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DifficultyTopic16 of 16
No.ProblemDifficultyFrequency
1381Design a Stack With Increment Operation
Stack/Queue
Medium
100.0%
1048Longest String Chain
String
Medium
100.0%
200Number of Islands
GraphMath
Medium
100.0%
146LRU CacheMedium
87.5%
42Trapping Rain WaterHard
75.0%
540Single Element in a Sorted Array
Array
Medium
75.0%
1438Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
Array
Medium
75.0%
827Making A Large Island
Graph
Hard
75.0%
130Surrounded RegionsMedium
75.0%
2116Check if a Parentheses String Can Be Valid
String
Medium
75.0%
210Course Schedule IIMedium
75.0%
394Decode String
String
Medium
75.0%
76Minimum Window Substring
StringTreeSliding Window
Hard
75.0%
305Number of Islands II
GraphMath
Hard
75.0%
994Rotting OrangesMedium
75.0%
23Merge k Sorted ListsHard
75.0%