Copart Software Developer Interview Questions and Answers

Q1. Concepts of object oriented programming
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Q1. What is the use of static keyword
Ans. 
Static keyword is used in programming to declare variables, methods, or classes that belong to the class itself rather than instances of the class.
• Static variables are shared among all instances of a class

• Static methods can be called without creating an instance of the class

• Static classes cannot be instantiated and are used for grouping related methods or constants

• Static keyword is also used in C to declare functions t
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Q1. SELL ABD BUY 1 array question(easy level)
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This question involves buying and selling items in an array.
• The array must contain strings.

• You need to implement a function to buy and sell items from the array.

• Provide examples of buying and selling operations.
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Q1. About oops, java , python basics
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Q2. About yourself and your skills
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Q3. Reversal a linked list
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Q4. List out some mobile operating system
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Q5. About your final year project
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Q1. Basic questions about your experience and expectations
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A take home assignment

Round duration - 120 minutes
Round difficulty - Hard

There was 2 parts. First part problems were based on Quantitative Aptitude. Problems were of 3 types- Easy, Medium and Hard with different scores. Difficulty keeps on increasing if you answer correctly and keeps on decreasing if you answer incorrectly.
First part was of 45 mins.
Second part consisted of 2 coding problems- Medium, Hard. One was based on Greedy and other was a difficult DP + Bitmask problem.
Coding part had more weightage than Aptitude.

Q1. 
K Centers Selection Problem
In Ninja Land, there are cities numbered from 0 to N-1. The distances between each pair of cities are represented by an N * N matrix 'DIST', where 'DIST[i][j]' is the distance ...read more
Ans. Brute force
This problem is an NP-Hard problem i.e there exists no polynomial-time solution for it. So we cannot do anything more than brute force for the exact solution. See this link for more information.
 
Algorithm
• This is a recursive algorithm.
• Create an empty integer list/vector ‘SELECTED’ of size ‘N’.
• Initialize an integer variable ‘RESULT’:= INF.
• We make a recursive function, let it be kCenterHelper(K, N, SELECTE...read more
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Q2. 
Beautiful String Verification
Given a non-empty string inputString, determine if it can be converted into a 'Beautiful String' using the defined operation.
You can perform any number of operations to con...read more
Ans. Brute Force
The idea is to insert “abc” at every position in a string , “helperString” (initialised as an empty string) recursively and comparing it with the input string “inputString” at every recursive step. If the “helperString” comes out to be equal to input string “inputString” then return “True” to the function else “False”.
 
Algorithm:
 
• First make a recursive boolean  function “Solve” and pass “helpe...read more
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Round duration - 90 minutes
Round difficulty - Medium

There were 3 interviewers in my panel. The most senior panellist asked q. related to my interests and internship experience.
Other 2 asked questions related to Coding and subjects. There was 1 coding question which was implementation based and involved many corner cases. They were checking if I was able to figure out different corner cases and handle those. 
There were situation based questions also asked. One question was on system design of Arogya Setu App.

Q1. 
Complex Number Multiplication
Calculate the product of two complex numbers represented as strings in the form “A+Bi”. Here, ‘A’ represents the real part, and ‘B’ represents the imaginary part.
Explanatio...read more
Ans. Mathematics
Let first and the second complex number be, ‘a + bi’ and ‘c+di’, then 
 
'RESULT' = (a + bi) *(c + di) = (ac + adi) = (bci + bd * (-1)) as i^2 = -1
 
‘RESULT’ = (ac - bd) + (ad+ bc) i 
 
The steps are as follows:
 
1. We will parse the input and extract the real and imaginary parts of the number.
2. Let ‘REAL1’, ‘IMG1’ store the real and imaginary part of the first number.
3. Let ‘REAL2’, ‘IMG2’ ...read more
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Round duration - 30 minutes
Round difficulty - Easy

HR round involved basic questions related to background and behaviour. It was basically a cultural fit round.