Carelon Global Solutions Senior Test Engineer 2 Interview Questions and Answers

Use Dijkstra's algorithm to find the shortest path between 2 vertices in a graph.

• Implement Dijkstra's algorithm to find the shortest path

• Create a priority queue to keep track of the vertices with the shortest distance

• Use a visited set to avoid revisiting vertices

• Stop when the destination vertex is reached

• Return the shortest path found

• Example: finding the shortest path between A and D in a graph with weighted edges: A->...read more

Find pairs in an array with sum equal to 0.

• Use a hash table to store the frequency of each element.

• Iterate through the array and for each element, check if its complement (negative value) exists in the hash table.

• If it exists, add the frequency of the complement to the count of pairs.

• Return the count of pairs.

• Example: array = [2, -2, 3, 0, -3], pairs = 2 (-2, 2 and -3, 3)

Design a traffic signal system

• Identify the number of lanes and intersections

• Determine the traffic flow and peak hours

• Choose appropriate sensors and controllers

• Implement a synchronization algorithm

• Consider emergency vehicle prioritization

• Include pedestrian crossing signals

• Ensure compliance with local regulations

Hashmap is a data structure that stores key-value pairs and provides constant time complexity for insertion, deletion, and retrieval.

• Hashmap uses hashing function to map keys to indices in an array

• Collisions can occur when multiple keys map to the same index, which can be resolved using separate chaining or open addressing

• Java implementation: HashMap map = new HashMap<>();

Printing patterns using code

• Identify the pattern to be printed

• Use loops to print the pattern

• Adjust the loop variables to control the pattern

• Use conditional statements to modify the pattern

• Examples: printing stars, triangles, squares, etc.

Common point in linked list refers to the node where two or more linked lists intersect.

• The common point can be found by traversing both linked lists and comparing the nodes.

• The common point can also be found by using two pointers, one for each linked list, and moving them until they meet at the common point.

• Examples include finding the intersection point of two linked lists or finding the loop in a linked list.

Learning programming languages is important for software engineers to effectively communicate with computers and develop software solutions.

• Programming languages are the foundation of software development.

• Learning multiple languages expands the range of problems a software engineer can solve.

• Different languages have different strengths and are suited for different tasks.

• Knowing multiple languages improves adaptability ...read more