Chegg Coding Interview Questions
25 Chegg coding interview problems with full optimal solutions — 14 easy, 8 medium, 3 hard. Every problem ships with multiple approaches (brute-force first, then the optimal), complexity tables for each, company-specific tips on what an Chegg interviewer values, and a FAQ section.
Showing 8 problems of 25
- #15mediumfoundational
15. Number of Islands
Count connected components of '1's in a 2D grid — a graph traversal problem that mirrors Chegg's recommendation engine grouping related educational content.
- #16mediumfoundational
16. Course Schedule
Detect if all courses can be finished given prerequisites — directly mirrors Chegg's curriculum graph where course dependencies must be cycle-free.
- #17mediumfoundational
17. Implement Trie (Prefix Tree)
Build a trie supporting insert, search, and startsWith — directly maps to Chegg's search autocomplete and prefix-based textbook lookup features.
- #18mediumfoundational
18. Kth Largest Element in an Array
Find the kth largest element without full sorting — a selection algorithm Chegg applies when ranking educational content by relevance score.
- #19mediumfoundational
19. Word Search
Search for a word in a 2D character grid using DFS with backtracking — tests backtracking fundamentals Chegg applies to plagiarism detection across document matrices.
- #20mediumfoundational
20. Construct Binary Tree from Preorder and Inorder Traversal
Reconstruct a binary tree from two traversal orders — tests tree manipulation depth that Chegg uses for rebuilding content category hierarchies from index data.
- #21mediumfoundational
21. Longest Consecutive Sequence
Find the longest consecutive integer sequence in O(n) using a hash set — Chegg applies this pattern when detecting sequential gaps in student progress data.
- #22mediumfoundational
22. Word Break
Determine if a string can be segmented into dictionary words — Chegg uses this DP pattern for tokenizing educational query strings and segmenting compound subject names.