139	Split Message Based on Limit	Hard	44	0.4%
140	Open the Lock	Medium	44	0.6%
141	Convert Binary Search Tree to Sorted Doubly Linked List	Medium	44	0.7%
142	Reorganize String	Medium	44	0.6%
143	Score of Parentheses	Medium	44	0.6%
144	Minimize Malware Spread	Hard	44	0.4%
145	Remove All Adjacent Duplicates in String II	Medium	44	0.6%
146	Number of Good Leaf Nodes Pairs	Medium	44	0.7%
147	Minimum Moves to Spread Stones Over Grid	Medium	44	0.5%
148	Combinations	Medium	44	0.7%
149	Find All Duplicates in an Array	Medium	44	0.8%
150	Min Cost to Connect All Points	Medium	44	0.7%
151	Reorder Routes to Make All Paths Lead to the City Zero	Medium	44	0.7%
152	Numbers At Most N Given Digit Set	Hard	44	0.5%
153	Binary Tree Longest Consecutive Sequence	Medium	44	0.5%
154	Largest Rectangle in Histogram	Hard	44	0.5%
155	Shortest Unsorted Continuous Subarray	Medium	44	0.4%
156	Minimum Operations to Write the Letter Y on a Grid	Medium	44	0.6%
157	Course Schedule IV	Medium	44	0.6%
158	Integer to Roman	Medium	39	0.7%
159	Swap Nodes in Pairs	Medium	39	0.7%
160	Combination Sum II	Medium	39	0.6%
161	Best Time to Buy and Sell Stock III	Hard	39	0.5%
162	Find All Possible Recipes from Given Supplies	Medium	39	0.6%
163	Best Time to Buy and Sell Stock IV	Hard	39	0.5%
164	Maximal Square	Medium	39	0.5%
165	Longest Substring with At Most K Distinct Characters	Medium	39	0.5%
166	Design Tic-Tac-Toe	Medium	39	0.6%
167	Search a 2D Matrix	Medium	39	0.5%
168	Insert Delete GetRandom O(1) - Duplicates allowed	Hard	39	0.4%
169	Remove K Digits	Medium	39	0.4%
170	Heaters	Medium	39	0.4%
171	Merge Operations to Turn Array Into a Palindrome	Medium	39	0.7%
172	Design Search Autocomplete System	Hard	39	0.5%
173	Stickers to Spell Word	Hard	39	0.5%
174	Best Time to Buy and Sell Stock with Transaction Fee	Medium	39	0.7%
175	Max Consecutive Ones III	Medium	39	0.7%
176	Shortest Path in Binary Matrix	Medium	39	0.5%
177	Longest Common Subsequence	Medium	39	0.6%
178	Number of Visible People in a Queue	Hard	39	0.7%
179	Maximum Points You Can Obtain from Cards	Medium	39	0.6%
180	Tree Diameter	Medium	39	0.6%
181	Maximum Product of Three Numbers	Easy	39	0.5%
182	Snakes and Ladders	Medium	39	0.5%
183	2 Keys Keyboard	Medium	39	0.6%
184	Sentence Similarity III	Medium	39	0.5%
185	Unique Paths II	Medium	39	0.4%
186	Make Costs of Paths Equal in a Binary Tree	Medium	39	0.6%
187	Minimum Cost For Tickets	Medium	39	0.7%
188	Regions Cut By Slashes	Medium	39	0.8%
189	Design Memory Allocator	Medium	39	0.5%
190	Robot Room Cleaner	Hard	39	0.8%
191	Cheapest Flights Within K Stops	Medium	39	0.4%
192	Path Sum III	Medium	39	0.5%
193	Merge Two Sorted Lists	Easy	33	0.7%
194	Insert Interval	Medium	33	0.5%
195	Remove Duplicates from Sorted Array II	Medium	33	0.6%
196	Reverse Linked List II	Medium	33	0.5%
197	Path Sum II	Medium	33	0.6%
198	Valid Palindrome	Easy	33	0.5%
199	Sort List	Medium	33	0.6%
200	Reverse Words in a String	Medium	33	0.6%
201	Maximum Product Subarray	Medium	33	0.4%
202	Longest Substring with At Most Two Distinct Characters	Medium	33	0.6%
203	Step-By-Step Directions From a Binary Tree Node to Another	Medium	33	0.6%
204	Largest Number	Medium	33	0.4%
205	Number of Islands II	Hard	33	0.4%
206	Shortest Distance from All Buildings	Hard	33	0.4%
207	Non-overlapping Intervals	Medium	33	0.6%
208	String Compression	Medium	33	0.6%
209	LFU Cache	Hard	33	0.5%
210	Coin Change II	Medium	33	0.6%
211	Contiguous Array	Medium	33	0.5%
212	Count Pairs Of Similar Strings	Easy	33	0.7%
213	Task Scheduler	Medium	33	0.6%
214	Find K Closest Elements	Medium	33	0.5%
215	Maximum Width of Binary Tree	Medium	33	0.5%
216	Valid Palindrome II	Easy	33	0.4%
217	Number of Atoms	Hard	33	0.7%
218	Is Graph Bipartite?	Medium	33	0.6%
219	Champagne Tower	Medium	33	0.6%
220	Sum of Subarray Minimums	Medium	33	0.4%
221	Minimum Increment to Make Array Unique	Medium	33	0.6%
222	Pairs of Songs With Total Durations Divisible by 60	Medium	33	0.5%
223	Search Suggestions System	Medium	33	0.7%
224	Minimum Difficulty of a Job Schedule	Hard	33	0.6%
225	Furthest Building You Can Reach	Medium	33	0.5%
226	Remove Nth Node From End of List	Medium	33	0.5%
227	Concatenated Words	Hard	33	0.5%
228	My Calendar I	Medium	33	0.6%
229	Number of Connected Components in an Undirected Graph	Medium	33	0.7%
230	Permutation in String	Medium	33	0.5%
231	Replace Words	Medium	33	0.7%
232	Candy	Hard	33	0.5%
233	Delete and Earn	Medium	33	0.6%
234	Max Stack	Hard	33	0.5%
235	House Robber III	Medium	33	0.6%
236	Time Based Key-Value Store	Medium	33	0.5%
237	Diameter of Binary Tree	Easy	33	0.7%
238	Maximum Width Ramp	Medium	33	0.6%
239	Find the Duplicate Number	Medium	33	0.6%
240	All Nodes Distance K in Binary Tree	Medium	33	0.7%
241	Best Time to Buy and Sell Stock with Cooldown	Medium	33	0.6%
242	Letter Case Permutation	Medium	33	0.8%
243	Minimum Number of Arrows to Burst Balloons	Medium	33	0.6%
244	Add Bold Tag in String	Medium	33	0.5%
245	Longest Duplicate Substring	Hard	33	0.3%
246	Roman to Integer	Easy	33	0.7%
247	Deepest Leaves Sum	Medium	33	0.9%
248	Count Number of Nice Subarrays	Medium	33	0.8%
249	Flatten Deeply Nested Array	Medium	33	0.7%
250	Merge In Between Linked Lists	Medium	33	0.8%
251	Accounts Merge	Medium	33	0.6%
252	Find All Anagrams in a String	Medium	33	0.5%
253	Product of the Last K Numbers	Medium	33	0.6%
254	Fruit Into Baskets	Medium	33	0.5%
255	Rotate Image	Medium	33	0.8%
256	Serialize and Deserialize N-ary Tree	Hard	33	0.7%
257	Add Two Numbers	Medium	24	0.5%
258	Median of Two Sorted Arrays	Hard	24	0.5%
259	Valid Sudoku	Medium	24	0.6%
260	Pow(x, n)	Medium	24	0.4%
261	Spiral Matrix II	Medium	24	0.8%
262	Unique Paths	Medium	24	0.7%
263	Plus One	Easy	24	0.5%
264	Decode Ways	Medium	24	0.4%
265	Unique Binary Search Trees	Medium	24	0.6%
266	Path Sum	Easy	24	0.6%
267	Parallel Courses III	Hard	24	0.7%
268	Happy Number	Easy	24	0.6%
269	Implement Trie (Prefix Tree)	Medium	24	0.7%
270	Search a 2D Matrix II	Medium	24	0.6%
271	3Sum Smaller	Medium	24	0.5%
272	Graph Valid Tree	Medium	24	0.5%
273	Expression Add Operators	Hard	24	0.4%
274	Rearrange String k Distance Apart	Hard	24	0.4%
275	Add Two Numbers II	Medium	24	0.6%
276	132 Pattern	Medium	24	0.3%
277	Validate IP Address	Medium	24	0.3%
278	Diagonal Traverse	Medium	24	0.7%
279	Number of Longest Increasing Subsequence	Medium	24	0.5%
280	Subarrays with K Different Integers	Hard	24	0.7%
281	Cousins in Binary Tree	Easy	24	0.6%
282	Dot Product of Two Sparse Vectors	Medium	24	0.9%
283	Minimum Swaps to Group All 1's Together II	Medium	24	0.7%
284	Valid Word Abbreviation	Easy	24	0.4%
285	Combination Sum IV	Medium	24	0.6%
286	Process Tasks Using Servers	Medium	24	0.4%
287	Maximal Score After Applying K Operations	Medium	24	0.6%
288	Find the Celebrity	Medium	24	0.5%
289	Insert into a Sorted Circular Linked List	Medium	24	0.4%
290	Minimum Number of Operations to Move All Balls to Each Box	Medium	24	0.9%
291	Copy List with Random Pointer	Medium	24	0.6%
292	The Maze II	Medium	24	0.6%
293	Top K Frequent Words	Medium	24	0.6%
294	Valid Palindrome III	Hard	24	0.5%
295	Arithmetic Slices	Medium	24	0.6%
296	Find Positive Integer Solution for a Given Equation	Medium	24	0.7%
297	Maximum Spending After Buying Items	Hard	24	0.6%
298	K-th Smallest in Lexicographical Order	Hard	24	0.5%
299	Rearranging Fruits	Hard	24	0.6%
300	Parallel Courses	Medium	24	0.6%
301	Convert Sorted Array to Binary Search Tree	Easy	24	0.8%
302	Maximum Performance of a Team	Hard	24	0.5%
303	Two Sum II - Input Array Is Sorted	Medium	24	0.7%
304	Maximum Profit in Job Scheduling	Hard	24	0.5%
305	Kth Smallest Element in a BST	Medium	24	0.8%
306	Construct String from Binary Tree	Medium	24	0.7%
307	Add Two Integers	Easy	24	0.9%
308	Put Marbles in Bags	Hard	24	0.7%
309	Remove Duplicates from Sorted List II	Medium	24	0.5%
310	Valid Mountain Array	Easy	24	0.4%
311	Human Traffic of Stadium	Hard	24	0.5%
312	Sparse Matrix Multiplication	Medium	24	0.7%
313	Event Emitter	Medium	24	0.8%
314	Minesweeper	Medium	24	0.7%
315	Valid Square	Medium	24	0.5%
316	Symmetric Tree	Easy	24	0.6%
317	Find Maximum Non-decreasing Array Length	Hard	24	0.2%
318	Range Frequency Queries	Medium	24	0.4%
319	Candy Crush	Medium	24	0.8%
320	Shortest Subarray to be Removed to Make Array Sorted	Medium	24	0.5%
321	Count the Number of Good Subarrays	Medium	24	0.7%
322	Consecutive Numbers Sum	Hard	24	0.4%
323	Recover Binary Search Tree	Medium	24	0.6%
324	Wiggle Sort	Medium	24	0.7%
325	Implement Queue using Stacks	Easy	24	0.7%
326	Next Greater Element I	Easy	24	0.8%
327	Encode and Decode Strings	Medium	24	0.5%
328	Verify Preorder Sequence in Binary Search Tree	Medium	24	0.5%
329	Number of Adjacent Elements With the Same Color	Medium	24	0.6%
330	24 Game	Hard	24	0.6%
331	Count Binary Substrings	Easy	24	0.7%
332	Maximum Size Subarray Sum Equals k	Medium	24	0.5%
333	Employee Free Time	Hard	24	0.7%
334	Minimum Operations to Make the Array Increasing	Easy	24	0.8%
335	Nth Digit	Medium	24	0.4%
336	Valid Tic-Tac-Toe State	Medium	24	0.3%
337	Robot Bounded In Circle	Medium	24	0.6%
338	Word Pattern II	Medium	24	0.5%
339	Partition to K Equal Sum Subsets	Medium	24	0.4%
340	Minimum Absolute Difference Between Elements With Constraint	Medium	24	0.4%
341	Department Top Three Salaries	Hard	24	0.6%
342	Construct Binary Tree from Inorder and Postorder Traversal	Medium	24	0.7%
343	Implement Rand10() Using Rand7()	Medium	24	0.5%
344	Flip Game II	Medium	24	0.5%
345	Lowest Common Ancestor of a Binary Tree IV	Medium	24	0.8%
346	Surrounded Regions	Medium	24	0.5%
347	Next Greater Element II	Medium	24	0.7%
348	All O`one Data Structure	Hard	24	0.4%
349	Unit Conversion II	Medium	24	0.7%
350	Maximum Number of Events That Can Be Attended	Medium	24	0.4%
351	Maximum Sum Circular Subarray	Medium	24	0.5%

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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