SDE - Intern

You have 'N' empty pens whose refills have been used up. You have 'R' rupees in your pocket. You have two choices of operations that you can perform each time.

1) Recycle 1 empty pen and get 'K' rupees as a reward.

2) Buy 1 refill for 'C' rupees and combine it with 1 empty pen to make one usable pen.

Your task is to find the maximum number of usable pens that you can get.

For example if you have 'N' = 5 , 'R' = 10 , 'K' = 2 , 'C' = 3. You can recycle one pen and get 2 rupees as a reward so you will have a total of 12 rupees. Now you can buy 4 refills and combine it with 4 pens to make it usable. So your answer is 4.

Given an array A[],and constants b, k and m. A paint job is created using the formula s[i] = (A[i]*s[i-1] + b )% m.
Find all the pairs in s[i] less than equal to K and print them.

What are ACID properties? Explain them?

Describe the architecture of your project. How did you manage to handle multiple transactions occurring at one point?

What do you know about NodeJS event loop? Given a set of callback functions. Determine which function runs first.