10 top Amazon interview questions frequently asked for DSA (Data Structures and Algorithms)
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Here are 10 top Amazon interview questions frequently asked for DSA (Data Structures and Algorithms) roles:

Arrays & Hashing:

  1. Two Sum: Given an array of integers and a target sum, find two numbers in the array that add up to the target. (Easy)
  2. Maximum Subarray: Find the contiguous subarray within an array that has the largest sum. (Easy/Medium)

Linked Lists:

  1. Reverse a Linked List: Reverse a singly linked list in place. (Easy)
  2. Merge Two Sorted Linked Lists: Merge two sorted linked lists into a single sorted linked list. (Easy/Medium)

Stacks & Queues:

  1. Implement a Stack with min() in O(1) time: Create a stack data structure with push(), pop(), and min() operations, all taking constant time. (Medium)

Trees:

  1. Lowest Common Ancestor (LCA) in a Binary Search Tree (BST): Find the lowest common ancestor of two given nodes in a BST. (Medium)
  2. Level Order Traversal of a Binary Tree: Traverse a binary tree level by level, visiting all nodes at each level from left to right. (Easy/Medium)

Searching & Sorting:

  1. Search in a Rotated Sorted Array: Search for a given element in a sorted array that has been rotated an unknown number of times. (Medium)
  2. Kth Largest Element: Find the kth largest element in an unsorted array. (Medium)

Others:

  1. Trapping Rain Water: Given a collection of buildings represented by heights, calculate how much rainwater could be trapped between them. (Medium)
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