Byju's Coding Interview Questions
25 Byju's coding interview problems with full optimal solutions — 10 easy, 11 medium, 4 hard. Every problem ships with multiple approaches (brute-force first, then the optimal), complexity tables for each, company-specific tips on what an Byju's interviewer values, and a FAQ section.
Showing 10 problems of 25
- #1easyfoundational
1. Two Sum
Given an array of integers, return indices of two numbers adding to a target.
- #2easyfoundational
2. Valid Parentheses
Determine whether a string of brackets is correctly balanced and nested.
- #3easyfoundational
3. Merge Two Sorted Lists
Merge two sorted singly linked lists into one sorted list by splicing nodes.
- #4easyfoundational
4. Maximum Depth of Binary Tree
Return the depth of a binary tree, measuring the longest root-to-leaf path.
- #5easyfoundational
5. Best Time to Buy and Sell Stock
Maximize profit from one buy and one sell across an array of daily prices.
- #6easyfoundational
6. Single Number
Find the lone integer in an array where every other number appears twice.
- #7easyfoundational
7. Min Stack
Design a stack supporting push, pop, top, and O(1) minimum retrieval.
- #8easyfoundational
8. Majority Element
Find the element appearing more than n/2 times in an array.
- #9easyfoundational
9. Reverse Linked List
Reverse a singly linked list in place.
- #10easyfoundational
10. Invert Binary Tree
Mirror a binary tree by swapping left and right children at every node.