Browse LeetCode problems frequently asked by Alibaba. Filter by difficulty and timeframe to focus your interview prep.
Last updated: 20 Feb 2026
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30 days
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More than 6 months
All
Easy
Medium
Hard
All
Problem
Difficulty
Frequency
Topics
Split Array with Equal Sum
HARD
100%
ArrayHash TablePrefix Sum
Split Concatenated Strings
MEDIUM
100%
ArrayStringGreedy
Path Sum IV
MEDIUM
100%
ArrayHash TableTreeDepth-First SearchBinary Tree
Valid Parenthesis String
MEDIUM
100%
StringDynamic ProgrammingStackGreedy
Longest Substring Without Repeating Characters
MEDIUM
62.5%
Hash TableStringSliding Window
Kth Largest Element in an Array
MEDIUM
62.5%
ArrayDivide and ConquerSortingHeap (Priority Queue)Quickselect
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