Amazon Programming Interview Questions

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(Last Updated 2019-Nov-17)

Newest Amazon Programming Interview Questions 2019:

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Given a two 2D integer array, find the max score of a path from the upper left corner to bottom right corner. The score of a path is the minimum value in that path.

Given a two 2D integer array, find the max score of a path from the upper left corner to bottom right corner. The score of a path is the minimum value in that path.

Given a M-ary tree, find the subtree with maximum average. Return the root of the subtree.

Given a BST, and an integer k, cut the BST vertically into two substrees A and B, where all nodes in A <= k and all nodes in B > k.

Given a binary tree and a list of nodes say [n1, n2, .. nk], write a program to find the least common ancestor.

You are given a huge number of IPs in a list. Remove all duplicated addresses from the list.

Design and implement the Least Recently Used Cache with TTL(Time To Live)

A group of friends decide to meetup on a chosen date. Everyone in the group provides...

You can find a word in 2d array if the word is constructed by a sequence of adjacent letters

Given a series of equations e.g. [A = B, B = D, C = D, F = G, E = H, H = C] and then another series [A != C, D != H, ..., F != A ]

Check whether the equations combined is valid.

For the example given, your program should return 'invalid', because the first series implies that A = C, which contradicts the statement A != C in the second series.

Give m balls and n bins. Find out how many ways to assign balls to bins. Notice the buckets has no order. Like (1,2,3) and (3,2,1) are considered the same.
eg, m = 3, n = 2, return 2. (1, 2) and (3, 0)

AWS phone interview
Find the left view of binary tree

      / \ 
     2   3 
     /\   \ 
    4 5   6 
   /  / 
  7  8 
return [1, 2, 4, 7, 9]

Given an ArrayList of Nodes, with each Node having an ID and a parent ID, determine whether the List is given in preorder.

Find the indices of all anagrams of a given word in a another word.
For example: Find the indices of all the anagrams of AB in ABCDBACDAB
(Answer: 0, 4, 8)

Phone Interview Amazon, Seattle
I. Get the sum of all prime numbers up to N. primeSum(N).
Follow-up: If primeSum(N) is frequently called, how to optimize it.
II. OODesign Parking Lot

Given a binary tree, find the closest LEAF node to the target.

Amazon On-site in Seattle
Every round has behavioral questions followed by tech questions.
1st Round: by interviewer and a shadow.
Question: Compare two calendar dates (There is only Year/Month/Day in the given date stamp). It is a simple question but you’ll need to dig for further information from the discussion with interviewer.
2nd Round: by hiring manager.
Question: Design parking lot. The interviewer asked me to draw the block diagram to show relations among objects.
3rd Round: by an interviewer
Question: Assume that a video service calls a function every time someone watches a video. Build a function that returns the n most viewed videos an hour ago till now.
4th Round : by interviewer and a shadow.

Amazon On-site Seattle AD Team SDE I
Interviewee is a new graduate, Master’s Degree in Computer Science.
Location: on-site Seattle
Team: Amazon AD
Position: SDE1
There are four rounds in total from 9.30am to 12.45pm. The schedule is pretty intense as there was only one 10 minutes break. The third round was a big challenge for me.

Second Round On-site Interview with Amazon
1st Question reorder linked list in this way
Given x1 -> x2 ->x3…-> y3 -> y2 -> y1
Reorder it to x1 -> y1 -> x2 -> y2 -> x3 -> y3

A queue of people are waiting to buy ice cream from you.
Each person buys one ice cream, which sells for $5.
Each customer is holding a bill of $5, $10 or $20.
Your initial balance is 0.
Find whether you will be able to make change for every customer in the queue. You must serve customers in the order they come in.

Most Frequently Asked Amazon Programming Interview Questions
  • LeetCode

    167 Two Sum II - Input array is sorted Easy
    78 Subsets Medium
    89 Gray Code Medium
    199 Binary Tree Right Side View Medium
    23 Merge k Sorted Lists Hard
    200 Number of Islands Medium
    5 Longest Palindromic Substring Medium
    8 String to Integer (atoi) Medium
    49 Group Anagrams Medium
    98 Validate Binary Search Tree Medium
    102 Binary Tree Level Order Traversal Medium
    48 Rotate Image Medium
    236 Lowest Common Ancestor of a Binary Tree Medium
    240 Search a 2D Matrix II Medium
    239 Sliding Window Maximum Hard
    121 Best Time to Buy and Sell Stock Easy
    234 Palindrome Linked List Easy
    238 Product of Array Except Self Medium
    204 Count Primes Easy
    235 Lowest Common Ancestor of a Binary Search Tree Easy
    297 Serialize and Deserialize Binary Tree Hard
    186 Reverse Words in a String II Medium
    160 Intersection of Two Linked Lists Easy
    20 Valid Parentheses Easy
    138 Copy List with Random Pointer Medium
    42 Trapping Rain Water Hard
    141 Linked List Cycle Easy
    127 Word Ladder Medium
    242 Valid Anagram Easy
    126 Word Ladder II Hard
    215 Kth Largest Element in an Array Medium
    139 Word Break Medium
    21 Merge Two Sorted Lists Easy
    2 Add Two Numbers Medium
    206 Reverse Linked List Easy
    3 Longest Substring Without Repeating Characters Medium
    15 3Sum Medium
    146 LRU Cache Hard
    17 Letter Combinations of a Phone Number Medium
    1 Two Sum Easy
    155 Min Stack Easy
    355 Design Twitter Medium
    380 Insert Delete GetRandom O(1) Medium
    396 Rotate Function Medium
    387 First Unique Character in a String Easy
    414 Third Maximum Number Easy
    73 Set Matrix Zeroes Medium
    438 Find All Anagrams in a String Easy
    119 Pascal's Triangle II Easy
    451 Sort Characters By Frequency Medium
    449 Serialize and Deserialize BST Medium
    459 Repeated Substring Pattern Easy
    460 LFU Cache Hard
    508 Most Frequent Subtree Sum Medium
    516 Longest Palindromic Subsequence Medium
    517 Super Washing Machines Hard
    529 Minesweeper Medium
    532 K-diff Pairs in an Array Easy
    535 Encode and Decode TinyURL Medium
    536 Construct Binary Tree from String Medium
    538 Convert BST to Greater Tree Easy
    537 Complex Number Multiplication Medium
    545 Boundary of Binary Tree Medium
    553 Optimal Division Medium
    579 Find Cumulative Salary of an Employee Hard
    606 Construct String from Binary Tree Easy
    617 Merge Two Binary Trees Easy
    640 Solve the Equation Medium
    645 Set Mismatch Easy
    646 Maximum Length of Pair Chain Medium
    661 Image Smoother Easy
    662 Maximum Width of Binary Tree Medium
    663 Equal Tree Partition Medium
    675 Cut Off Trees for Golf Event Hard
    682 Baseball Game Easy
    694 Number of Distinct Islands Medium
    692 Top K Frequent Words Medium
    711 Number of Distinct Islands II Hard
    189 Rotate Array Easy
    725 Split Linked List in Parts Medium
    738 Monotone Increasing Digits Medium
    742 Closest Leaf in a Binary Tree Medium
    746 Min Cost Climbing Stairs Easy
    762 Prime Number of Set Bits in Binary Representation Easy
    763 Partition Labels Medium
    771 Jewels and Stones Easy
    775 Global and Local Inversions Medium
    776 Split BST Medium
    791 Custom Sort String Medium
    801 Minimum Swaps To Make Sequences Increasing Medium
    819 Most Common Word Easy
    842 Split Array into Fibonacci Sequence Medium
    851 Loud and Rich

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