First one with the Manager of the team. He asked me about my research work and gave me one dynamic programming coding problem. Then asked 2 behavioral questions. Next day I attend another interview with one of the team members. He gave me a problem and asked to compute linear programming. Then asked about some famous optimization algorithms.
coding experience in python. OR experience
1) First 15 mins. : Self Intro, Talk about one project that you are proud to work on, learnt alot, etc. 2) Last 15 mins : Imagine a df with a col A which has series of 1 to 10, want to extract the even numbers of series. - write the syntax in the chat section. There are two tables with two columns each. Table A has a categorical column with multiple duplicate values corresponding to which a number is associated in other column while in Table B same columns are there, just that now categorical columns have unique values with added values to each corresponding unique categorical column. Derive Table B from A using pandas. Order of execution in SQL What is a bias-variance tradeoff? What is an imbalanced dataset? What is the thumbrule ratio to say the data is imbalanced? Imagine you are training a data model on an imbalance set, how will evaluate on the data validation. What is F1-score and why F1 over precision/recall? What are ensemble technique?
I was described a scenario where one might wish to detect some type of spike event on a timeline.
Mathematical modeling questions
In an undirected connected graph G = (N, A), an Euler tour is a walk that starts at some node, visits each arc exactly once, and returns to the starting node. A graph is Eulerian if it contains an Euler tour. Show that in an Eulerian graph, the degree of every node is even. Next, show that if every node in a connected graph has an even degree, the graph is Eulerian. Establish the second result by describing an O(m) algorithm for determining whether a graph is Eulerian and, if so, will construct an Euler tour. (Hint: Describe an algorithm that decomposes any graph with only even-degree nodes into a collection of arc-disjoint cycles, and then converts the cycles into an Euler tour.)
At the beginning of a dinner party, several participants shake hands with each other. Show that the participants that shook hands an odd number of times must be even in number.
Related to fundamentals of operations research
What does this sql query do? In the data, if X cannot change and Y depends on X, yet Y changes. How do you explain the change in Y? What assumptions would you build into a model predicting results of entry into the Asian market?
There were 3 rounds 1. Technical round- Questions on basics of Operations research were asked, basic coding questions and time complexity-based questions 2. Technical round- CV-based questions and Operations research algorithm. 3. HR round- known HR questions, case study type questions where OR solution is used.
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