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

# SDE - 1

Coinbase
3 rounds | 4 Coding problems

## Interview preparation journey

Journey
My personal journey is very challenging coming from a middle-class family I need not have the access to a computer for a long time. I came to know about computer when i joined my college but from there i never look back again.
Application story
This is an on-campus placement opportunity for me the company visited my campus for the placement .
Why selected/rejected for the role?
This was a great experience for me i was able to perform well, and i am satisfied with the effort i have put forward.
Preparation
Duration: 4 months
Topics: Data Structures, Pointers, OOPS, System Design, Algorithms, Dynamic Programming
Tip

Tip 1 : Prepare your resume well.
Tip 2 : Deploy your projects so that the interviewer can view it. Also provide a hyperlink on your resume.
Tip 3 : Be thorough with Data Structures and Algorithms. Also prepare well topics such as OS,DBMS.

Application process
Where: Campus
Eligibility: Above 7 CGPA
Resume tip

Tip 1 : Deploy your projects so that the interviewer can view it. Also, provide a hyperlink on your resume
Tip 2 : It's not important to have fancy projects. Only mention those on which you're confident.

## Interview rounds

01
Round
Easy
Video Call
Duration45 minutes
Interview date17 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. Sort An Array According To The Count Of Set Bits

Moderate
25m average time
80% success
0/80

#### You are given an array consisting of N positive integers, and your task is to sort the array in decreasing order of count of set bits in the binary representation of the integers present in th...

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Problem approach

You are given an array consisting of N positive integers, and your task is to sort the array in decreasing order of count of set bits in the binary representation of the integers present in the array.
In other words, you have to modify the array such that an integer with more number of set bits should appear before the integer which has lesser number of set bits in its binary representation....

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02
Round
Easy
Video Call
Duration45 minutes
Interview date17 Nov 2022
Coding problem1

### 1. Minimum Number Of Lamps

Easy
10m average time
80% success
0/40
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Problem approach

You are given a string 'S' containing dots(.) and asterisks(*) only, where the dot represents free spaces, and the asterisk denotes lamps. A lamp can lighten up its own cell as well as its immediate neighboring cells. You need to determine the minimum number of extra lamps that have to be installed at some free spaces in the string so that the whole string will be illuminated i.e. all the indic...

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03
Round
Easy
HR Round
Duration30 minutes
Interview date17 Nov 2022
Coding problem1

### 1. Basic HR Questions

Why do you want to work for our company?
What are your greatest strengths and weaknesses?

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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