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DifficultyTopic15 of 15
No.ProblemDifficultyFrequency
2060Check if an Original String Exists Given Two Encoded Strings
String
Hard
100.0%
200Number of Islands
GraphMath
Medium
87.5%
134Gas StationMedium
87.5%
146LRU CacheMedium
87.5%
815Bus RoutesHard
75.0%
5Longest Palindromic Substring
StringTree
Medium
75.0%
340Longest Substring with At Most K Distinct Characters
StringTree
Medium
62.5%
42Trapping Rain WaterHard
62.5%
236Lowest Common Ancestor of a Binary Tree
Tree
Medium
62.5%
560Subarray Sum Equals K
Array
Medium
62.5%
84Largest Rectangle in HistogramHard
62.5%
207Course ScheduleMedium
62.5%
3Longest Substring Without Repeating Characters
StringTree
Medium
62.5%
987Vertical Order Traversal of a Binary Tree
Tree
Hard
62.5%
128Longest Consecutive SequenceMedium
62.5%