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Lucid LeetCode Questions 2026

Browse LeetCode problems frequently asked by Lucid. Filter by difficulty and timeframe to focus your interview prep.

Last updated: 10 July 2026

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ProblemDifficultyFrequencyTopics
Valid ParenthesesEASY
75%
StringStack
Collect Coins in a TreeHARD
100%
ArrayTreeGraph TheoryTopological Sort
Maximum Number of Balls in a BoxEASY
100%
Hash TableMathCounting
Min StackMEDIUM
62.5%
StackDesign
Lowest Common Ancestor of a Binary TreeMEDIUM
62.5%
TreeDepth-First SearchBinary Tree
Number of IslandsMEDIUM
75%
ArrayDepth-First SearchBreadth-First SearchUnion-FindMatrix

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