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30+ Gangothri Developers Interview Questions and Answers

Updated 5 Feb 2024

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. The intersection is defined as the set of e...read more

Ans.

Find the intersection of two unsorted arrays while maintaining the order of elements from the first array.

  • Iterate through the elements of the first array and check if they exist in the second array.

  • Use a hash set to keep track of elements already seen in the second array for efficient lookup.

  • Maintain the order of elements from the first array while finding the intersection.

  • Handle duplicate elements in both arrays appropriately.

  • Output the intersection elements in the order the...read more

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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 empty cell
  • 1 - representing a fresh orange...read more
Ans.

Find the minimum time required to rot all fresh oranges adjacent to rotten oranges.

  • Create a queue to store the coordinates of rotten oranges and perform BFS to rot adjacent fresh oranges.

  • Track the time taken to rot all fresh oranges and return -1 if not all fresh oranges can be rotten.

  • Update the grid with the new state of oranges after each second.

  • Handle edge cases such as empty grid or no fresh oranges present.

  • Example: For the given grid, the minimum time required is 4 secon...read more

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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 must not be zero.

Input:

The first line ...read more
Ans.

The problem involves determining if it is possible to reorder the digits of a given integer to form a power of 2.

  • Iterate through all possible permutations of the digits of the given integer.

  • Check if any of the permutations form a power of 2.

  • Return 1 if a valid permutation is found, else return 0.

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Q4. 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 true if it is a palindrome...read more

Ans.

Check if a given singly linked list is a palindrome or not.

  • Traverse the linked list to find the middle element using slow and fast pointers.

  • Reverse the second half of the linked list.

  • Compare the first half with the reversed second half to determine if it's a palindrome.

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Q5. 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 the c...read more

Ans.

The task is to determine the total number of ways to make change for a specified value using given denominations.

  • Create a function that takes in the number of denominations, the denominations array, and the value to make change for as input

  • Use dynamic programming to iterate through all possible combinations of coins to make the specified value

  • Keep track of the number of ways to make change for each value from 0 to the target value

  • Return the total number of ways to make change...read more

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Q6. 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 between any ...read more

Ans.

The task is to find the diameter of a binary tree, which is the length of the longest path between any two end nodes in the tree.

  • Traverse the tree to find the longest path between two nodes.

  • Keep track of the maximum diameter found during traversal.

  • The diameter may not necessarily pass through the root node.

  • Consider both left and right subtrees while calculating the diameter.

  • Example: For input 1 2 3 4 -1 5 6 -1 7 -1 -1 -1 -1 -1 -1, the diameter is 6.

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Q7. 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 clockw...read more

Ans.

Search for an element in a rotated sorted array efficiently in O(logN) time complexity.

  • Implement binary search to find the pivot point where rotation occurs.

  • Divide the array into two subarrays and perform binary search on the appropriate subarray.

  • Handle cases where the element may be in the left or right subarray after rotation.

  • Return the index of the element if found, else return -1.

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Q8. 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.

Explanat...read more

Ans.

Check if two strings are anagrams by rearranging their letters.

  • Create a frequency map of characters for both strings

  • Compare the frequency maps to check if they are equal

  • Return True if the frequency maps are equal, else False

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Q9. Balanced Parentheses Combinations

Given an integer N representing the number of pairs of parentheses, find all the possible combinations of balanced parentheses using the given number of pairs.

Explanation:

Con...read more

Ans.

Generate all possible combinations of balanced parentheses for a given number of pairs.

  • Use recursion to generate all possible combinations of balanced parentheses.

  • Keep track of the number of open and close parentheses used in each combination.

  • Return the valid combinations as an array of strings.

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Q10. 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 to suppor...read more

Ans.

Implement a queue using stacks following FIFO principle.

  • Use two stacks to simulate a queue.

  • For enQueue operation, push elements onto stack1.

  • For deQueue operation, if stack2 is empty, pop all elements from stack1 and push onto stack2, then pop from stack2.

  • For peek operation, if stack2 is empty, pop all elements from stack1 and push onto stack2, then return top of stack2.

  • For isEmpty operation, check if both stack1 and stack2 are empty.

  • Example: enQueue(5), enQueue(10), peek(), d...read more

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Q11. 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 and retu...read more

Ans.

Merge overlapping intervals and return sorted list of merged intervals by start time.

  • Sort the intervals based on start time.

  • Iterate through intervals and merge overlapping ones.

  • Return the merged intervals in sorted order.

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Q12. In how many ways can you display HTML elements?
Ans.

There are multiple ways to display HTML elements, including inline, block, inline-block, and flex.

  • HTML elements can be displayed as inline, which allows them to flow with surrounding content.

  • Block elements take up the full width available and start on a new line.

  • Inline-block elements are displayed as blocks, but flow like inline elements.

  • Flexbox allows for more advanced layout options, such as aligning items and distributing space.

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Q13. Longest Substring Without Repeating Characters Problem Statement

Given a string S of length L, determine the length of the longest substring that contains no repeating characters.

Example:

Input:
"abacb"
Output...read more
Ans.

Find the length of the longest substring without repeating characters in a given string.

  • Use a sliding window approach to keep track of the longest substring without repeating characters.

  • Use a hashmap to store the index of each character in the string.

  • Update the start index of the window when a repeating character is encountered.

  • Calculate the maximum length of the substring as you iterate through the string.

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Q14. Trapping Rain Water Problem Statement

You are given a long type array/list ARR of size N, representing an elevation map. The value ARR[i] denotes the elevation of the ith bar. Your task is to determine the tota...read more

Ans.

Calculate the total amount of rainwater that can be trapped between given elevations in an array.

  • Iterate through the array and calculate the maximum height on the left and right of each bar.

  • Calculate the amount of water that can be trapped at each bar by taking the minimum of the maximum heights on the left and right.

  • Sum up the trapped water at each bar to get the total trapped water for the entire array.

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Q15. 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

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Q16. 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} Output:...

read more
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

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Q17. 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

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Q18. 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

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Q19. What are access specifiers and what is their significance in Object-Oriented Programming?
Ans.

Access specifiers define the level of access to class members in Object-Oriented Programming.

  • Access specifiers include public, private, protected, and default

  • Public members are accessible from outside the class

  • Private members are only accessible within the class

  • Protected members are accessible within the class and its subclasses

  • Default access is when no access specifier is specified

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Q20. How can you optimize the loading of website assets?
Ans.

Optimizing website asset loading involves minimizing file sizes, reducing HTTP requests, utilizing caching, and prioritizing critical resources.

  • Minimize file sizes by compressing images, scripts, and stylesheets.

  • Reduce HTTP requests by combining files, using sprites, and lazy loading non-essential resources.

  • Utilize browser caching to store static assets locally for faster subsequent page loads.

  • Prioritize critical resources like above-the-fold content to ensure faster renderin...read more

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Q21. What is the difference between abstraction and inheritance?
Ans.

Abstraction is hiding the implementation details while inheritance is a mechanism for creating new classes using existing classes.

  • Abstraction focuses on hiding the internal implementation details of a class, allowing the user to only interact with the necessary information.

  • Inheritance allows a class to inherit properties and behavior from another class, promoting code reusability and creating a hierarchy of classes.

  • Abstraction is achieved through abstract classes and interfac...read more

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Q22. You have a 3-liter jar and a 5-liter jar. How can you measure exactly 4 liters using these two jars?
Ans.

Fill the 5-liter jar, pour it into the 3-liter jar, fill the 5-liter jar again, and pour enough to fill the 3-liter jar. This leaves 4 liters in the 5-liter jar.

  • Fill the 5-liter jar

  • Pour the 5 liters into the 3-liter jar

  • Fill the 5-liter jar again

  • Pour enough to fill the 3-liter jar

  • 4 liters will be left in the 5-liter jar

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Q23. What are some advantages of using Object-Oriented Programming (OOP)?
Ans.

Advantages of OOP include code reusability, modularity, and easier maintenance.

  • Code reusability: Objects can be reused in different parts of the program, reducing redundancy.

  • Modularity: OOP allows for breaking down complex problems into smaller, more manageable parts.

  • Easier maintenance: Changes to one part of the codebase do not necessarily affect other parts, making maintenance easier.

  • Encapsulation: Data hiding and abstraction help in protecting data and only exposing necess...read more

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Q24. A puzzle. You will be given with a 3 Litre container & a 7 Litre Container. Measure exactly 5 Litres of water

Ans.

Measure 5 litres of water using 3 and 7 litre containers.

  • Fill the 3 litre container completely

  • Pour the water from the 3 litre container into the 7 litre container

  • Fill the 3 litre container again and pour it into the 7 litre container until it is full

  • The remaining water in the 3 litre container is 1 litre

  • Empty the 7 litre container and pour the 1 litre water from the 3 litre container into it

  • Fill the 3 litre container again and pour it into the 7 litre container

  • The 7 litre con...read more

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Q25. 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 table2 ON table1.id = table2.id;

  • Full outer join returns all rec...read more

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Q26. 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

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Q27. What is event bubbling in JavaScript?
Ans.

Event bubbling is the process where an event triggered on a child element is propagated up through its parent elements.

  • In event bubbling, when an event occurs on a child element, it first runs the event handlers on the child element, then on its parent, then all the way up to the top level of the DOM.

  • Event bubbling allows for delegation of event handling to a parent element, reducing the number of event listeners needed.

  • To stop event bubbling, you can use the stopPropagation(...read more

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Q28. 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 errors.

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Q29. What is a static variable in C?
Ans.

A static variable in C is a variable that retains its value between function calls.

  • Declared using the 'static' keyword

  • Retains its value throughout the program's execution

  • Useful for maintaining state across function calls

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Q30. 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

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Q31. 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

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Q32. 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

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Q33. 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 top element of stack2

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Q34. 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.

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Q35. 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

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