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 14 problems of 25
- #1easyfoundational
1. Two Sum
Find two indices in an array whose values sum to a target — Chegg uses this to filter for hash-map fluency on student-question lookup paths.
- #2easyfoundational
2. Valid Parentheses
Validate balanced brackets using a stack — Chegg uses this to check stack fluency for parsing student LaTeX answers.
- #3easyfoundational
3. Merge Two Sorted Lists
Splice two sorted linked lists into one — Chegg uses this to check pointer hygiene on ordered tutor-availability merges.
- #4easyfoundational
4. Remove Duplicates from Sorted Array
Dedupe a sorted array in place — Chegg uses this to check two-pointer skills for cleaning duplicate textbook-question rows.
- #5easyfoundational
5. Remove Element
Remove all occurrences of a value in place — Chegg uses this to validate two-pointer instincts on filter-content tasks.
- #6easyfoundational
6. Search Insert Position
Find the index where a target would be inserted in a sorted array — Chegg uses this to test binary-search rigor on textbook-page indexing.
- #7easyfoundational
7. Plus One
Increment a number represented by a digit array — Chegg uses this to check carry-propagation logic for tutor-session counter rollovers.
- #8easyfoundational
8. Merge Sorted Array
Merge two sorted arrays in place into the first — Chegg uses this to test reverse-pointer thinking on tutor-rating roll-ups.
- #9easyfoundational
9. Binary Tree Inorder Traversal
Return in-order values of a binary tree — Chegg uses this to check stack-based traversal on subject-taxonomy trees.
- #10easyfoundational
10. Same Tree
Check whether two binary trees are structurally identical with equal values — Chegg uses this to verify recursion fluency on duplicate-content checks.
- #11easyfoundational
11. Symmetric Tree
Detect mirror symmetry in a binary tree — Chegg uses this to test mirrored-recursion comfort on layout symmetry checks.
- #12easyfoundational
12. Maximum Depth of Binary Tree
Find the maximum depth of a binary tree — tests tree recursion fundamentals that underpin Chegg's content hierarchy traversal.
- #13easyfoundational
13. Balanced Binary Tree
Determine if a binary tree is height-balanced — tests ability to combine depth computation with tree validation, relevant to Chegg's content-tree consistency checks.
- #14easyfoundational
14. Path Sum
Check if a root-to-leaf path sums to a target — a foundational tree traversal problem Chegg uses to assess recursion and path-tracking skills.