One97 Interview Experience | Set 3 (Backend/Node js Developer)

Round 1 
Q1. Multiply two 2d matrices 

Q2 You are given a stack in which elements are filled at runtime. And standard push and pop operation. Now write a function in which you minimum element in the stack at any particular instance. 

Round 2 
Q1 Given an array of size, n contains elements from 1 to n in any order(unsorted). Now one element is duplicate. Find that element without using extra space. 

Q2 Given an array that contains the repeated element in consecutive order. Now write a recursive function that removes successive pieces from the collection. 

Q3 Given an array, find subarray, which has zero-sum. 

Q4 Some talk on node js. and its event-driven model. Why we use Nginx as a proxy server. 

Q5. Find the number of unique visitors on a website having traffic up to 0.5 million daily(let’s say). How will your number of unique visitors? 

Q6 Given a histogram, find the maximum area of a rectangle. 

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