Coinbase interview experience Real time questions & tips from candidates to crack your interview

# SDE - 1

Coinbase
2 rounds | 4 Coding problems

## Interview preparation journey

Journey
I came to know about this job from there official site i have applied to this job and get selected for exam, then i have given the exam and also got selected for the interview
Application story
I applied for this profile on the company website where i got the test link after applying for the jobs
Why selected/rejected for the role?
I was not able to answer the optimal approach for a problem that's why i think i was rejected in the interview
Preparation
Duration: 4 months
Topics: Data Structures, Pointers, OOPS, System Design, Algorithms, Dynamic Programming
Tip

Tip 1 : Graph should be on your tips.
Tip 2 : while explaining the solution to interviewer, dont just hop onto the most optimal solution. Start with the brute force one, give the cons of brute force solution, and then go step by step till you reach the optimal solution.
Tip 3 : Improve on your communication skills as well.

Application process
Where: Company Website
Eligibility: Above 7 CGPA
Resume tip

Tip 1 : Mention only what is required for your profile, for e.g. do not stress too much on your co curricular stuff. Rather, try explaining more of your technical stuff that is relevant for your job.
Tip 2 : keep it limited to 1 page. And make sure its a pdf and not an image.

## Interview rounds

01
Round
Easy
Video Call
Duration60 minutes
Interview date11 Nov 2022
Coding problem2

### 1. Trapping Rain Water

Moderate
15m average time
80% success
0/80

#### It represents an elevation map wherein 'arr[i]’ denotes the elevation ...

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Problem approach

You have been given a long type array/list 'ARR' of size 'N'. It represents an elevation map wherein 'ARR[i]' denotes the elevation of the 'ith' bar. Print the total amount of rainwater that can be trapped in these elevations.

### 2. Stack using queue

Moderate
25m average time
65% success
0/80

#### There should be two data members, both being Queues to store the data internally. ...

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Problem approach

Implement a Stack Data Structure specifically to store integer data using two Queues.
There should be two data members, both being Queues to store the data internally. You may use the inbuilt Queue.

02
Round
Easy
Video Call
Duration60 minutes
Interview date11 Nov 2022
Coding problem2

### 1. Queue Using Two Stacks

Easy
15m average time
85% success
0/40

#### You will be given ‘Q’ queries. You need to implement a queue using two stacks according to those queries. Each query will belong to one of these three types:

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Problem approach

Implement a Stack Data Structure specifically to store integer data using two Queues.
There should be two data members, both being Queues to store the data internally. You may use the inbuilt Queue.

### 2. Gold mine problem

Moderate
35m average time
70% success
0/80

#### You have been given a gold mine represented by a 2-d matrix of size ('N' * 'M') 'N' rows and 'M' columns. Each field/cell in this mine contains a positive integer, the amount of gold ...

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Problem approach

You have been given a gold mine represented by a 2-d matrix of size ('N' * 'M') 'N' rows and 'M' columns. Each field/cell in this mine contains a positive integer, the amount of gold in kgs.
Initially, the miner is at the first column but can be at any row.

Here's your problem of the day

Solving this problem will increase your chance to get selected in this company

What is the result of 4 % 2?

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