Udemy Coding Interview Questions
26 Udemy coding interview problems with full optimal solutions — 15 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 Udemy interviewer values, and a FAQ section.
Showing 15 problems of 26
- #1easyfoundational
1. Two Sum
Find two indices that sum to a target — Udemy's warm-up hash-map check before deeper course-search or payment questions.
- #2easyfoundational
2. Valid Parentheses
Validate that brackets nest correctly — a stack warm-up Udemy uses to gauge whether you reach for the right data structure before the harder DRM/search rounds.
- #3easyfoundational
3. Merge Two Sorted Lists
Merge two sorted linked lists into one sorted list — Udemy uses this to test pointer hygiene before deeper recommendation-feed merge questions.
- #4easyfoundational
4. Remove Duplicates from Sorted Array
Dedupe a sorted array in place — Udemy uses this to gauge two-pointer hygiene before dedupe questions on course catalog imports.
- #5easyfoundational
5. Remove Element
Strip occurrences of a value in place — Udemy uses this to test pointer mechanics before harder catalog-cleanup problems.
- #6easyfoundational
6. Search Insert Position
Find the index of a target or where it would insert — Udemy's classic binary-search check before course-catalog lookup questions.
- #7easyfoundational
7. Maximum Subarray
Find the contiguous subarray with the largest sum — Udemy uses Kadane to test whether you can recognize a DP pattern in a casual array problem.
- #8easyfoundational
8. Plus One
Increment a big integer represented as a digit array — Udemy uses this to test carry handling before deeper payment-amount math problems.
- #9easyfoundational
9. Merge Sorted Array
Merge two sorted arrays into the first in place — Udemy uses this to test reverse-pointer thinking before merging course-result feeds.
- #10easyfoundational
10. Binary Tree Inorder Traversal
Walk a binary tree in inorder — Udemy uses this as a stack-recursion warm-up before harder course-category tree problems.
- #11easyfoundational
11. Same Tree
Decide whether two binary trees are structurally and value-equal — Udemy uses this to test recursive equality before harder course-tree diff problems.
- #12easyfoundational
12. Symmetric Tree
Check whether a binary tree is a mirror of itself — a Udemy warm-up that tests recursive thinking around tree structure.
- #13easyfoundational
13. Maximum Depth of Binary Tree
Find the maximum depth of a binary tree — Udemy uses this to probe recursive DFS fundamentals before asking about course-category tree traversals.
- #14easyfoundational
14. Balanced Binary Tree
Determine if a binary tree is height-balanced — Udemy uses this to test whether candidates can avoid redundant tree traversals with a bottom-up approach.
- #15easyfoundational
15. Path Sum
Check if a root-to-leaf path sums to a target — Udemy uses this as a gateway to harder path-aggregation problems in recommendation scoring.