Amazon Interview Questions
- 0of 0 votes
AnswersDesign a music streaming service like Pandora.
- sarunreddy82 May 28, 2018 in United States| Report Duplicate | Flag | PURGE
Amazon System Design - 0of 0 votes
AnswersHow you will design and make a website like Hackerrank? How you will measure and limit the running time and memory usage of the program.
- johnallen582 May 25, 2018 in India for AWS| Report Duplicate | Flag | PURGE
Amazon Software Developer System Design - 1of 1 vote
AnswersDesign a class for converting integer to Roman numerals.
- CoderLonely May 24, 2018 in United States| Report Duplicate | Flag | PURGE
Amazon Software Engineer / Developer - 1of 1 vote
AnswersGiven k, and a binary string, determine if this contains all permutations of length k.
- ajay.raj May 24, 2018 in United States
For example, 11001 contains all possible binary sequences with k=2 (00,01,10,11)| Report Duplicate | Flag | PURGE
Amazon SDE1 - 0of 0 votes
AnswersDesign the Goodreads recommendation model.
- csk May 23, 2018 in United States
Goodreads is a "social networking book" website that allows individuals to freely search its database of books.
- Any given user has a List of friends.
- User can add books to his/her shelve
- When a user logs in, we need to show the top 10 books owned by his friends
Example:
User1 has u2, u3, u4, u5 as friends
u2 owns b1, b2, …b10
u3 own b1, b2, b11…b20
u4 owns b1, b2, b11…b20
u5 owns b1, b33, b35, etc
topmost book is b1, second topmost book is b2 and so on.
If you maintain a cache of top 10 books in the user object for each of the users. How often will you update the cache ?| Report Duplicate | Flag | PURGE
Amazon - 0of 0 votes
AnswersYou have been given a generator string ab from which any number of strings can be generated recursively by inserting ‘ab’ at any location. You have been given an input string to check if that given string is valid or not.(i.e. generated by given with given string.)
- akisonlyforu May 22, 2018 in India
eg.
Input: aabbab
Output: valid
Input: abbaab
Output: Invalid
I could not come up with a algorithm less than O(N*N)| Report Duplicate | Flag | PURGE
Amazon SDE1 Algorithm - 0of 0 votes
AnswerGiven a multiple tree, and multiple nodes that need to be deleted,
- ajay.raj May 17, 2018 in United States
It is required to return a list of nodes so that the children of these nodes can be found after the nodes have been deleted.| Report Duplicate | Flag | PURGE
Amazon SDE1 - 1of 1 vote
AnswersGives you an int m, and a set of char (0,1,2,3,4,5,6,7,8,9)
- ajay.raj May 17, 2018 in United States
Lets you implement a function that generates a id based on the characters in the set. Each time you return a string, it must be unique. satisfying the same character can not appear consecutively more than m times, such as m = 3, "1000" is valid,
"0000" is not valid.
The smaller the string, the better.| Report Duplicate | Flag | PURGE
Amazon SDE1 - 1of 1 vote
AnswersLet’s say you have two input arrays with sorted elements. Find the union.
- prasad.hybris May 16, 2018 in United States
a[] = {2, 10, 14, 19, 51, 71}
b[] = {2, 9, 19, 40, 51}
Union = {2, 9, 10, 14, 19, 40, 51}| Report Duplicate | Flag | PURGE
Amazon SDE1 Java - 0of 0 votes
AnswersA group of friends are tracking the miles per gallon for each of their cars. Each time one of them fills up their gas tank, they record the following in a file: His or her name The type of car they drove How many miles driven since they last filled up How many gallons purchased at this fill up Date of the fill Their data is formatted as a comma separate value (csv) file with the following format for each row:(#person,carName,milesDriven,gallonsFilled,fillupDate) Miles are recorded as floating-point numbers and gallons as integers. Please create a program that allows members of this group to determine the miles per gallon (MPG) of each of their cars during a specific time range. Note: person may have more than one so a time range query might need to output data for one or more cars. A skeleton class will be provided; your job will be to complete the program. The principal function for querying MPG is of the form (the exact name, data types, etc., can be learned by inspecting the "solution" class in the skeleton code): GetRangeMPG(PersonName, StartDate, EndDate) Returns list of objects containing (CarName, MPG) MPG is calculated as (total miles traveled during time period)/ (total gallons filled during time period. The dates you receive in the query should be treated inclusively.
- pragramticProgrammer May 15, 2018 in United States| Report Duplicate | Flag | PURGE
Amazon SDE1 .Net/C# - 1of 1 vote
AnswerTo push dominoes, find out how many dominoes are standing in the end
- ajay.raj May 15, 2018 in United States
For example, the input is ".R...RL..R..L..", which means pushing the 2nd, 6th, and 12th dominoes to the right and pushing the 8th and 15th dominoes to the left. This example returns 4th. 1,7,16,17 blocks are standing| Report Duplicate | Flag | PURGE
Amazon SDE1 - 1of 1 vote
AnswersThe question is that there are a lot of vm, what is the total vm consumption max. For example, (2,4,8), (3,5,3) this input,
- ajay.raj May 15, 2018 in United States
This means that 2 to 4 seconds have a memory usage of 8 and 3 to 5 seconds of 3, so the answer is 11 at 3 seconds.
Return 11 to it. Note that (1,2,3) and (2,3,4) such that the middle 3+4=7 is good.
Follow up is usage is not constant, such as (1,2,1,2) the first second usage is 1,
The second second is 2, the linear increase, the highest is how much.| Report Duplicate | Flag | PURGE
Amazon SDE1 - 0of 0 votes
AnswersGiven an alphabet where we do not know the order of the letters also do not know the number of letters.
- teli.vaibhav May 14, 2018 in United States
We are give an input list of tuples where each entry in the list gives an ordering between the 2 letters
Determine the alphabet order.
Ex-
<A, B>
<C, D>
<C, E>
<D, E>
<A, C>
<B, C>
Order is A, B, C, D, E| Report Duplicate | Flag | PURGE
Amazon SDE-2 Algorithm - 2of 2 votes
AnswersAWS phone interview
- aonecoding May 13, 2018 in United States
Find the left view of binary tree
1
/ \
2 3
/\ \
4 5 6
/ /
7 8
/
9
return [1, 2, 4, 7, 9]| Report Duplicate | Flag | PURGE
Amazon Software Engineer Algorithm - 0of 0 votes
AnswersGiven as list of movies in a csv file, extract the movie name and genre and be able to return a query based on the years and the genre.
- pragramticProgrammer May 13, 2018 in United States
Basically, Parsing a CSV input file and build an indexed data storage to allow search the data in time manner.| Report Duplicate | Flag | PURGE
Amazon SDE1 .Net/C# - 0of 0 votes
AnswersGiven a list of tasks each with memory requirements and time, only one machine has K memory.
- ajay.raj May 12, 2018 in United States
Do not consider the context switch, page swap, virtual memory, (for example, the machine has only 20mb memory, a task that requires 25MB of the task can only wait until there is enough memory to run it.) The running task cannot be suspended.
Ask how long it takes to complete all these tasks. . .| Report Duplicate | Flag | PURGE
Amazon SDE1 - 0of 0 votes
Answers1) You sell roses. Each rose cost 30 cents to buy and you can sell them for $10 a dozen.
- venkateshumamaheswaran May 08, 2018 in United States
a) How many you need to sale to break even if you bought 600 roses?
b) Tomorrow is holiday - there's 20% likelihood you will sale 600 roses, 50% likelihood of selling 900 roses and 30% likelihood of selling 1200 roses. How many would you buy to maximize profit?| Report Duplicate | Flag | PURGE
Amazon Probability - 1of 1 vote
AnswersWrite a method that can take in an unordered list of airport pairs visited during a trip, and return the list in order:
- mandy May 08, 2018 in United States
Unordered: ("ITO", "KOA"), ("ANC", "SEA"), ("LGA", "CDG"), ("KOA", "LGA"), ("PDX", "ITO"), ("SEA", "PDX")
Ordered: ("ANC", "SEA"), ("SEA", "PDX"), ("PDX", "ITO"), ("ITO", "KOA"), ("KOA", "LGA"), ("LGA", "CDG")| Report Duplicate | Flag | PURGE
Amazon Software Engineer - 0of 0 votes
Answers/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode(int x) { val = x; }
* }
*/Find the largest duplicate subtree in a binary tree For example, 1 / \ 2 3 / / \ 4 2 4 / 4 The following are two duplicate subtrees: 2 / 4 and 4
but the former is the largest, thus return the root of the first subtree
- ajay.raj May 05, 2018 in United States| Report Duplicate | Flag | PURGE
Amazon Software Engineer - 0of 0 votes
AnswersGiven a target string, an input request replaces the word after the given index a->b such as:
- ajay.raj May 04, 2018 in United States
Target string: "Hello world!"
Input:{s:0, a:Hello b: Goodbye}
Output:"Goodbye world!".
The requirement is that input be given to several words that need to be changed at one time: {{s:0,a:Hello,b:Goodbye},{s:11,a:!,b:?},{s:6 a: World,b:friend}}
And each modified index is based on the original unmodified target string so the end result is
"Goodbye friend?"| Report Duplicate | Flag | PURGE
Amazon Software Engineer - 0of 0 votes
Answersgiven a n-ary tree, find the total distance from this node to any other nodes
- ajay.raj May 04, 2018 in United States
class TreeNode {
int val;
List<TreeNode> children;
TreeNode(int val) {
this.val = val;
children = new ArrayList<>();
}
}
public int findDistance(TreeNode root, TreeNode node) {
}| Report Duplicate | Flag | PURGE
Amazon Software Engineer - 1of 1 vote
AnswersHow many squares are inside a m*n rectangle where some grids in the rectangle were grey and the gray grid could not appear in the small squares.
- ajay.raj May 03, 2018 in United States| Report Duplicate | Flag | PURGE
Amazon SDE1 - 1of 1 vote
AnswersGiven an int array, check if all the numbers can be divided into 5 consecutive numbers.
- ajay.raj May 03, 2018 in United States
Eg: [1,2,2,3,3,4,4,5,5,6] Yes: (1,2,3,4,5) (2,3,4,5,6)
Followup: ask if you know that all the numbers are between 1 and 13,
what's a good optimization.| Report Duplicate | Flag | PURGE
Amazon SDE1 - 1of 1 vote
AnswerYou have two matrixs, how to move the first matrix
(move up, down, left, and right) so that the two matrix in the two matrixs match most.eg: matrix 1: matrix 2: 0 0 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 0
Then, after taking matrix1 (1 left shift + 1 down),
- ajay.raj May 03, 2018 in United States
the number of 1 in the match with matrix2 is 3| Report Duplicate | Flag | PURGE
Amazon SDE1 - 0of 0 votes
Answershow to check if two graphs are structurally identical
- ajay.raj May 03, 2018 in United States
class UndirectedGraphNode {
List<UndirectedGraphNode> neighbors;
UndirectedGraphNode() {
neighbors = new ArrayList<>();
}
}| Report Duplicate | Flag | PURGE
Amazon SDE1 - 1of 1 vote
Answersconvert a Sorted array to complete BST
- ajay.raj May 02, 2018 in United States| Report Duplicate | Flag | PURGE
Amazon SDE1 - 0of 0 votes
AnswerGive a connected graph, no cycle,
- ajay.raj May 01, 2018 in United States
Find the node where the average distance from all other nodes is the smallest| Report Duplicate | Flag | PURGE
Amazon SDE1 - 0of 0 votes
AnswerInput: an int array without sorting, then do a binary search on it, and find the number of digits that cannot be found by binary search.
- ajay.raj May 01, 2018 in United States| Report Duplicate | Flag | PURGE
Amazon SDE1 - 0of 0 votes
Answers<key = "a"; val = "3"; depend_list = null;/>; <key = "b"; val = "a * a";
- ajay.raj May 01, 2018 in United States
Depend_list = {a};/>; <key = "c"; val = "a * b"; depend_list = {a,b};/>;
Lets output a map<key, value>,a -> 3, b -> 9, c -> 27
Follow-up questions: Make a statistic for all keys and corresponding map entries with the same value.| Report Duplicate | Flag | PURGE
Amazon SDE1 - 0of 0 votes
AnswersGiven an array, find an x such that all numbers less than x are equal to themselves. Numbers greater than it are equal to x, and all numbers add up to a target
- ajay.raj May 01, 2018 in United States
For example, [1 3 5 7 9] target=24, answer is8. Because when x=8, the array has only 9>8, so 1+3+5+7+8=24 is the closest to the target.| Report Duplicate | Flag | PURGE
Amazon SDE1