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Last updated: 20 Feb 2026
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30 days
3 months
6 months
More than 6 months
All
Easy
Medium
Hard
All
Problem
Difficulty
Frequency
Topics
Encode Number
MEDIUM
87.5%
MathStringBit Manipulation
1-bit and 2-bit Characters
EASY
87.5%
Array
Sort the Matrix Diagonally
MEDIUM
87.5%
ArraySortingMatrix
Maximum Number of Words You Can Type
EASY
87.5%
Hash TableString
Range Frequency Queries
MEDIUM
87.5%
ArrayHash TableBinary SearchDesignSegment Tree
Number of Subarrays with Bounded Maximum
MEDIUM
50%
ArrayTwo Pointers
Exam Room
MEDIUM
87.5%
DesignHeap (Priority Queue)Ordered Set
Subtract the Product and Sum of Digits of an Integer
EASY
87.5%
Math
Find Numbers with Even Number of Digits
EASY
87.5%
ArrayMath
Find the K-Beauty of a Number
EASY
87.5%
MathStringSliding Window
3Sum With Multiplicity
MEDIUM
87.5%
ArrayHash TableTwo PointersSortingCounting
Substrings of Size Three with Distinct Characters
EASY
87.5%
Hash TableStringSliding WindowCounting
Get Biggest Three Rhombus Sums in a Grid
MEDIUM
87.5%
ArrayMathSortingHeap (Priority Queue)MatrixPrefix Sum
Construct Target Array With Multiple Sums
HARD
100%
ArrayHeap (Priority Queue)
Finding Pairs With a Certain Sum
MEDIUM
87.5%
ArrayHash TableDesign
Subarray Sum Equals K
MEDIUM
62.5%
ArrayHash TablePrefix Sum
Insert Delete GetRandom O(1)
MEDIUM
75%
ArrayHash TableMathDesignRandomized
Text Justification
HARD
62.5%
ArrayStringSimulation
Longest Common Prefix
EASY
62.5%
ArrayStringTrie
Serialize and Deserialize Binary Tree
HARD
50%
StringTreeDepth-First SearchBreadth-First SearchDesignBinary Tree
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