Snowflake LeetCode Questions

100 questions all-time · 13 easy · 67 medium · 20 hard

#	Problem	Difficulty	Frequency	Acceptance
1	Happy Number	Easy	100	0.6%
2	Course Schedule II	Medium	96	0.6%
3	Design In-Memory File System	Hard	93	0.5%
4	Parallel Courses III	Hard	93	0.7%
5	Minimum Window Substring	Hard	91	0.5%
6	Word Search II	Hard	90	0.4%
7	Trapping Rain Water	Hard	86	0.7%
8	Painting the Walls	Hard	85	0.5%
9	Throne Inheritance	Medium	84	0.7%
10	Calculate Amount Paid in Taxes	Easy	82	0.7%
11	Step-By-Step Directions From a Binary Tree Node to Another	Medium	82	0.6%
12	Maximum Number of Upgradable Servers	Medium	81	0.4%
13	Find All Anagrams in a String	Medium	81	0.5%
14	Maximum Profit in Job Scheduling	Hard	79	0.5%
15	Count Vowel Substrings of a String	Easy	77	0.7%
16	Minimum Array Length After Pair Removals	Medium	75	0.3%
17	Find the Maximum Length of a Good Subsequence I	Medium	75	0.3%
18	String Transformation	Hard	75	0.3%
19	Find the Maximum Length of a Good Subsequence II	Hard	73	0.3%
20	Number of Ways to Form a Target String Given a Dictionary	Hard	71	0.6%
21	Merge k Sorted Lists	Hard	71	0.6%
22	Course Schedule	Medium	68	0.5%
23	Parallel Courses	Medium	68	0.6%
24	Minimum Absolute Difference Between Two Values	Easy	68	0.7%
25	Design HashMap	Easy	65	0.7%
26	Max Area of Island	Medium	65	0.7%
27	Two Sum	Easy	65	0.6%
28	Boundary of Binary Tree	Medium	62	0.5%
29	Basic Calculator	Hard	62	0.5%
30	Maximum Number of Events That Can Be Attended	Medium	62	0.4%
31	Simplify Path	Medium	62	0.5%
32	Top K Frequent Elements	Medium	62	0.7%
33	Shortest Word Distance	Easy	62	0.7%
34	Merge Two Sorted Lists	Easy	58	0.7%
35	Time Based Key-Value Store	Medium	58	0.5%
36	LRU Cache	Medium	58	0.5%
37	Design Hit Counter	Medium	58	0.7%
38	Task Scheduler	Medium	58	0.6%
39	Copy List with Random Pointer	Medium	58	0.6%
40	Maximize Distance to Closest Person	Medium	58	0.5%
41	Design Add and Search Words Data Structure	Medium	58	0.5%
42	Remove Sub-Folders from the Filesystem	Medium	58	0.8%
43	Web Crawler Multithreaded	Medium	58	0.5%
44	Web Crawler	Medium	58	0.7%
45	Regular Expression Matching	Hard	53	0.3%
46	Insert Delete GetRandom O(1)	Medium	53	0.6%
47	Min Stack	Medium	53	0.6%
48	Snapshot Array	Medium	53	0.4%
49	Single Element in a Sorted Array	Medium	53	0.6%
50	Keys and Rooms	Medium	53	0.8%
51	Maximum Number of Events That Can Be Attended II	Hard	53	0.6%
52	Design Log Storage System	Medium	53	0.6%
53	Populating Next Right Pointers in Each Node	Medium	46	0.7%
54	Integer to English Words	Hard	46	0.4%
55	Cheapest Flights Within K Stops	Medium	46	0.4%
56	Leaf-Similar Trees	Easy	46	0.7%
57	Random Pick with Weight	Medium	46	0.5%
58	Longest Univalue Path	Medium	46	0.4%
59	Roman to Integer	Easy	46	0.7%
60	Making A Large Island	Hard	46	0.6%
61	Reverse Only Letters	Easy	46	0.7%
62	Most Stones Removed with Same Row or Column	Medium	46	0.6%
63	Rotting Oranges	Medium	46	0.6%
64	Parallel Courses II	Hard	46	0.3%
65	Campus Bikes	Medium	46	0.6%
66	Graph Valid Tree	Medium	46	0.5%
67	Design Circular Deque	Medium	46	0.6%
68	Most Frequent IDs	Medium	46	0.4%
69	Populating Next Right Pointers in Each Node II	Medium	37	0.6%
70	Basic Calculator II	Medium	37	0.5%
71	Meeting Rooms II	Medium	37	0.5%
72	Encode and Decode Strings	Medium	37	0.5%
73	Maximum Number of Removable Characters	Medium	37	0.5%
74	Count Nodes Equal to Average of Subtree	Medium	37	0.9%
75	Container With Most Water	Medium	37	0.6%
76	Find Median from Data Stream	Hard	37	0.5%
77	Construct Binary Tree from Preorder and Inorder Traversal	Medium	37	0.7%
78	Most Profitable Path in a Tree	Medium	37	0.7%
79	N-Queens II	Hard	37	0.8%
80	Valid Word Abbreviation	Easy	37	0.4%
81	Implement Trie (Prefix Tree)	Medium	37	0.7%
82	Walls and Gates	Medium	37	0.6%
83	Path With Minimum Effort	Medium	37	0.6%
84	Remove K Digits	Medium	37	0.4%
85	Best Time to Buy and Sell Stock	Easy	37	0.6%
86	Non-overlapping Intervals	Medium	37	0.6%
87	Boats to Save People	Medium	37	0.6%
88	Word Search	Medium	37	0.5%
89	My Calendar I	Medium	37	0.6%
90	Alert Using Same Key-Card Three or More Times in a One Hour Period	Medium	37	0.5%
91	Design Circular Queue	Medium	37	0.5%
92	Design File System	Medium	37	0.7%
93	Paint Fence	Medium	37	0.5%
94	Add Two Numbers	Medium	37	0.5%
95	Jump Game II	Medium	37	0.4%
96	The Maze	Medium	37	0.6%
97	Height of Binary Tree After Subtree Removal Queries	Hard	37	0.5%
98	Design Browser History	Medium	37	0.8%
99	Number of Islands	Medium	37	0.6%
100	Possible Bipartition	Medium	37	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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