TikTok

#	Title	Difficulty	Frequency
3	Longest Substring Without Repeating Characters	Medium	6.14
5	Longest Palindromic Substring	Medium	7.01
23	Merge k Sorted Lists	Hard	16.90
42	Trapping Rain Water	Hard	1.23
46	Permutations	Medium	1.34
54	Spiral Matrix	Medium	3.60
55	Jump Game	Medium	1.01
56	Merge Intervals	Medium	10.03
76	Minimum Window Substring	Hard	2.02
79	Word Search	Medium	12.04
91	Decode Ways	Medium	3.12
98	Validate Binary Search Tree	Medium	1.14
101	Symmetric Tree	Easy	3.51
139	Word Break	Medium	1.30
146	LRU Cache	Medium	8.12
148	Sort List	Medium	3.72
151	Reverse Words in a String	Medium	1.10
200	Number of Islands	Medium	3.29
210	Course Schedule II	Medium	37.83
224	Basic Calculator	Hard	7.58
253	Meeting Rooms II	Medium	53.25
269	Alien Dictionary	Hard	18.49
300	Longest Increasing Subsequence	Medium	8.50
355	Design Twitter	Medium	24.45
394	Decode String	Medium	38.73
395	Longest Substring with At Least K Repeating Characters	Medium	27.78
399	Evaluate Division	Medium	14.83
490	The Maze	Medium	20.80
662	Maximum Width of Binary Tree	Medium	4.85
739	Daily Temperatures	Medium	2.20
772	Basic Calculator III	Hard	103.29
799	Champagne Tower	Medium	112.26
815	Bus Routes	Hard	81.37
856	Score of Parentheses	Medium	65.49
953	Verifying an Alien Dictionary	Easy	19.29
994	Rotting Oranges	Medium	2.41
1029	Two City Scheduling	Medium	83.98
1249	Minimum Remove to Make Valid Parentheses	Medium	53.90
1293	Shortest Path in a Grid with Obstacles Elimination	Hard	87.41
1335	Minimum Difficulty of a Job Schedule	Hard	25.45
1366	Rank Teams by Votes	Medium	28.56
2096	Step-By-Step Directions From a Binary Tree Node to Another	Medium	56.69
2115	Find All Possible Recipes from Given Supplies	Medium	52.61
2552	Count Increasing Quadruplets	Hard	55.43
2659	Make Array Empty	Hard	37.83