Koo App Software Engineer II Interview Questions and Answers

Market related question

Round duration - 90 minutes
Round difficulty - Hard

Timing was late evening. Platform was good.

Q1. 
Largest Cycle in Maze Problem Statement
Given a maze represented by 'N' cells numbered from 0 to N-1, and an array arr of 'N' integers where arr[i] denotes the cell number that can be reached from the 'i'...read more
Ans. 
Identify the length of the largest cycle in a maze represented by cells and an array of integers.
• Iterate through each cell and find the cycle length using DFS or Floyd's Tortoise and Hare algorithm.

• Handle self-cycles and cells with no exit by checking arr[i] = i and arr[i] = -1 respectively.

• Output the length of the largest cycle found or -1 if no cycles exist.
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Q2. 
Ninja and the Maze Problem Statement
Ninja is stuck in a maze represented as a 2D grid. He can move in four directions (Up, Down, Left, Right) until he hits a wall ('1'). Once stopped, he can choose a new...read more
Ans. 
Determine if Ninja can reach the destination in a maze by moving in four directions until hitting a wall.
• Create a function to traverse the maze using depth-first search or breadth-first search.

• Keep track of visited cells to avoid infinite loops.

• Return 'True' if destination is reachable, 'False' otherwise.
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Basic aptitude,sql ques

Visualizing the dataset information

Q1. Asked around js concepts and simple machine coding to display image on click of button
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Q1. Web fundamentals
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Q1. JS concepts CSR vs SSR System design of Blinkit
Ans. 
CSR vs SSR in system design of Blinkit
• CSR (Client-Side Rendering) involves rendering web pages on the client side using JavaScript, while SSR (Server-Side Rendering) involves rendering web pages on the server side before sending them to the client.

• CSR can provide faster initial page load times and better interactivity, but may result in slower subsequent page loads and SEO challenges.

• SSR can improve SEO and initial pag...read more
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