Amazon’s Most Frequently Asked Questions | Set 1 

Level – Easy 
 

1. Get minimum element from stack – Practice here
2. Serialize and deserialize a binary tree – Practice here
3. Print a binary tree in a vertical order – Practice here
4. Celebrity problem – Practice here
5. Level order traversal
6. Swap the kth element from starting and from the end position – Practice here
7. Binary tree to bst – Practice here
8. Max sum in the configuration – Practice here
9. Find the nth element of spiral matrix – Practice here
10. Count the number of occurrences in a sorted array
11. Find the smallest window in a string containing all characters of another string
12. Find the maximum of all subarrays of size k
13. Find the kth smallest element in row wise and column wise sorted matrix
14. Minimum swaps required to arrange pairs
15. There is an array of N numbers ranging from 1 to N. Only 1 number is missing, return the index of that number
16. Find the second largest and second smallest in a given array in single traversal.
17. Find power(x,y) without using pow function.(divide and conquer approach required)
18. Count possible decoding sequence

Level – Medium 
 

1. Given two string print them inter leaving strings characters
2. Minimum cost required to travel from top left to the bottom right in a matrix
3. Maximum difference between node and its ancestors – Practice here
4. Min distance between two given nodes of a binary tree – Practice here
5. Find the number of island – Practice here
6. Topological Sort – Practice here
7. Detect cycle in a directed graph – Practice here
8. Flattening a link list – Practice here
9. Detect a loop in a linked list – Practice here
10. Check if a binary tree is BST or not
11. Min Cost path
12. Count ways to reach nth stair
13. Maximum Subarray Problem
14. Palindrome Partitioning
15. Given a binary tree find the minimum root to leaf height.
16. Implement LRU cache

Level – Hard 
 

1. Boolean paranthesis – Practice here
2. Maximum Index – Practice here
3. Largest Number formed in the array – Practice here
4. Find the length of maximum numbers of consecutive numbers jumped up in an array
5. Delete the elements in a linklist whose sum is equal to zero
6. Given a list of numbers of odd length design an algorithm to remove a number and divide the rest numbers equaly so as it makes there sum same
7. Find diameter of a binary tree

Also see 
 

• Amazon Interview Experiences
• Amazon Practice Questions
• Top topics for Interview Preparation

You may also like to see following Amazon Interview Video. 

https://www.youtube.com/watch?v=il_t1WVLNxk&t=25s 

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