Go-Jek Interview Questions, Process, and Tips

Round duration - 45 Minutes
Round difficulty - Easy

Q1. 
Beautiful String Problem Statement
Given a binary string STR containing either '0' or '1', determine the minimum number of operations needed to make it beautiful. A binary string is called beautiful if it...read more
Ans. 
Determine the minimum number of operations needed to make a binary string beautiful by having alternating 0s and 1s.
• Iterate through the binary string and count the number of operations needed to make it beautiful by flipping the bits if they are the same.

• Keep track of the current bit and compare it with the next bit to determine if an operation is needed.

• Return the total number of operations needed for each test case.
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Q2. 
Reverse Blocks Problem Statement
You are provided with a Singly Linked List of integers and an integer array B of size N. Each element in the array B indicates a block size. Your task is to reverse the no...read more
Ans. 
Reverse nodes within blocks of specified sizes in a singly linked list.
• Iterate through the linked list and reverse nodes within each block size specified in the array.

• Handle cases where block size exceeds remaining nodes by reversing the remaining nodes as one block.

• Update pointers accordingly to reverse the nodes within each block size.
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Round duration - 45 Minutes
Round difficulty - Easy

Q1. 
Maximum Sum Rectangle Problem Statement
Given a matrix ARR with dimensions N x M, your task is to identify the rectangle within the matrix that has the maximum sum of its elements.
Input:
The first line...read more
Ans. 
Find the rectangle within a matrix that has the maximum sum of its elements.
• Iterate through all possible rectangles within the matrix

• Calculate the sum of each rectangle

• Keep track of the maximum sum found
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Round duration - 30 minutes
Round difficulty - Easy

Basic questioning about my work experiences, things I have developed and created, my work experience(internships). The challenges which I have faced and how I overcame them. Basic questions about some android concepts

Q1. What puzzles were asked during the interview, and can you describe the projects you discussed?
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Round duration - 45 minutes
Round difficulty - Medium

The interviewer was very friendly and asked about various things and tried to judge my understanding of the projects and how deep I know about the concepts I have implemented in my projects

Q1. RxJava
RxJava
Ans. 
RxJava is a popular library for composing asynchronous and event-based programs using observable sequences.
• RxJava provides a functional API for working with asynchronous data streams.

• It uses Observables to emit items and notify subscribers.

• Operators can be used to transform, filter, and combine these streams of data.

• Schedulers are used to control the threading behavior of these operations.

• Example: Creating an Observabl...read more
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Round duration - 40 minutes
Round difficulty - Medium

This was a system design round

Q1. Can you explain the fragment lifecycle in Android system design?
Ans. 
Fragment lifecycle in Android involves various states and methods for managing UI components.
• Fragments have several lifecycle states such as created, started, resumed, paused, stopped, and destroyed.

• Methods like onCreate(), onCreateView(), onResume(), onPause(), onStop(), onDestroy() are used to manage fragment lifecycle.

• Fragment lifecycle is closely tied to the hosting Activity's lifecycle.

• Example: When a fragment is ...read more
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