PowerSchool India Senior Software Engineer 1 Interview Questions and Answers

Q1. Polyfills and Logical
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Q2. List in react and the input box
Ans. 
Answer on how to list in react and the input box
• Use the map function to create a list in React

• Use the state to store the input value

• Use onChange event to update the state when the input value changes

• Use onSubmit event to handle the form submission
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Round duration - 60 Minutes
Round difficulty - Easy

It was an coding round

Q1. 
The Skyline Problem
Compute the skyline of given rectangular buildings in a 2D city, eliminating hidden lines and forming the outer contour of the silhouette when viewed from a distance. Each building is ...read more
Ans. 
Compute the skyline of given rectangular buildings in a 2D city, eliminating hidden lines and forming the outer contour of the silhouette.
• Iterate through the buildings and create a list of critical points (x, y) where the height changes.

• Sort the critical points based on x-coordinate and process them to form the skyline.

• Merge consecutive horizontal segments of equal height into one to ensure no duplicates.

• Return the fin...read more
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Q2. 
Rat in a Maze Problem Statement
You need to determine all possible paths for a rat starting at position (0, 0) in a square maze to reach its destination at (N-1, N-1). The maze is represented as an N*N ma...read more
Ans. 
Find all possible paths for a rat in a maze from source to destination.
• Use backtracking to explore all possible paths in the maze.

• Keep track of visited cells to avoid revisiting them.

• Recursively try moving in all directions (up, down, left, right) until reaching the destination.

• Return a list of strings representing valid paths sorted in alphabetical order.
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Round duration - 30 Minutes
Round difficulty - Easy

It was an HR round with some general questions. it was just for formality.

Q1. What is react, diff between react and angular, deep copy shallow copy, hoisting, diff between props and state
Ans. 
React is a JavaScript library for building user interfaces. It is different from Angular in various ways.
• React is a library while Angular is a framework

• React uses virtual DOM while Angular uses real DOM

• React is more flexible and easier to learn than Angular

• Deep copy creates a new object with the same values while shallow copy creates a new reference to the same object

• Hoisting is a JavaScript mechanism where variables a...read more
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Q2. Implement custom hooks and array flat method
Ans. 
Implement custom hooks and array flat method
• Custom hooks are reusable functions that allow you to extract component logic into reusable functions

• Array flat method is used to flatten an array of nested arrays into a single array

• To implement custom hooks, create a function that uses the useState and useEffect hooks

• To implement array flat method, use the reduce method to flatten the array
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Python technical SQL basic

Q1. Check if string is palindrome
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Two dynamic programming challenges at the hard level on LeetCode and 10 medium-level SQL challenge.

Q1. Q1 difference between let and const
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Q2. Q2 what are closures?
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Q3. Q3. What is typeof null
Ans. 
typeof null returns 'object' in JavaScript.
• typeof null is 'object' in JavaScript

• This is a historical bug in JavaScript that has not been fixed for backward compatibility

• Example: console.log(typeof null) will output 'object'
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Q1. Q1. Find palindrome strings in an array of strings.
Ans. 
Finding palindrome strings in an array of strings.
• Iterate through each string in the array.

• For each string, check if it is equal to its reverse to determine if it is a palindrome.

• Store palindrome strings in a separate array or print them out.
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Q2. Q2. Explain debouncing with example.
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Q1. Machine coding round design drivezy app. It should be demoable.
Ans. 
Design a Drivezy app for vehicle rental with user-friendly features and seamless booking experience.
• User Registration: Allow users to sign up using email or social media accounts.

• Vehicle Listing: Display available vehicles with images, descriptions, and pricing.

• Booking System: Implement a calendar for users to select rental dates and times.

• Payment Integration: Support multiple payment methods like credit cards, UPI, an...read more
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Q1. Add 2 linked list and return final linked list
Ans. 
Add 2 linked lists and return final linked list
• Create a new linked list to store the sum

• Traverse both linked lists simultaneously and add the corresponding nodes

• Handle carry over while adding nodes

• If one linked list is longer than the other, add the remaining nodes to the sum list
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Q2. Find a Element in rotated sorted array
Ans. 
Finding an element in a rotated sorted array.
• Use binary search to find the pivot point where the array is rotated.

• Determine which half of the array the target element is in.

• Perform binary search on that half of the array to find the target element.

• Handle edge cases such as when the target element is at the pivot point.
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Q1. Matrix chain multiplication
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Q2. Find word in matrix.
Ans. 
Given a matrix of characters and a word, find if the word exists in the matrix.
• Traverse the matrix and check if the first letter of the word matches any cell.

• If it does, check if the adjacent cells match the next letter of the word.

• Repeat until the entire word is found or no match is found.
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Q1. Stock buy sell problem to maximize profit.
Ans. 
Algorithm to maximize profit by buying and selling stocks.
• Iterate through the array of stock prices

• Keep track of the minimum price seen so far

• Calculate the profit if sold at current price

• Update maximum profit seen so far

• Return maximum profit
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