Lucid

7 LeetCode interview questions

Difficulty Distribution

Easy

2

29%

Medium

4

57%

Hard

1

14%

Top Topics

String(2)Stack(2)Array(2)Tree(2)Hash Table(2)Depth-First Search(2)Graph Theory(1)Topological Sort(1)Math(1)Counting(1)

All Questions

Title	Difficulty	Acceptance	Frequency	Topics
Collect Coins in a Tree	Hard	39.6%	100.0%	ArrayTreeGraph Theory+1
Maximum Number of Balls in a Box	Easy	74.7%	100.0%	Hash TableMathCounting
Valid Parentheses	Easy	43.7%	75.0%	StringStack
Number of Islands	Medium	63.8%	75.0%	ArrayDepth-First SearchBreadth-First Search+2
Longest Substring Without Repeating Characters	Medium	38.5%	62.5%	Hash TableStringSliding Window
Min Stack	Medium	57.7%	62.5%	StackDesign
Lowest Common Ancestor of a Binary Tree	Medium	68.7%	62.5%	TreeDepth-First SearchBinary Tree

Showing 7 of 7 questions