## Recent Interview Questions

- 2of 2 votes

AnswersWrite a function that takes a list L and returns a random sublist of size N of that list. Assume that the indexes must be in increasing order. That is, you cannot go backwards.

- neer.1304 July 03, 2019 in United States

Example:

L = [1, 2, 3, 4, 5]

N = 3

The function should return one of these lists:

[1, 2, 3]

[1, 2, 4]

[1, 2, 5]

[1, 3, 4]

[1, 3, 5]

[1, 4, 5]

[2, 3, 4]

[2, 3, 5]

[2, 4, 5]

[3, 4, 5]| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 0of 0 votes

AnswerConsider an undirected tree with N nodes, numbered from 1 to N. Each node has a label associated with it, which is an integer value. Different nodes can have the same label. Write a function that, given a zero indexed array A of length N, where A[j] is the label value of the (j + 1)-th node in the tree and a zero-indexed array E of length K = (N – 1) * 2 in which the edges of the tree are described, returns the length of the longest path such that all the nodes on that path have the same label. The length is the number of edges in that path.

- neer.1304 July 03, 2019 in United States

Example:

A = [1, 1, 1, 2, 2]

E = [1, 2, 1, 3, 2, 4, 2, 5]

This tree is shown below. A node follows the form label, value.

----------1, 1

-----1, 2 1, 3

2, 4 2, 5

The function should return 2, because the longest path is 2->1->3, and there are 2 edges in this path.

Assume that 1 <= N <= 1000 and each element of the array A is an integer in the range [1, 1000000000].| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 2of 2 votes

AnswersGiven a string A consisting of n characters and a string B consisting of m characters, write a function that will return the number of times A must be stated such that B is a substring of the repeated A. If B can never be a substring, return -1.

- neer.1304 July 03, 2019 in United States

Example:

A = ‘abcd’

B = ‘cdabcdab’

The function should return 3 because after stating A 3 times, getting ‘abcdabcdabcd’, B is now a substring of A.

You can assume that n and m are integers in the range [1, 1000].| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 0of 0 votes

AnswersGiven 1-D list of co-ordinates determine if interval (a,b) is covered

- neer.1304 July 03, 2019 in United States

Ex - [(2,5), (5,7),(1,4)] and interval = (1,6)

return true

Explanation - Points 1 to 6 lies in list of interval given 1 to 4. 2 to 5 and 5 to 7.

[(1,4),(6,7),(2,5)] and interval - (1,6)

return false

Explanation - Distance between 5 to 6 is not covered in the list given so return false| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 0of 0 votes

AnswerCompare two documents(string array) based on n grams.

- neer.1304 July 03, 2019 in United States

e.g doc1 – Today is Sunday.

doc2 – Today is Saturday

if n = 2 then number of duplicates is 1 (Today is)

if n = 1 then number of duplicates is (Today, is)

if n = 3 duplicates is 0| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 0of 0 votes

AnswersGiven a bench with n seats and few people sitting, tell the seat number each time when a new person goes to sit on the bench such that his distance from others is maximum

- neer.1304 July 03, 2019 in United States| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 1of 1 vote

AnswersGiven a room with thief on left side of the room with finite number of sensors. He has to reach on right side missing the sensors. Each sensor is placed at any random point in the room and has its coverage in the radius r. Find out if the thief can reach to the right side without touching the range of any sensor.

- neer.1304 July 03, 2019 in United States| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 2of 2 votes

AnswerGiven an infinite chessboard, find minimum no. of steps for a knight to reach from the origin to (x, y).

- neer.1304 July 03, 2019 in United States

Extension A list of forbidden coordinates are introduced where knight can’t reach. Handle this in your code. Make sure the infinite loop is handled since the board is infinite.| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 0of 0 votes

AnswersGiven a matrix of people(denoted by small alphabets) and bikes(denoted by capital alphabets), find the nearest bike for a given person.

- neer.1304 July 03, 2019 in United States

How will you change your solution if you have to find bikes for a set of people? (assuming multiple bikes can be at the same distance from 1 person)| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 1of 1 vote

AnswersGiven an array of n integers, find the lexicographically smallest subsequence of length k.

- neer.1304 July 03, 2019 in United States| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 1of 1 vote

AnswersGiven a list of player names and their scores – {Carl, 70; Alex, 55; Isla, 40}, design a data structure that can support following modules in optimal time-

- neer.1304 July 03, 2019 in United States

i) updateEntry(string name)

ii) getEntryFromRank(int rank)| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 0of 0 votes

AnswersGiven an input stream of boolean values, design a data structure that can support following modules in optimal time-

- neer.1304 July 03, 2019 in United States

i) setTrue(index)

ii) setFalse(index)

iii) setAllTrue()

iv) setAllFalse()

v) getIndex(index)| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 1of 1 vote

AnswersGiven two strings, A and B, of equal length, find whether it is possible to cut both strings at a common point such that the first part of A and the second part of B form a palindrome.

- neer.1304 July 03, 2019 in United States

Extension1. How would you change your solution if the strings could be cut at any point (not just a common point)?

Extension2. Multiple cuts in the strings (substrings to form a palindrome)? Form a palindrome using a substring from both strings. What is its time complexity?| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 0of 0 votes

AnswersGiven a stream of integers, a value k and a value w, consider the integers in the window w and chop off greater k and smaller k elements from the window w. From the remaining elements, compute the average.

- neer.1304 July 03, 2019 in United States| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 0of 0 votes

AnswersImplement the version control map system which takes the snapshot of the versions of data. Implement the following functions:

- neer.1304 July 03, 2019 in United States

put(key, value) -> puts the value again the key in the latest version of the map

get(key) -> get the value of the key for the latest version of the data

snapshot() -> take a snapshot and increment the version

getValVersion(version id, key) -> return value of the key of the particular version| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 0of 0 votes

AnswerGiven various subsequences of an array, print the overall array:

- neer.1304 July 03, 2019 in United States

Example: [1, 3, 5], [1, 3, 9], [9, 5]

Array : [1, 3, 9, 5]| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 0of 0 votes

AnswerA graph has N vertices numbered from 1 to N. We have two lists. One list M consisted of edges between vertices. The other list K consists of restricted paths. We have to add edges one by one from M and check whether the addition of the particular edge leads to a path between the restricted edges given in K. If it creates a path, we have to discard the edge.

- neer.1304 July 03, 2019 in United States

Example: N = 4; K = {(1, 4)}; M = {(1, 2), (2, 3), (3, 4)}. Here, addition of edge (3, 4) will create a path between 1 and 4. Hence we discard edge (3, 4)| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 0of 0 votes

AnswersYou are given 2 strings which are exactly same but 1 string has an extra character. Find that character.

- neer.1304 July 03, 2019 in United States| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 0of 0 votes

AnswerYou are given an array of million numbers and provided a range of index (say left, right). For multiple queries, each with input left and right indexes, output the maximum in that range.

- neer.1304 July 03, 2019 in United States| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 0of 0 votes

AnswersGiven (x, y) coordinates, create a function such that each coordinate is uniquely mapped to an integer. Also make sure that given an integer, you should be able to find (x, y) coordinates. So F(x, y) = z and also that inverse F(z) = (x, y).

- neer.1304 July 03, 2019 in United States| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 1of 1 vote

AnswerWe have to paint n boards of length {A1, A2…An}. There are k painters available and each takes 1 unit time to paint 1 unit of board. The problem is to find the minimum time to get

- neer.1304 July 03, 2019 in United States

this job done under the constraints that any painter will only paint continuous sections of boards, say board {2, 3, 4} or only board {1} or nothing but not board {2, 4, 5}.

Input : k = 2, A = {10, 10, 10, 10}

Output : 20.

Here we can divide the boards into 2

equal sized partitions, so each painter

gets 20 units of board and the total

time taken is 20.

Input : k = 2, A = {10, 20, 30, 40}

Output : 60.

Here we can divide first 3 boards for

one painter and the last board for

second painter.| Report Duplicate | Flag | PURGE

Google Software Engineer Algorithm - 0of 0 votes

AnswersSteps to get out of complete binary tree

- bibhuprasadpala107 July 02, 2019 in India

You are given two integers A and B. A describes the number of nodes in complete binary tree.

You are B steps away from your destination in the worst case.

Initially, you can be at:

The root node of the tree and can only move bottom of the tree.

Any leaf node of the tree and can only move up the tree.

Find and return an array of integers C of size 2

where

C[0]: The number of nodes which are at B steps from the root, i.e. the number of nodes such that,

starting at that root, you have to take

B steps downwards to reach the node.

C[1]: The number of nodes such that the maximum distance from the node to any leaf in the subtree of the node is B.| Report Duplicate | Flag | PURGE

xyz SDE1 - 0of 0 votes

AnswersGeneral issues related to AOL email

- dpkshrma24612 July 02, 2019 in United States

AOL email customers report these issues to the particular assistance gathering to fix it.

Dismissal username and mystery state.

Bungle to send or get messages.

Email server down.

Particular goof to import email contacts.

Particular insufficiency to synchronize various messages.

Foundation issue with AOL email application.

Bungle in the midst of web setting.

Unfit to clear history or treats of messages.

These all issues can be lit up by its specific assistance bunch by methods for dial AOL Tech Support Number +1-844-446-0270. The organization of customer support is always reachable for all customers, thusly, customers can get in touch with them at whatever point they anticipated that help should separate their worry.| Report Duplicate | Flag | PURGE

A9 Analyst - 0of 0 votes

AnswersGiven two numbers m and n. Find all numbers between these two numbers such that difference between adjacent digit is 1

- neer.1304 July 01, 2019 in United States

For ex m =0 n =22

O/p - 0,1,2,3,4,5,6,7,8,9,10,12,21| Report Duplicate | Flag | PURGE

Amazon SDE-2 Algorithm - 0of 0 votes

AnswersFind 'k' largest element in stream of integers.

- neer.1304 July 01, 2019 in United States

Constraints -

1) k can vary for every query

2) Stream can not be stored| Report Duplicate | Flag | PURGE

Visa Staff Engineer design - 1of 1 vote

AnswersGet the sum of all prime numbers up to N. primeSum(N).

- acoding167 July 01, 2019 in United States

Follow-up: If primeSum(N) is frequently called, how to optimize it.| Report Duplicate | Flag | PURGE

Amazon - 0of 0 votes

AnswersN number of balloons are kept at different heights. You are asked to find out number of arrows to burst them. When an arrow hits the balloon it goes one level down.

- Raj June 27, 2019 in United States

Assume that the balloons are having same size.

for example given the balloons heights as array(Array will be given in decreasing order of size) :

5 4 3 3 2 2 1 1 1

minimum number of arrows to shoot them is: 3

explanation:

using first arrow shoot: 5 4 3 2 1

using second arrow shoot: 3 2 1

using third arrow shoot: 1

Example 2:

5 4 2 1

minimum number of arrows to shoot them is: 2

using first arrow shoot: 5 4

using second arrow shoot: 2 1

Expecting the solution to be in O(1) space complexity.| Report Duplicate | Flag | PURGE

Walmart Labs Java Developer Algorithm - 0of 0 votes

AnswersIn a garden, there are several apples trees planted in a grid format. Each point (i,j) in the grid has |i| + |j| apples.

Allie can buy a square plot centred at (0,0). Find the minimum perimeter of the plot (1 unit having length = 1) such that she can collect at

least X apples. All plants on the perimeter of the plot are also included.

Sample:

- bertram_gilfoyle June 27, 2019 in India`Input = 1 Output = 8 input = 11 Output = 8 Input = 13 Output = 16`

| Report Duplicate | Flag | PURGE

Amazon SDE1 Algorithm - 0of 0 votes

AnswersYou are required to collect N numbers from a bag. Initially, the bag is empty. Whenever you put a number X in the bag, then the owner of the bag asks the question.

- Sameer June 21, 2019 in United States

The questions are as follows:

. What is the greatest integer that is smaller than X and present inside the bag?

. What is the smallest number that is greater than X and present inside the bag?

If you answer both the questions correctly, then you can put X inside the bag. Your task is to answers the questions that are asked by the owner of the bag. If no such numbers exist in the bag print -1.

Example:

5 (Number of elements in the bag)

1

4

2

3

7

output:

-1 -1

1 -1

1 4

2 4

4 -1| Report Duplicate | Flag | PURGE

Amazon Java Developer Data Structures

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