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Practo Software Developer Interview Questions, Process, and Tips
Top Practo Software Developer Interview Questions and Answers
- Q1. Intersection of Two Unsorted Arrays Problem Statement Given two integer arrays ARR1 and ARR2 of sizes 'N' and 'M' respectively, find the intersection of these arrays. Th ...read more
- Q2. Rotting Oranges Problem Statement You are given a grid containing oranges where each cell of the grid can contain one of the three integer values: 0 - representing an em ...read more
- Q3. Power of 2 Problem Statement Determine if it is possible to reorder the digits of a given integer 'N' such that the resulting number is a power of two. The leading digit ...read more
Practo Software Developer Interview Experiences
5 interviews found
Interview Questionnaire
9 Questions
- Q1. What is event bubbling?
- Ans.
Event bubbling is the propagation of an event from the innermost child element to the outermost parent element.
Events triggered on a child element will also trigger on its parent elements
The event travels up the DOM tree until it reaches the document object
Can be stopped using event.stopPropagation()
Can be useful for event delegation
- Q2. Difference between .on(‘click’,function() and .click(function())
- Ans.
The .on('click',function() is a more flexible method than .click(function())
The .on() method can handle multiple events and selectors
The .click() method can only handle one event and one selector
The .on() method can also handle dynamically added elements
The .click() method cannot handle dynamically added elements
- Q3. Write a function to check if two strings are anagram or not
- Ans.
Function to check if two strings are anagram or not
Create two character arrays from the strings
Sort the arrays
Compare the sorted arrays
- Q4. Given an array of integers which can be in one of four order – i.Increasing 2.Decreasing 3.decreasing then increasing 4.increasing then decreasing .Write a function to find the type of array
- Ans.
Function to determine the order of integers in an array.
Check first and last element to determine if increasing or decreasing
Check for inflection point to determine if order changes
Return order type as string
- Q5. How can you improve the performance of a site.(Only frontend)
- Ans.
Optimize images, minify code, reduce HTTP requests, use caching, and lazy loading.
Optimize images using compression and appropriate file formats
Minify code to reduce file size and improve load times
Reduce HTTP requests by combining files and using sprites
Use caching to store frequently accessed data locally
Implement lazy loading to defer loading of non-critical resources
- Q6. Design database schema for a movie site.Where user can watch the movie,genre of movie,give ratings and recommended movies to user.Also Write an algorithm to show recommended movies to user
- Ans.
Design a database schema for a movie site with user ratings and recommendations.
Create tables for movies, users, ratings, and recommendations
Use foreign keys to link tables
Include columns for movie genre and user watch history
Algorithm for recommendations can use user watch history and ratings to suggest similar movies
- Q7. By tossing a coin we can get either head or tail, i have a function toss() which return head or tail with equal probability
- Q8. You have to write a function for dice which will return number from 1-6 with equal probability. constraints : you can not use random function, you can use only toss function
- Ans.
Function to simulate dice roll with equal probability without using random function
Use a toss function that returns either 0 or 1 with equal probability
Call the toss function 3 times and convert the result to a binary number
If the binary number is greater than 0 and less than or equal to 6, return it
If the binary number is greater than 6, repeat the process
- Q9. Write a query to fetch duplicate email from table?
- Ans.
Query to fetch duplicate email from table
Use GROUP BY and HAVING clause to filter out duplicates
SELECT email, COUNT(*) FROM table_name GROUP BY email HAVING COUNT(*) > 1;
This will return all the duplicate emails in the table
Interview Preparation Tips
College Name: na
Motivation: Practo is the market leader in digital healthcare management with millions of consumers using our products to find doctors, book appointments and manage their healthcare efficiently. Practo Ray is the platform of choice for the vast majority of doctors and clinics deploying cloud based clinic management solution.I recently got an offer from Practo, here is my interview experience:
Skills evaluated in this interview
I applied via LinkedIn and was interviewed in Jul 2024. There was 1 interview round.
Coding test based on Binary trees, String Manipulation
I was interviewed in Aug 2021.
(3 Questions)
Round duration - 90 minutes
Round difficulty - Medium
This round had 3 coding questions of Medium to Hard level of difficulty.
- Q1.
Intersection of Two Unsorted Arrays Problem Statement
Given two integer arrays
ARR1andARR2of sizes 'N' and 'M' respectively, find the intersection of these arrays. The intersection is defined as the se... - Ans.
Approach 1 (Using Hashing) :
1) Initialize an empty set hs.
2) Iterate through the first array and put every element of the first array in the set S.
3) For every element x of the second array, do the following :
Search x in the set hs. If x is present, then print it.
TC : O(N+M) under the assumption that hash table search and insert operations take O(1) time, here N=size of array
1 and M=size of array 2.
SC : O(min(N,M))
Appr... - Q2.
Ways To Make Coin Change
Given an infinite supply of coins of varying denominations, determine the total number of ways to make change for a specified value using these coins. If it's not possible to make...
- Ans.
This was a very standard DP problem and I had already solved it on platforms like LeetCode and CodeStudio so I
was able to come up with the logic and code it preety fast.
Steps :
1) Create a two-dimensional array, ‘dp’, where ‘dp[i][j]’ will denote the total number of ways to make j value by using i
coins.
2) Run 2 loops ,1st one from 1 to value and second one throught the array denominations.
3) Fill dp array by the recurre... - Q3.
Longest Substring Without Repeating Characters Problem Statement
Given a string
Sof lengthL, determine the length of the longest substring that contains no repeating characters.Example:
Input:
"abac...
- Ans.
Approach : I solved it using 2-pointers and keeping a track of the frequency of the elements encountered in a freq
array of size 26.
Steps :
1) Initiliase a freq array of size 26 where a=0, b=1 ...,z=25 .
2) Let s be our string and n = s.size()
3) Do , freq[s[0]]++;
4) Keep 2 pointers start and end where initially start=0 and end=1 also maintain a answer variable ans where initially
ans=0
5) Now run a loop till end=1 and start...
(4 Questions)
Round duration - 60 minutes
Round difficulty - Medium
This round started with 2 coding questions and then moved on to some more questions from OOPS.
- Q1.
Palindrome Linked List Problem Statement
You are provided with a singly linked list of integers. Your task is to determine whether the given singly linked list is a palindrome. Return
trueif it is a pali... - Ans.
Approach :
1) Recursively traverse the entire linked list to get the last node as a rightmost node.
2) When we return from the last recursion stack. We will be at the last node of the Linked List. Then the last node
value is compared with the first node value of Linked List.
3) In order to access the first node of Linked List, we create a global left pointer that points to the head of Linked List
initially that will be avai... - Q2.
Search Element in a Rotated Sorted Array
Given a sorted array that has been rotated, the task is to find the index of a specific element. The array is initially sorted in ascending order and then rotated ...
- Ans.
This was a preety standard Binary Search Question and I had solved this question before on platforms like LeetCode
and CodeStudio . I was asked this question to test my implementation skills and how well do I handle Edge Cases .
Approach :
1) The idea is to find the pivot point, divide the array in two sub-arrays and perform binary search.
2) The main idea for finding pivot is – for a sorted (in increasing order) and pivot... - Q3. What is a static variable in C?
- Ans.
1) Static variables are initialized only once.
2) The compiler persists with the variable till the end of the program.
3) Static variables can be defined inside or outside the function.
4) They are local to the block.
5) The default value of static variables is zero.
6) The static variables are alive till the execution of the program.
Here is the syntax of static variables in C language,
static datatype variable_name = value;
... - Q4. What is the difference between abstraction and inheritance?
- Ans.
The main difference between abstraction and inheritance is that abstraction allows hiding the internal details and displaying only the functionality to the users, while inheritance allows using properties and methods of an already existing class.
(4 Questions)
Round duration - 60 minutes
Round difficulty - Medium
This round had questions mainly from HTML,CSS and JavaScript as I had mentioned some Frontend Projects in my resume so the interviewer wanted to check my skills on those. He also asked me some SQL queries and a simple coding question towards the end of the interview.
- Q1. What is event bubbling in JavaScript?
- Ans.
Event bubbling is a method of event propagation in the HTML DOM API when an event is in an element inside another element, and both elements have registered a handle to that event. It is a process that starts with the element that triggered the event and then bubbles up to the containing elements in the hierarchy. In event bubbling, the event is first captured and handled by the innermost element and then propagated to...
- Q2. How can you optimize the loading of website assets?
- Ans.
To optimize website load time we need to optimize its asset loading and for that:
1) CDN hosting - A CDN or content delivery network is geographically distributed servers to help reduce latency.
2) File compression - This is a method that helps to reduce the size of an asset to reduce the data transfer
3) File concatenation - This reduces the number of HTTP calls
4) Minify scripts - This reduces the overall file size of js... - Q3. In how many ways can you display HTML elements?
- Ans.
1) inline: Using this we can display any block-level element as an inline element. The height and width attribute values of the element will not affect.
2) block: using this, we can display any inline element as a block-level element.
3) inline-block: This property is similar to inline, except by using the display as inline-block, we can actually format the element using height and width values.
4) flex: It displays... - Q4.
Check if Two Strings are Anagrams
Anagrams are words or names that can be formed by rearranging the letters of another word. For instance, 'spar' can be rearranged to form 'rasp', making them anagrams.
E...
- Ans.
Approach 1(Using Sorting) :
1) Sort both strings
2) Compare the sorted strings
TC : O(N*log(N)), where N = length of the string
SC : O(1)
Approach 2(Counting characters) :
1) Create count arrays of size 256 for both strings. Initialize all values in count arrays as 0.
2) Iterate through every character of both strings and increment the count of character in the corresponding count arrays.
3) Compare count arrays. I...
(2 Questions)
Round duration - 30 minutes
Round difficulty - Easy
This is a cultural fitment testing round. HR was very frank and asked standard questions. Then we discussed about my role.
- Q1. What is something about you that is not included in your resume?
- Ans.
If you get this question, it's an opportunity to choose the most compelling information to share that is not obvious from your resume.
Example :
Strength -> I believe that my greatest strength is the ability to solve problems quickly and efficiently, which makes me unique from others.
Ability to handle Pressure -> I enjoy working under pressure because I believe it helps me grow and become more efficient.
Tip : Empha... - Q2. Why should we hire you?
- Ans.
Tip 1 : The cross questioning can go intense some time, think before you speak.
Tip 2 : Be open minded and answer whatever you are thinking, in these rounds I feel it is important to have opinion.
Tip 3 : Context of questions can be switched, pay attention to the details. It is okay to ask questions in these round, like what are the projects currently the company is investing, which team you are mentoring. How all is the...
Interview Preparation Tips
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
Skills evaluated in this interview
I was interviewed before Apr 2021.
(3 Questions)
Round duration - 90 minutes
Round difficulty - Medium
This round had 3 coding questions of Medium to Hard level of difficulty.
- Q1.
Balanced Parentheses Combinations
Given an integer
Nrepresenting the number of pairs of parentheses, find all the possible combinations of balanced parentheses using the given number of pairs.Explanati...
- Ans.
Approach :
1) First make a recursive function, say ‘solve’ taking the number of opening brackets ‘opening’, number of closing
brackets ‘closing’ output string ‘output’, and an array of strings ‘ans’ as arguments.
2) Make the base condition as if ‘opening’ = 0 and ‘closing’ = 0 then push the output string in the ‘ans’ and return.
3) If ‘opening’ is not equal to zero then call the ‘solve’ function recursively by decrementing... - Q2.
Trapping Rain Water Problem Statement
You are given a long type array/list
ARRof sizeN, representing an elevation map. The valueARR[i]denotes the elevation of theithbar. Your task is to determine th... - Ans.
Approach 1 (Brute Force) :
1) Iterate over every elevation or element and find the maximum elevation on to the left and right of it. Say, the
maximum elevation on to the left of the current elevation or element that we are looking at is ‘maxLeftHeight’ and the
maximum elevation on to the right of it is ‘maxRightHeight’.
2) Take the minimum of ‘maxLeftHeight’ and ‘maxRightHeight’ and subtract it from the current elevation o... - Q3.
Rotting Oranges Problem Statement
You are given a grid containing oranges where each cell of the grid can contain one of the three integer values:
- 0 - representing an empty cell
- 1 - representing a fre...
- Ans.
Approach : I solved this problem using Multisource-BFS as I had solved questions similar to this while preparing for
my interviews.
Steps :
1) Initialize ‘TIME’ to 0.
2) Declare a Queue data structure and a 2D boolean array ‘VISITED’.
3) Push all cells with rotten orange to the queue.
4) Loop till queue is not empty
4.1) Get the size of the current level/queue.
4.2) Loop till the 'LEVEL_SIZE' is zero:
i) Get the front cell of t...
(3 Questions)
Round duration - 60 Minutes
Round difficulty - Medium
This was a standard DS/Algo round where I was given 2 questions to solve under 60 minutes. I was able to come up with the optimal approach for both the questions and then at the end of the interview I was also asked the famous Die Hard Water Puzzle.
- Q1.
Queue Using Stacks Implementation
Design a queue data structure following the FIFO (First In First Out) principle using only stack instances.
Explanation:
Your task is to complete predefined functions t...
- Ans.
A queue can be implemented using two stacks. Let queue to be implemented be q and stacks used to implement q be stack1 and stack2. q can be implemented in two ways:
Approach 1 (By making enQueue operation costly) : This method makes sure that oldest entered element is always at the top of stack 1, so that deQueue operation just pops from stack1. To put the element at top of stack1, stack2 is used.
enQueue(q, ... - Q2.
Merge Intervals Problem Statement
You are provided with 'N' intervals, each containing two integers denoting the start time and end time of the interval.
Your task is to merge all overlapping intervals a...
- Ans.
Approach :
1) We will first sort the intervals by non-decreasing order of their start time.
2) Then we will add the first interval to our resultant list.
3) Now, for each of the next intervals, we will check whether the current interval is overlapping with the last interval in
our resultant list.
4) If it is overlapping then we will update the finish time of the last interval in the list by the maximum of the finish time
of ... - Q3. You have a 3-liter jar and a 5-liter jar. How can you measure exactly 4 liters using these two jars?
- Ans.
Approach :
1) Fill the 5 liter jug from the tap.
2) Empty the 5 liter jug into the 3 liter jug - leaving 2 liters in the 5 liter jug.
3) Pour away the contents of the 3 liter jug.
4) Fill the 3 liter jug with the 2 liters from the 5 liter jug - leaving 2 liters in the 3 liter jug.
5) Fill the 5 liter jug from the tap.
6) Fill the remaining 1 liter space in the 3 liter jug from the 5 liter jug.
7) Leaving 4 liters in the
(4 Questions)
Round duration - 60 Minutes
Round difficulty - Medium
This round had 2 coding questions - first one related to Binary Tree and the second one was a simple question from Bit Manipulation. This was followed by some questions from OOPS.
- Q1.
Binary Tree Diameter Problem Statement
You are given a Binary Tree, and you need to determine the length of the diameter of the tree.
The diameter of a binary tree is the length of the longest path betwe...
- Ans.
Approach 1 :
Steps :
1) If the ‘root’ node is NULL, return 0. The diameter of an empty tree is 0.
2) Recur for the left subtree and store the diameter of the left subtree in a variable ‘leftDiameter’, i.e.
‘leftDiameter’ = getDiameter(left child of the root node)
3) Similarly, recur for the right subtree and store the diameter of the right subtree in a variable
‘rightDiameter’ i.e. ‘rightDiameter’ = getDiameter(right child o... - Q2.
Power of 2 Problem Statement
Determine if it is possible to reorder the digits of a given integer 'N' such that the resulting number is a power of two. The leading digit must not be zero.
Input:
The fir... - Ans.
Approach : If a number N is power of 2 then bitwise & of N and N-1 will be zero. We can say N is a power of 2 or not
based on the value of N&(N-1). The expression N&(N-1) will not work when N is 0.
So,handle that case separately.
TC : O(1)
SC : O(1) - Q3. What are some advantages of using Object-Oriented Programming (OOP)?
- Ans.
1) OOPs is very helpful in solving very complex level of problems.
2) Highly complex programs can be created, handled, and maintained easily using object-oriented programming.
3) OOPs, promote code reuse, thereby reducing redundancy.
4) OOPs also helps to hide the unnecessary details with the help of Data Abstraction.
5) OOPs, are based on a bottom-up approach, unlike the Structural programming paradigm, which uses a top-d... - Q4. What are access specifiers and what is their significance in Object-Oriented Programming?
- Ans.
Access specifiers, as the name suggests, are a special type of keywords, which are used to control or specify the
accessibility of entities like classes, methods, etc. Some of the access specifiers or access modifiers include “private”,
“public”, etc. These access specifiers also play a very vital role in achieving Encapsulation - one of the major features
of OOPs.
(1 Question)
Round duration - 30 Minutes
Round difficulty - Easy
This was my last round and I hoped it to go good just like the other rounds. The interviewer was very straight to point
and professional. The interview lasted for 30 minutes.
- Q1. Why should we hire you?
- Ans.
Tip 1 : The cross questioning can go intense some time, think before you speak.
Tip 2 : Be open minded and answer whatever you are thinking, in these rounds I feel it is important to have opinion.
Tip 3 : Context of questions can be switched, pay attention to the details. It is okay to ask questions in these round,
like what are the projects currently the company is investing, which team you are mentoring. How all is the ...
Interview Preparation Tips
Tip 1 : Must do Previously asked Interview as well as Online Test Questions.
Tip 2 : Go through all the previous interview experiences from Codestudio and Leetcode.
Tip 3 : Do at-least 2 good projects and you must know every bit of them.
Tip 1 : Have at-least 2 good projects explained in short with all important points covered.
Tip 2 : Every skill must be mentioned.
Tip 3 : Focus on skills, projects and experiences more.
Skills evaluated in this interview
Practo interview questions for designations
Interview Questionnaire
8 Questions
- Q1. Implement queue with the help of two stacks
- Ans.
Queue can be implemented using two stacks by maintaining the order of elements in the stacks.
Create two stacks, let's call them stack1 and stack2
When an element is enqueued, push it to stack1
When an element is dequeued, pop all elements from stack1 and push them to stack2
Pop the top element from stack2 and return it as the dequeued element
If stack2 is empty, repeat step 3
To get the front element of the queue, peek the
- Q2. Iven a table “student” of with columns Name and Marks. You have to write a SQL query to get the 2nd highest marks from the table. Also write a query to find the nth highest marks, where n can be any number
- Q3. What is left join. Give example. And Full outer join?
- Ans.
Left join returns all records from left table and matching records from right table. Full outer join returns all records from both tables.
Left join is used to combine two tables based on a common column.
In left join, all records from the left table are returned along with matching records from the right table.
If there is no match in the right table, NULL values are returned.
Example: SELECT * FROM table1 LEFT JOIN table...
- Q4. What is magic functions and autoloading in PHP?
- Ans.
Magic functions are special methods in PHP that start with __. Autoloading is a way to automatically load classes.
Magic functions are used to handle certain events in PHP, such as object creation or property access.
Autoloading allows PHP to automatically load classes when they are needed, without requiring manual includes.
Magic functions can be used in conjunction with autoloading to dynamically load classes or handle
- Q5. Given three arrays sorted in non-decreasing order, print all common elements in these arrays. Examples: ar1[] = {1, 5, 10, 20, 40, 80} ar2[] = {6, 7, 20, 80, 100} ar3[] = {3, 4, 15, 20, 30, 70, 80, 120} Ou...
- Ans.
Given three sorted arrays, find common elements.
Create three pointers to traverse each array
Compare the elements at the pointers and move the pointer of the smallest element
If all pointers point to the same element, add it to the result and move all pointers
Repeat until any pointer reaches the end of its array
- Q6. A puzzle. You will be given with a 3 Litre container & a 7 Litre Container. Measure exactly 5 Litres of water
- Q7. Asked about one of my projects I mentioned in my resume?
- Q8. Find if a number is a power of 2 or not?
- Ans.
Check if a number is a power of 2 or not.
A power of 2 has only one bit set in its binary representation.
Use bitwise AND operator to check if the number is a power of 2.
If n is a power of 2, then n & (n-1) will be 0.
Interview Preparation Tips
College Name: na
Motivation: Overall it was a very good experience. They test you from every aspect. In the End I would like to say that Practo is one of the best companies to work for.
Skills evaluated in this interview
Get interview-ready with Top Practo Interview Questions
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- Q1. Tell me about yourself tell me about your internship My interview was unstructured(i.e based on your reply interviewer was asking Questions)
Interview Preparation Tips
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Practo Interview FAQs
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