## SDE-2 Interview Questions

- 0of 0 votes

AnswersYou are given a set of N horizontal lines which are connected by equal number of vertical lines to form squares of size 1x1. Now some segments are removed. You need to count the number of squares of all sizes (1x1, 2x2, ..., NxN) with all sides present.

- imunique August 30, 2017 in India

Image : https://he-s3.s3.amazonaws.com/media/uploads/1ce3516.png

In the above example you see four horizontal and vertical lines and few missing segments. Now you need to count the number of squares of all sizes with all sides.

Input :

First line is a positive integer N, number of horizontal and vertical lines.

Second line is positive integer M, number of segments removed.

Then there are m lines, each containing V,i,j or H,i,j where i and j are positive integers. H,i,j indicates a horizontal missing segment in the ith horizontal line between the jth and (j+1)th point on the line. V,i,j represents a gap in ith vertical line between the jth and (j+1)th point on the line.

Output :

Is the total number of squares in the figure with all sides along the remaining lines in the figure.

Sample Input :

4

4

H,2,1

H,3,1

V,2,2

V,2,3

Output :

5

Explanation : Here in this figure we have 4 squares of size 1x1 and 1 square of size 3x3, hence total is 5.| Report Duplicate | Flag | PURGE

Amazon SDE-2 Algorithm Data Structures Dynamic Programming Online Test Problem Solving - -1of 1 vote

AnswersIn a Kafka configuration, the same message is getting replayed to the consumer again n again.This is happening under heavy load otherwise it's fine.What can be possible causes?

- koustav.adorable August 30, 2017 in United States| Report Duplicate | Flag | PURGE

Spotify SDE-2 Distributed Computing - 0of 0 votes

AnswersGiven data of millions of people, (name, age, M/F etc.) Develop an API that will have age range as input and yield the count of people under this range as output.

- neer.1304 August 30, 2017 in United States| Report Duplicate | Flag | PURGE

Amazon SDE-2 Algorithm - 1of 1 vote

AnswerA T20 match is going on. You’re in Team B. First innings is over, they have scored “teamARuns” runs. Your team has scored “teamBRuns” runs at the end of “balls” balls. A ball can have multiple possibilities like [0, 1, 2, 3, 4, 5, 6, Wicket, No ball, Wide ball]. What is the probability that your team (Team B) will win?

- neer.1304 August 30, 2017 in United States| Report Duplicate | Flag | PURGE

Amazon SDE-2 Algorithm - 0of 0 votes

AnswersGiven a dictionary of words and a string pattern. Output the count of words that match the string pattern in the dictionary.

- neer.1304 August 30, 2017 in United States

Eg. Dictionary: [cat, rat, mat, apple, boy, bat]

String pattern: ?at

Output: 4 (because cat, rat, mat, bat matches the string pattern)| Report Duplicate | Flag | PURGE

Amazon SDE-2 Algorithm - 0of 0 votes

AnswersGiven any two nodes in a binary tree, find the path from 1st node to another, and tell if the path is a straight line, or there are turns on the line, find number of turns.

- neer.1304 August 30, 2017 in United States| Report Duplicate | Flag | PURGE

Amazon SDE-2 Algorithm - 0of 0 votes

AnswersFind the maximum difference between any combination of child and parent node in a given binary tree. Here child node can be any level below parent node, but should be in the same sub tree starting from parent node.

- neer.1304 August 30, 2017 in United States| Report Duplicate | Flag | PURGE

Amazon SDE-2 Algorithm - 1of 1 vote

AnswersDesign Truecaller. Both HLD and LLD.

- neer.1304 August 30, 2017 in United States| Report Duplicate | Flag | PURGE

Amazon SDE-2 design - 0of 0 votes

AnswersGiven a chessboard, find minimum number of moves for a knight to reach from source to destination.

- neer.1304 August 30, 2017 in United States| Report Duplicate | Flag | PURGE

Amazon SDE-2 Algorithm - 0of 0 votes

AnswerGiven a fully connected graph with n nodes and corresponding values. One node can interact with other node at a time, to replace/ignore/add its value to other node’s value. Assuming this operation takes 1 unit of time, how much time would it take for all the nodes to have value equal to sum of all the nodes.

- neer.1304 August 30, 2017 in United States

Examples : Given a graph with values {1,2,3,4}, find total time it takes, such that all nodes have value as 10.| Report Duplicate | Flag | PURGE

Amazon SDE-2 Algorithm - 1of 1 vote

AnswersGiven a Singly Linked list, Update the second half of the list such that n-th element becomes sum(1st + nth) element, (n-1)st element becomes sum(2nd + n-1st) element and so on. Eg: 2->3->4->5->6 => 2->3->(4+4)->(5+3)->(6+2)

- neer.1304 August 30, 2017 in United States| Report Duplicate | Flag | PURGE

Amazon SDE-2 Algorithm - 1of 1 vote

AnswersImplement a queue using only one stack.

- neer.1304 August 30, 2017 in United States| Report Duplicate | Flag | PURGE

Microsoft SDE-2 Algorithm - 0of 0 votes

AnswersIt’s a two player game. Both the players are equally intelligent to win the game. Give n no. of stones. A player can choose either 1 stone or k stones or l stone (1<k<l). Suppose player 'A' starts game then challenge was to identify the player who will win the game. Player who picks the last 1 stone or last k stone or last l stones win the game.

- neer.1304 August 30, 2017 in United States| Report Duplicate | Flag | PURGE

Microsoft SDE-2 Algorithm - 0of 0 votes

AnswerDesign bus booking system:- Each row has x seat. If customer wants K seats if you have K consecutive seats available, reserve them. Otherwise give seats from any row.

- neer.1304 August 30, 2017 in United States| Report Duplicate | Flag | PURGE

Microsoft SDE-2 Algorithm - 0of 0 votes

AnswersThere is a bridge and N no. people takes (a1,a2,—an) time to cross it and there are K torch and at any time x no of people can pass the bridge and it takes maximum of x people time to cross it. Minimum time required for N persons to cross the bridge.

- neer.1304 August 30, 2017 in United States| Report Duplicate | Flag | PURGE

Microsoft SDE-2 Algorithm - 0of 0 votes

AnswerThere is a graph where each node represents a city and it contains specific no. of people. A tournament is going on and each match is playing in one city. All city’s people gather to watch match. Traffic department wants to manage how many people travel through city x if match is playing in city y for each x. City x and y can be any city.

- neer.1304 August 30, 2017 in United States| Report Duplicate | Flag | PURGE

Microsoft SDE-2 Algorithm - 0of 0 votes

AnswersGiven an Infinite stream of strings as AAAAABBBCCDDDEEE… How will you arrange characters so that string become unique without duplicates .

- neer.1304 August 30, 2017 in United States

Return true if it is possible to arrange else return -1.

Ex . AAABBCCDEF – O/p ABABCDCEF : Possible . AAAAAAAAAAAAAAAAAAAAAAB : Not possible| Report Duplicate | Flag | PURGE

Amazon SDE-2 Algorithm - 0of 0 votes

AnswersGiven an array of integers, replace every number with the next higher number to its right. If a number can’t be replaced, we leave it as-it is.

- neer.1304 August 30, 2017 in United States

For example, the list: 5, 2, 1, 4, 6, 7 needs to be changed to 6, 4, 4, 6, 7, 7.| Report Duplicate | Flag | PURGE

Amazon SDE-2 Algorithm - 0of 0 votes

AnswersGiven two unsorted arrays A, B. They can contain duplicates. For each element in A count elements less than or equal to it in array B

- neer.1304 August 30, 2017 in United States

Examples:

Input : A = [1, 2, 3, 4, 7, 9]

B = [0, 1, 2, 1, 1, 4]

Output : [4, 5, 5, 6, 6, 6]| Report Duplicate | Flag | PURGE

Amazon SDE-2 Algorithm - -1of 1 vote

AnswerHow do I design a Payment Gateway system? What are the things to consider in this design ?

- koustav.adorable August 28, 2017 in United States| Report Duplicate | Flag | PURGE

Facebook SDE-2 System Design - 1of 1 vote

AnswersWAP to Convert Hex String to Equivalent decimal Integer.

- hprem991 August 23, 2017 in United States| Report Duplicate | Flag | PURGE

SDE-2 - -1of 1 vote

AnswersGiven a matrix. Convert it into a linked list matrix such that each node is connected to its next right and down node.

Ex:

1 2 3

4 5 6

7 8 9

Output:

1->2->3->NULL

| | |

v v v

4->5->6->NULL

| | |

v v v

7->8->9->NULL

| | |

v v v

--NULL-

This is my code.`class Ideone { public static void main(String args[]) throws Exception { int arr[][] = { { 1, 2, 3 }, { 4, 5, 6 } }; LList op = convert2DArrintoList(arr, 0, 0); System.out.println(op); } public static LList convert2DArrintoList(int arr[][], int col, int row) { if (col >= arr[0].length || row >= arr.length) return null; return new LList(arr[row][col], convert2DArrintoList(arr, col, row + 1), convert2DArrintoList(arr, col + 1, row)); } static class LList { LList(int data) { this.data = data; } LList(int data, LList down, LList next) { this.data = data; this.down = down; this.next = next; } LList() { this.data = Integer.MAX_VALUE; } @Override public String toString() { return " " + this.data + " "; } int data; LList next; LList prev; LList rand; LList down; } }`

Are there better ways of doing it?

- koustav.adorable August 16, 2017 in United States| Report Duplicate | Flag | PURGE

Amazon SDE-2 Algorithm - -1of 1 vote

AnswersGiven a fully connected graph with n nodes and corresponding values. One node can interact with other node at a time, to replace/ignore/add its value to other node’s value. Assuming this operation takes 1 unit of time, how much time would it take for all the nodes to have value equal to sum of all the nodes.

- koustav.adorable August 14, 2017 in United States

Examples : Given a graph with values {1,2,3,4}, find total time it takes, such that all nodes have value as 10.

I am assuming it can be done in O(N).It will take basically two traversals, one for calculating the sum of values of nodes(first traversal), other for replacing the value of the nodes(second traversal).

It will take 2*(no of nodes) time.

Are there any better ways possible ?| Report Duplicate | Flag | PURGE

Amazon SDE-2 Data Structures - 0of 0 votes

AnswersDesign amazon's frequently viewed product page.

- Nascent August 11, 2017 in India| Report Duplicate | Flag | PURGE

Amazon SDE-2 - 0of 0 votes

AnswersDesign a ESPN like system. Ensure scaling and availability. Also one should get all details like score of a player, no. of mtches etc.

- Nascent August 11, 2017 in India| Report Duplicate | Flag | PURGE

Amazon SDE-2 - -1of 1 vote

Answerscount number of combinations which are not possible.

- bit32413 August 05, 2017 in United States

There are 'n' empty slots.

A slot can be filled with 'O', 'E', or 'X'

A combination is possible if

1. 'O' s are placed in odd slot , 'E' a are placed in even slots.

2. 'O' and 'E' alternate among them,

i.e (OXOE) not allowed because between O s there is no 'E'; but (OEXXO) is allowed.

some allowed combinations

OEXXX, XXOEO, OXXEX

For 3 slots, not allowed combinations are

OXX

XXO

XEX

XXX

OXO

Only those combinations are considered in which O s and E s are in their respective odd and even slots.

i.e EEXXX will never be considered because a 'E' is in odd slot

A combination isn't allowed if 'O' is not followed by 'E' or vice versa| Report Duplicate | Flag | PURGE

Google SDE-2 Algorithm - 2of 2 votes

AnswersDesign a FIDS(Flight Information Display System)

- AD August 04, 2017 in India

1. Consider most important classes & ignore Interfaces as of now

2. FIDS is not about reservation system but the dasboard to display

3. the information will look like:

DEPARTURES

----------------------

Attributes:

STD Airline Flight Destination/Via CheckInCounter# Gate Status ETD

Values :

12:50 KingFisher 6E352 Hyderabad A-B 23 Check-In Open 13:15

ARRIVALS

-----------------------

Attributes:

STA Airline Flight# Destination/Via Gate Status ETA

Values :

12:50 KingFisher 6E352 UK/Mumbai Terminal2 Landed 13:15| Report Duplicate | Flag | PURGE

Amazon SDE-2 System Design - 0of 0 votes

AnswersWrite a C code matrix multiplication in such a way that the matrix can be read in row major form only

- anaghakr89 July 31, 2017 in United States for Touch system software| Report Duplicate | Flag | PURGE

Qualcomm SDE-2 - 2of 2 votes

AnswersDesign a mall where there are 'm' entry gates and 'n' exit gates. There can be only 'x' number of people inside it. No more then 'x' people can be inside mall at any time.

- neer.1304 July 30, 2017 in United States| Report Duplicate | Flag | PURGE

Microsoft SDE-2 Software Design - 0of 0 votes

AnswersHow will you design a true collar?

- Nascent July 27, 2017 in India| Report Duplicate | Flag | PURGE

Microsoft SDE-2

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