## Matrix Interview Questions

- 0of 0 votes

AnswersGiven the N*N matrix, find the given number in the matrix. All rows are sorted. And each row first element is less than the previous row last index.

- sarunreddy82 March 05, 2018 in United States

input :

[1,3,5,7,9]

[11,13,15,16,20]

[21,22,23,24,25]

[30,32,35,40,45]

Given Num : 23

What is the best Optimal solution ? I have used BST but the interviewer asked to use any other which could do better in the above scenario.| Report Duplicate | Flag | PURGE

xyz Developer Program Engineer Matrix - 0of 0 votes

AnswersGiven a Matrix A,

- GP700 May 15, 2017 in India

The rules for movement are as follows :

1. Can only move Right or Down from any element

2. Can only move within the row and column of element we start from intially.

3. You can only visit or cross an element if its value is lesser than the value of element you start from.

Find total number of elements one can visit, If one starts from an element A(i,j) where i-> row and j-> column.

Note : You have to print this output for each matrix element.

Input : Matrix

1 2 3

2 3 1

3 1 2

Output:

1 1 3

1 3 1

3 1 1| Report Duplicate | Flag | PURGE

Hackerrank Senior Software Development Engineer Data Structures Math & Computation Matrix - 0of 0 votes

AnswersQ 2. You are given a chess game board of size NxN. You have find out positions(i,j), where you can place N queens so that, none of the queens can kill each other without making their first move.

- sonesh April 28, 2017 in United States| Report Duplicate | Flag | PURGE

Hitachi Data Systems Software Engineer / Developer Algorithm Coding Dynamic Programming Matrix - 1of 1 vote

AnswersYou are given an island which contains cliffs of various heights. A water droplet is placed on one of the cliffs. The water droplet always flows from higher height to lower height. Write a program that can calculate the lowest height cliff in the island that the water droplet can reach in the most efficient way you can think of. Example: if the droplet is placed on a cliff of height 5 and it is surrounded by cliffs of heights 6,3,2,2; it can flow to either of the cliffs of height 3,2,2 and then further flow from there.

- Saad April 16, 2017| Report Duplicate | Flag | PURGE

Google Intern Matrix - 0of 0 votes

AnswersGiven an mXn Sorted matrix and a value X. Every row is sorted and first number of every row is greater than last number of previous row Find the value X in most efficient way.

- neelabhsingh January 18, 2017 in India for Hyderabad| Report Duplicate | Flag | PURGE

Amazon SDE-2 Matrix - 1of 1 vote

AnswersPrint elements of a matrix in spiral form.

- yasharonline January 12, 2017 in United States for Azure| Report Duplicate | Flag | PURGE

Microsoft SDE1 Matrix - 1of 1 vote

AnswersYou have a matrix that is sorted as such: For each value, every index to its right and below it must be larger than the current space's value. Likewise, all entries to its left and above it must be smaller than the current value. How would you go about searching this matrix for a specific number, given its sorted nature?

- oxymoronic2012 November 02, 2016 in United States for Bing| Report Duplicate | Flag | PURGE

Microsoft Software Engineer Intern Matrix - 0of 0 votes

AnswersGiven a 2D array of digits, try to find the occurrence of a given 2D pattern of digits. For example, consider the following 2D matrix:

- kohansey February 04, 2016 in United States

7283455864

6731158619

8988242643

3839505324

9509505813

3843845384

6473530293

7053106601

0834282956

4607924137

Assume we need to look for the following 2D pattern:

950

384

353| Report Duplicate | Flag | PURGE

Amazon Software Developer Matrix - 0of 0 votes

AnswersAllocate a 2-D array of size m*n using malloc(). The array should be accessible as a[i][j].

- Saurabh Singhal January 16, 2016 in India| Report Duplicate | Flag | PURGE

Arista Networks Software Engineer Arrays C Data Structures Matrix - 0of 0 votes

AnswersYou are tasked with defining and implementing a function. as input, you are given an n x m matrix. x may appear any number of times in a matrix. your function should modify thebmatrix such that any row and column where x originally appears are completely over written with x

- annu025 September 30, 2015 in United States

For example:

- - - - -

- - - - -

- - - x -

x - - - -

- - - - -

Expected output:

x - - x -

x - - x -

x x x x x

x x x x x

x - - x -| Report Duplicate | Flag | PURGE

Software Engineer / Developer Matrix - 0of 0 votes

AnswersWrite a function to print unique rows of a matrix.

- ritwik_pandey July 13, 2015 in India

I am thinking of a 0(n) solution for this (if possible).

I am storing the rows of the matrix in a set of vectors and then printing those rows. Please tell me how to do this and the correct time complexity for that. I am not very good with STL.| Report Duplicate | Flag | PURGE

Amazon Software Engineer Matrix - -2of 2 votes

AnswersRound 4

- sonesh July 12, 2015 in United States

Question 5 : Question 5 : Do you know A/B testing ?, when we tell you some result of an experiment, how do you know the results are accurate ?, actually this question was about the statistics, he asked me many questions to check my statistics knowledge ?| Report Duplicate | Flag | PURGE

Microsoft Software Engineer / Developer Brain Storming Data Mining Math & Computation Matrix Probability Testing - 1of 1 vote

AnswersThe Mingo game:

- ram March 10, 2015 in United States

The game of Mingo involves a 100 X 100 board with unique positive whole numbers in the range from 1 to 1,000,000 randomly distributed in the cells. Unique numbers are "called" one at a time and the goal is to have a "Mingo", which is an entire row or column of cells with numbers that have been called; one might also form a diagonal from corner to corner with numbers that have been called. Write a function that takes as parameters a square array of 100 X 100 positive whole numbers and list of "called" numbers. Your function will report whether a "Mingo" occurs, and after how many called numbers the first Mingo occurs. You may assume valid input.| Report Duplicate | Flag | PURGE

Epic Systems Software Developer Matrix - 0of 0 votes

AnswersWrite a utility function that takes the starting position (P0) and length (L0) of one line segment plus the start position (P1) and length (L1) of a second line segment and returns the configurations where both segments end at the same point. Both starting points can be anywhere in three dimensional space.

- GameDev33 February 09, 2015 in United States| Report Duplicate | Flag | PURGE

Software Engineer Algorithm C++ Math & Computation Matrix - 0of 0 votes

AnswersA 2D matrix is given to you. Now user will give 2 positions (x1,y1) and (x2,y2),

- Ankit Tripathi December 23, 2014 in India

which is basically the upper left and lower right coordinate of a rectangle formed within the matrix.

You have to print sum of all the elements within the area of rectangle in O(1) running time.

Now you can do any pre computation with the matrix.

But when it is done you should answer all your queries in constant time.

Example : consider this 2D matrix

1 3 5 1 8

8 3 5 3 7

6 3 9 6 0

Now consider 2 points given by user (0, 2) and (2, 4).

Your solution should print: 44.

i.e., the enclosed area is

5 1 8

5 3 7

9 6 0| Report Duplicate | Flag | PURGE

Snapdeal SDE1 Matrix - 0of 0 votes

AnswersGiven is a matrix arr[n][n], find a submatrix sub[m][m] such summation of all the elements in submatrix is maximum.

- nav July 13, 2014 in India

Given condition,

1. m <= n

2. m >= 2

3. consider positive, negavive and zero integers in arr[n][n]

4. User provide n.| Report Duplicate | Flag | PURGE

Software Engineer / Developer Matrix - 2of 4 votes

AnswersSearch in a row wise and column wise sorted matrix

- vinod January 24, 2014 in India| Report Duplicate | Flag | PURGE

Amazon Intern Matrix - 1of 1 vote

Answers

- Srigopal Chitrapu January 15, 2014 in United States`In given array find zero and replace the entire row and column with zeros E.g Input: 1 2 3 4 5 6 7 8 9 10 0 11 12 13 14 15 Output: 1 2 0 4 5 6 0 8 0 0 0 0 12 13 0 15`

| Report Duplicate | Flag | PURGE

Microsoft SDE-2 Arrays Coding Matrix - 0of 0 votes

AnswersWrite a code to read and write a matrix in below given way.

- naggarwal11 October 26, 2013 in India

Note : no. indicates the sequence here.

I/P

1 2 3

4 5 6

7 8 9

O/P

1 6 7

2 5 8

3 4 9| Report Duplicate | Flag | PURGE

Matrix - 2of 2 votes

AnswersGiven an n x n matrix A(i,j) of integers, find maximum value A(c,d) - A(a,b) over all choices of indexes such that both c > a and d > b.

- vik October 07, 2013 in United States

Required complexity: O(n^2)| Report Duplicate | Flag | PURGE

Amazon SDE1 Algorithm Arrays Data Structures Ideas Matrix - 1of 1 vote

AnswersString [] [] matrix = {{"A","N", "L", "Y", "S"},{"I", "S", "D", "E", "S"},{"I", "G", "N", "D", "E"}};

- gohilumesh July 05, 2013 in United States

// 2. Given a word "DES"

// 3. Write a program to find the occurences of this word "DES". Letters must be next to each other in the matric.

// 4. "Next" means: left, right, up, down, left down, right down, upper left, upper right

// 5.. For example: S at (1,1): A, N, L, D, N, G, I, I are next to S at (1,1)

Required output

// // D - [1, 2], E - [1, 3], S- [1, 4]

// D - [1, 2], E - [1, 3], S- [0, 4]

// D - [2, 3], E - [2, 4], S - [1, 4]

// D - [2, 3], E - [1, 3], S - [0, 4]

// D - [2, 3], E - [1, 3], S - [1, 4]| Report Duplicate | Flag | PURGE

Amazon SDE1 Matrix - 2of 2 votes

AnswersGiven an NxM (N rows and M columns) integer matrix with non-negative values (0..MAX_INT inclusive). What is the maximum sum from going top left (0, 0) to bottom right (N-1, M-1) ? The condition is that when you're at point (p, q), you can only move to either right (p, q+1) or down (p+1, q).

- math.matt July 03, 2013 in United States

Expected time complexity O(N*M)

Expected space complexity O(N+M)

From the space complexity it looks like there is a DP solution, but I couldn't figure it out.| Report Duplicate | Flag | PURGE

Samsung Java Developer Matrix - 0of 0 votes

AnswersThere is a binary tree of size N. All nodes are numbered between 1-N(inclusive). There is a N*N integer matrix Arr[N][N], all elements are initialized to zero. So for all the nodes A and B, put Arr[A][B] = 1 if A is an ancestor of B (NOT just the immediate ancestor).

- Vin May 26, 2013 in India| Report Duplicate | Flag | PURGE

Amazon Software Engineer / Developer Matrix - 0of 0 votes

AnswersWe are given a matrix of MxN elements with each element either being 0 or 1.Find the shortest path between a given source cell to a destination cell.

- beginner99 January 22, 2013 in India

An element value of 0 means we cannot create a path out of that cell| Report Duplicate | Flag | PURGE

Amazon Software Engineer / Developer Algorithm Amazon Arrays Matrix - -1of 1 vote

AnswersConsider there are n matrices. For eg, A, B, C and D are four matrices. Find the groupings of matrices during their product, the operations involved in your choice of grouping is minimal.

- sivaji8 October 30, 2012 in United States

For eg, you can group like (AB)CD or (ABC)D or A(BC)D or A(BCD) .... But among these options in which grouping the operations of matrix multiplication will be minimal. Remember in matrix multiplication , multiplication and sum of elements are involved.| Report Duplicate | Flag | PURGE

Amazon Software Engineer / Developer Matrix - 0of 0 votes

AnswersGiven a matrix of 0's and 1's find the number of groups of 1's in the matrix.

- smdmustaffa October 30, 2012 in United States

A group of 1's can be formed if a 1 is present either vertically or horizontally to the adjacent 1 and not diagonally.

1 0 0 0

1 1 0 0

0 0 1 1

0 0 1 1

The above matrix has two groups of 1's while the one shown here has only one group

1 1 0 0

1 1 1 0

1 1 0 0

No restrictions on space complexity was given but the interviewer did mention that the time complexity should be efficient and that it should work for extremely large matrix's as well.| Report Duplicate | Flag | PURGE

Software Engineer / Developer Algorithm Data Structures Java Matrix - 0of 0 votes

Answersgiven m x n matrix print all the possible paths top to down.

- junk.programmer October 17, 2012 in United States

Example

1 2 3

4 5 6

7 8 9

path for root(0,0) 1

1-4-7

1-4-8

1-5-7

1-5-8

1-5-9

similarly path for 2(0,1)

2-4-7

2-4-8

2-5-7

2-5-8

2-5-9

2-6-8

2-6-9

note- root 1 can go to middle down or right down since there is no left index available. if root element has left middle and right it can go to all those paths like 2 or 5.

follow up : provide the path which has maximum path sum.

code in java.| Report Duplicate | Flag | PURGE

Yahoo Computer Scientist Matrix - 0of 0 votes

AnswersGiven a m * n matrix and value k. Find k * k matrix within the given matrix whose sum is maximum.

- grave August 12, 2012 in India| Report Duplicate | Flag | PURGE

Amazon Software Engineer / Developer Algorithm Matrix - 0of 0 votes

AnswersSearch a number in a large square but sorted matrix. Since the matrix can be very large, keep algorithmic efficiency in mind.

- edoc0code August 08, 2012 in United States| Report Duplicate | Flag | PURGE

Shutterfly Software Engineer / Developer Matrix - 0of 0 votes

Answers"Min(Max elements rows) not less than Max(Min of columns)"

- prince August 01, 2012 in India

can you tell me whether above statement ist true or false..

if it true, then tell me solutoin.

if it false, then tell me example| Report Duplicate | Flag | PURGE

Google Software Engineer / Developer Matrix

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