Fareportal Senior Test Engineer Interview Questions and Answers

Basic coding test from hackerearth.

Q1. Sort colours or the dutch flag problem
Ans. 
The Dutch Flag problem involves sorting an array of strings with three possible values in a specific order.
• Create three pointers to keep track of the boundaries of each color group

• Iterate through the array and swap elements to group them in the correct order

• Time complexity of O(n) can be achieved by a single pass through the array
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Mettle Test based on DP based approach

Q1. Based on Tree, Graph, Segment Tree
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Q1. DS algo based on DP, Trees, Graphs
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Q1. Systed Design Round 1
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Q2. Design a Distributed Queue to have functionality similar to Kafka.
Ans. 
Design a distributed queue similar to Kafka.
• Use a distributed architecture with multiple brokers and partitions.

• Implement a publish-subscribe model for producers and consumers.

• Ensure fault tolerance and high availability through replication and leader election.

• Use a log-based storage system for messages and offsets.

• Provide support for message ordering and retention policies.

• Implement a scalable and efficient message de...read more
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Q3. Design Price Tagger System
Ans. 
Design a Price Tagger System
• Identify the products to be tagged with prices

• Determine the pricing strategy (e.g. cost-plus, value-based, etc.)

• Choose the appropriate tagging technology (e.g. barcode, RFID, etc.)

• Develop a user-friendly interface for tagging and updating prices

• Implement a database to store product and pricing information

• Integrate with point-of-sale systems for accurate pricing at checkout
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Q1. Rotate array leetcode question
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Q2. Longest palindormic substring
Ans. 
A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward.
• Use dynamic programming to solve this problem efficiently.

• Iterate through the string and expand around each character to find the longest palindrome.

• Consider both odd and even length palindromes.

• Example: Input 'babad', Output 'aba' or 'bab'.
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Q1. Print all the subsequences of a string
Ans. 
Generate all possible subsequences of a given string.
• Use recursion to generate all possible combinations of characters in the string.

• At each step, include or exclude the current character to form subsequences.

• Store each subsequence in an array of strings.
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Q2. Print longest substring with k unique values
Ans. 
Find and print the longest substring with k unique characters in an array of strings.
• Iterate through the array of strings and keep track of the longest substring with k unique characters.

• Use a sliding window approach to efficiently find the longest substring.

• Keep a hashmap to store the frequency of characters in the current window.

• Update the window boundaries based on the number of unique characters.

• Return the longest
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Q1. Behaviour quesions
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Q1. Rain water problem
Ans. 
The rain water problem involves calculating the amount of rainwater that can be trapped between buildings or structures.
• Calculate the maximum height of water that can be trapped at each position

• Subtract the height of the building at each position to get the water level

• Sum up the water levels at each position to get the total amount of trapped rainwater
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Q2. 2 sum problemjijo
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Q1. Design Search Systems
Ans. 
Designing search systems involves creating efficient algorithms and data structures to quickly retrieve relevant information.
• Understand the data structure of the search system (e.g. inverted index, trie)

• Implement efficient search algorithms (e.g. binary search, hash tables)

• Consider scalability and performance optimization techniques (e.g. caching, indexing)

• Include user-friendly features like autocomplete and spell corr...read more
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The written test consisted of two DS programs.

1 hour in testing problem solving and basic math

Coding round with graph and tree questions