Depth-First Search Interview Questions
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coding
Apple
Google
Microsoft
Apple Coding Question: Count Occurrences in Binary Tree
Implement and optimize counting value occurrences in a binary tree. Covers single-threaded DFS, thread-safe parallel aggregation, and index-based caching. Try now.
Software Engineer, Backend EngineerEntry Level
coding
Amazon
Microsoft
Google
Binary Tree Path Sum — Amazon Coding Question Guide
Practice Amazon coding: implement root-to-leaf and any-node downward path-sum in a binary tree. Learn DFS/backtracking and prefix-sum optimizations — try code examples.
Machine Learning Engineer, Software EngineerEntry Level
coding
Meta
Facebook
Meta Coding Question: Indent Root-to-Leaf Paths by Column
Print root-to-leaf paths with per-path column shifts and indentation. See DFS approach, implementation tips, and complexity notes — try this Meta coding question now.
Software Engineer, Backend EngineerEntry Level
coding
PayPal
Amazon
Microsoft
PayPal Coding Question: Count Islands in 2D Grid with DFS
Count islands in a binary grid with num_islands using DFS/BFS. Includes approach, code hints, and time & space analysis to prepare for PayPal coding interviews.
Machine Learning Engineer, Software EngineerEntry Level
online assessment
PayPal
Amazon
Uber
PayPal Word Search Grid Interview - DFS Backtracking
Practice PayPal's word search assessment: find a target string in a letter grid using DFS and backtracking. Get approach, edge-case tips, and performance notes.
Software Engineer, Backend EngineerEntry Level
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