Browse LeetCode problems frequently asked by Rakuten. Filter by difficulty and timeframe to focus your interview prep.
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
Longest Happy String
MEDIUM
87.5%
StringGreedyHeap (Priority Queue)
LRU Cache
MEDIUM
87.5%
Hash TableLinked ListDesignDoubly-Linked List
Rotate Image
MEDIUM
87.5%
ArrayMathMatrix
3Sum
MEDIUM
87.5%
ArrayTwo PointersSorting
String Compression
MEDIUM
87.5%
Two PointersString
Rotting Oranges
MEDIUM
87.5%
ArrayBreadth-First SearchMatrix
Combination Sum II
MEDIUM
100%
ArrayBacktracking
Climbing Stairs
EASY
87.5%
MathDynamic ProgrammingMemoization
Longest Substring Without Repeating Characters
MEDIUM
87.5%
Hash TableStringSliding Window
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