PolicyBazaar Software Developer Intern Interview Questions and Answers

Graphs ,arrays , Hashmaps and Heaps

Q1. Graphs related dfs
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Q2. Changes on graph structure
Ans. 
Changes on graph structure involve adding, removing, or modifying nodes and edges.
• Adding a new node to the graph

• Removing an existing node from the graph

• Modifying the weight of an edge in the graph
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Q1. Design parking lot app
Ans. 
A parking lot app to help users find available parking spots and pay for parking.
• Include a map feature to show available parking spots in real-time

• Allow users to reserve parking spots in advance

• Integrate payment options for users to pay for parking

• Provide notifications for parking expiration or availability of nearby spots
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Q2. Design parking lot app for blind people
Ans. 
A parking lot app designed for blind people to easily navigate and find available parking spots.
• Include voice-guided navigation to direct users to available parking spots

• Use sensors to detect empty parking spaces and relay information to the app

• Provide audio alerts for obstacles or other vehicles in the parking lot

• Include a feature for users to easily locate their parked vehicle when returning
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This round had first questions about behavior, team work and hr type mcq questions.
Then there were 10 computer science mcqs. Then two coding questions.

Q1. This was of 1 hour. He asked about 2-3 dsa questions and some hr questions in last part.
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Q1. This was also a similar round like round 2. In this he asked 2 medium dsa questions and some hr questions at last.
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Easy Questions- Can be done with decent practice

Q1. Array question - basic knowledge sufficient
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Q2. Maths questions + stack implementation
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Round duration - 90 minutes
Round difficulty - Easy

This round had 2 coding problems and we had to code it on hackerearth only.
The use of Outside IDE was forbidden.
The timing of test was 12:00 PM to 1:30 PM.

Q1. 
Meeting Rescheduling Challenge
Ninja is tasked with organizing a meeting in an office that starts at time ‘0’ and ends at time ‘LAST’. There are ‘N’ presentations scheduled with given start and end times....read more
Ans. Brute Force Approach
Algorithm:
 
• The idea here is to find the maximum sum subarray of size ‘K+1’, where the array will contain empty slots.
• First, we create an array named emptySlots[], to store the time duration in which there is no presentation.
• Run a loop to traverse all presentations, and in each iteration, add START[i] - END[i-1] (which gives a free slot between the ith presentation) into the array emptySlots[].
• N...read more
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Q2. 
Total Unique Paths Problem Statement
You are located at point ‘A’, the top-left corner of an M x N matrix, and your target is point ‘B’, the bottom-right corner of the same matrix. Your task is to calcula...read more
Ans. Recursive Approach
We can easily count the total number of paths by making a recursive algorithm.
 
The steps are as follows:
 
1. We are given a function UNIQUEPATHS(), which takes two integers ‘M’ and ‘N’ as parameters and returns a single integer. This will be the definition of our recursive function too.
2. As our base condition, we will check if our number of rows (‘M’) or a number of columns (‘N’) is equal to 1. If...read more
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Round duration - 90 minutes
Round difficulty - Medium

This round was coding round with discussion .
The interviewer tried to trick the questions and wanted to test how we respond if something is asked out of preparation.
The code we ran on Google Docs was checked on Online IDE if it ran for sample inputs.
Timing : 12:00 PM to 1:30 PM

Q1. 
Minimum Operations to Connect a Graph
You are given a graph with 'N' vertices labeled from 1 to 'N' and 'M' edges. In one operation, you can shift an edge from being between two directly connected vertice...read more
Ans. Breadth First Search.
For a graph with ‘N’ vertices to be connected, there must be at least ‘N’ - 1 edges in the graph. If a graph has less than ‘N' - 1 edges it is impossible to make the graph connected. Otherwise, it is always possible to make graph connected. As we need to find the minimum number of operations to make the graph connected we will think greedily. We will find the total number of connected components in...read more
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Q2. 
Snake and Ladder Problem Statement
Given a 'Snake and Ladder' board with N rows and N columns, where positions are numbered from 1 to (N*N) starting from the bottom left, alternating direction each row, f...read more
Ans. BFS
We will use Breadth-First Search to find the shortest path from cellNumber 1 to cellNumber N*N.
1. We will maintain a queue of cellNumber where the front of the queue will always contain a cell which can be reached by minimum dice throw from starting cell (cellNumber = 1).
2. Create a minDiceThrow array of size N*N initialise it with the maximum value (INT_MAX)
3. Start with pushing cellNumber 1 and updating minDiceThrow[1] = 0...read more
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Round duration - 75 minutes
Round difficulty - Hard

This was a problem solving round and lasted for 75 minutes. The interviewer gave me a very complicated question.
The round was held on Google Meet and I was supposed to tell him the approach and write code on shared Google Docs.

Q1. 
XOR Query Problem Statement
Assume you initially have an empty array called ARR. You are required to return the updated array after executing Q number of queries on this array.
There are two types of que...read more
Ans. Brute Force
Approach:
• It is a brute force approach where we will create an empty array initially of size 10^5 + 1.
• Now, whenever we have a query of type 1 we will insert the value of VAL in the array. And when the query of type 2 comes then we will iterate through our array and perform an XOR operation with VAL to every value present in our array.
• Finally, we will return our array.
 
Algorithm:
• Create an array ans.
• Now it...read more
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Q1. Valid BT or not
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Q2. Make complete row and column zero in a matrix for each element that is already 0
Ans. 
Use a two-pass approach to mark rows and columns with zeros based on existing zeros in the matrix.
• Iterate through the matrix to mark rows and columns with zeros based on existing zeros

• Use two arrays to keep track of which rows and columns need to be zeroed out

• Perform a second pass to update the matrix based on the marked rows and columns
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Similar to Round 1 but more hard questions