Citadel Software Developer Interview Questions and Answers

Round duration - 60 minutes
Round difficulty - Easy

The interviewer called my via phone and simultaneously provided me a link where I had to write the code for a given problem. It was scheduled at 12:30 pm, so timing was not an issue. It was a standard DP question involving a 2D matrix. The question was easy and I was able to code it within given time.

Round duration - 60 minutes
Round difficulty - Easy

The interviewer asked me two coding questions in this round.

Q1. Write an efficient program to find the sum of the contiguous subarray within a one-dimensional array of numbers that has the largest sum.
Ans. 
Efficient program to find sum of largest contiguous subarray within a one-dimensional array.
• Use Kadane's algorithm to find the maximum sum subarray in O(n) time complexity.

• Initialize max_sum and current_sum to 0, iterate through array updating current_sum and max_sum.

• Return max_sum as the result.
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Round duration - 60 minutes
Round difficulty - Easy

This was on-site round at their Bangalore office. The interviewer was friendly and helpful. The interview held inside a conference room.

Q1. 
DFS Traversal Problem Statement
Given an undirected and disconnected graph G(V, E), where V is the number of vertices and E is the number of edges, the connections between vertices are provided in the 'GR...read more
Ans. 
DFS traversal problem to find connected components in an undirected and disconnected graph.
• Use Depth First Search (DFS) algorithm to traverse the graph and find connected components

• Maintain a visited array to keep track of visited vertices

• Iterate through all vertices and perform DFS on unvisited vertices to find connected components
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Round duration - 60 minutes
Round difficulty - Easy

This was the next round of the onsite interviews. Took place in the same conference room as that of the previous round.

Round duration - 60 minutes
Round difficulty - Easy

This was the third round of the onsite interview. 
 

Q1. Objects in java 8
Ans. 
Java 8 introduced the concept of functional programming with the addition of lambda expressions and streams.
• Lambda expressions allow for concise code and easier parallel programming.

• Streams provide a way to work with collections of objects in a functional style.

• Functional interfaces like Predicate, Function, and Consumer are commonly used with lambda expressions.
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Q2. Spring boot basic concepts
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Q1. Coding challenge in java 8
Ans. 
Implement a coding challenge in Java 8
• Use lambda expressions and functional interfaces to write concise and readable code

• Utilize streams to process collections efficiently

• Leverage method references for cleaner code
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Q2. Personal project architecture questions
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It was data structures and algorithm

Q1. What is friend function
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Q2. Basic definitions of oops
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About 2 hours long interview in 3 sets one technical and 2 HR rounds

It was easy and main question wweer from mathr

Question from dsa cp segment tress

This round was a one-to-one coding round where the interviewer asked Leetcode Hard questions(2) DSA based questions. Also had to write and explain a few testcases, followed by managerial questions.