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DifficultyTopic64 of 64
No.ProblemDifficultyFrequency
20Valid Parentheses
Stack/Queue
Easy
100.0%
3148Maximum Difference Score in a GridMedium
87.5%
2467Most Profitable Path in a Tree
Tree
Medium
87.5%
628Maximum Product of Three Numbers
Math
Easy
87.5%
2915Length of the Longest Subsequence That Sums to Target
String
Medium
75.0%
994Rotting OrangesMedium
75.0%
139Word BreakMedium
75.0%
146LRU CacheMedium
75.0%
2234Maximum Total Beauty of the GardensHard
75.0%
3088Make String Anti-palindrome
String
Hard
75.0%
322Coin Change
DP
Medium
75.0%
2453Destroy Sequential TargetsMedium
75.0%
2489Number of Substrings With Fixed Ratio
StringTreeMath
Medium
75.0%
695Max Area of Island
Graph
Medium
75.0%
770Basic Calculator IVHard
75.0%
1698Number of Distinct Substrings in a String
StringTreeMath
Medium
75.0%
66Plus OneEasy
75.0%
3619Count Islands With Total Value Divisible by K
Graph
Medium
75.0%
1Two Sum
Sliding Window
Easy
62.5%
210Course Schedule IIMedium
62.5%
359Logger Rate LimiterEasy
62.5%
1411Number of Ways to Paint N × 3 Grid
Math
Hard
62.5%
493Reverse PairsHard
62.5%
664Strange PrinterHard
62.5%
22Generate ParenthesesMedium
50.0%
37Sudoku SolverHard
50.0%
49Group Anagrams
String
Medium
50.0%
198House RobberMedium
50.0%
929Unique Email AddressesEasy
50.0%
354Russian Doll EnvelopesHard
50.0%
32Longest Valid Parentheses
Stack/Queue
Hard
50.0%
739Daily TemperaturesMedium
50.0%
125Valid Palindrome
String
Easy
50.0%
56Merge IntervalsMedium
50.0%
1931Painting a Grid With Three Different ColorsHard
50.0%
647Palindromic Substrings
StringTree
Medium
50.0%
3719Longest Balanced Subarray I
Array
Medium
50.0%
772Basic Calculator IIIHard
50.0%
54Spiral Matrix
Array
Medium
37.5%
300Longest Increasing Subsequence
String
Medium
37.5%
347Top K Frequent Elements
Heap
Medium
37.5%
1319Number of Operations to Make Network Connected
GraphMath
Medium
37.5%
1537Get the Maximum ScoreHard
37.5%
6Zigzag ConversionMedium
37.5%
85Maximal RectangleHard
37.5%
1760Minimum Limit of Balls in a BagMedium
37.5%
236Lowest Common Ancestor of a Binary Tree
Tree
Medium
37.5%
31Next PermutationMedium
37.5%
283Move ZeroesEasy
37.5%
503Next Greater Element IIMedium
37.5%
759Employee Free TimeHard
37.5%
1647Minimum Deletions to Make Character Frequencies UniqueMedium
37.5%
91Decode WaysMedium
37.5%
787Cheapest Flights Within K Stops
Heap
Medium
37.5%
295Find Median from Data Stream
Heap
Hard
37.5%
380Insert Delete GetRandom O(1)Medium
37.5%
465Optimal Account BalancingHard
37.5%
2812Find the Safest Path in a GridMedium
37.5%
468Validate IP AddressMedium
37.5%
729My Calendar IMedium
37.5%
70Climbing StairsEasy
37.5%
200Number of Islands
GraphMath
Medium
37.5%
546Remove BoxesHard
37.5%
135CandyHard
37.5%