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DifficultyTopic63 of 63
No.ProblemDifficultyFrequency
146LRU CacheMedium
100.0%
2544Alternating Digit Sum
Math
Easy
100.0%
1909Remove One Element to Make the Array Strictly Increasing
Array
Easy
100.0%
1Two Sum
Sliding Window
Easy
87.5%
416Partition Equal Subset Sum
DP
Medium
87.5%
572Subtree of Another Tree
Tree
Easy
87.5%
727Minimum Window Subsequence
StringSliding Window
Hard
87.5%
868Binary GapEasy
87.5%
1206Design SkiplistHard
87.5%
1877Minimize Maximum Pair Sum in Array
Array
Medium
87.5%
54Spiral Matrix
Array
Medium
87.5%
5Longest Palindromic Substring
StringTree
Medium
75.0%
20Valid Parentheses
Stack/Queue
Easy
75.0%
49Group Anagrams
String
Medium
75.0%
127Word LadderHard
75.0%
200Number of Islands
GraphMath
Medium
75.0%
752Open the LockMedium
75.0%
207Course ScheduleMedium
75.0%
968Binary Tree Cameras
Tree
Hard
75.0%
473Matchsticks to SquareMedium
75.0%
981Time Based Key-Value StoreMedium
75.0%
50Pow(x, n)
Math
Medium
75.0%
73Set Matrix Zeroes
Array
Medium
75.0%
905Sort Array By Parity
Array
Easy
75.0%
56Merge IntervalsMedium
75.0%
347Top K Frequent Elements
Heap
Medium
75.0%
221Maximal SquareMedium
75.0%
493Reverse PairsHard
75.0%
3Longest Substring Without Repeating Characters
StringTree
Medium
62.5%
215Kth Largest Element in an Array
ArrayHeap
Medium
62.5%
332Reconstruct ItineraryHard
62.5%
680Valid Palindrome II
String
Easy
62.5%
994Rotting OrangesMedium
62.5%
75Sort ColorsMedium
62.5%
581Shortest Unsorted Continuous Subarray
Array
Medium
62.5%
97Interleaving String
String
Medium
62.5%
45Jump Game IIMedium
62.5%
1743Restore the Array From Adjacent Pairs
Array
Medium
62.5%
79Word SearchMedium
62.5%
153SumMedium
62.5%
394Decode String
String
Medium
62.5%
23Merge k Sorted ListsHard
50.0%
122Best Time to Buy and Sell Stock IIMedium
50.0%
1381Design a Stack With Increment Operation
Stack/Queue
Medium
50.0%
1438Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
Array
Medium
50.0%
472Concatenated WordsHard
50.0%
22Generate ParenthesesMedium
50.0%
1926Nearest Exit from Entrance in MazeMedium
50.0%
162Find Peak Element
Binary Search
Medium
50.0%
459Repeated Substring Pattern
StringTree
Easy
50.0%
286Walls and GatesMedium
50.0%
692Top K Frequent Words
Heap
Medium
50.0%
234Palindrome Linked List
StringLinked List
Easy
50.0%
133Clone Graph
Graph
Medium
50.0%
37Sudoku SolverHard
50.0%
238Product of Array Except Self
Array
Medium
50.0%
295Find Median from Data Stream
Heap
Hard
50.0%
3161Block Placement QueriesHard
50.0%
3208Alternating Groups IIMedium
50.0%
269Alien DictionaryHard
50.0%
30Substring with Concatenation of All Words
StringTree
Hard
50.0%
59Spiral Matrix II
Array
Medium
50.0%
2232Minimize Result by Adding Parentheses to ExpressionMedium
50.0%