Kaleidofin Softwaretest Engineer Interview Questions and Answers

2 Codes on Hackerrank

Q1. Questions on Tree
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Q2. Questions on Java
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Q1. Hiring Manager Round
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2 questions. 1 was basic level. 2 was of medium level.

Q1. An ambiguous problem statement was given. Asking relevant questions revealed the problem to be largest island in a binary matrix. Was asked to code on an ide. And reduce space complexity to O(1).
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Q2. Maximum sum path from root to leaf in an N-ary tree. Was asked to design an appropriate data structure. Then code the solution in O(n) time and O(1) space.
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Q1. Through discuss of projects. Methods used.
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Q2. First missing positive number in an array of integer in O(n) time O(1) space.
Ans. 
Find first missing positive number in an array in O(n) time and O(1) space.
• Traverse the array and mark the presence of each positive integer by changing the sign of the corresponding index.

• Traverse the array again and return the index of the first positive integer.

• If all integers are present, return the length of the array + 1.

• Example: [3, 4, -1, 1] => mark 3rd and 4th index as negative => return 2.

• Example: [1, 2, 0] =...read more
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Q3. Given an integer, print the relevant column name in an excel sheet. Ex: 1- A , 2-B.......... 26-Z , 27-AA, 28-AB........ Was asked code on an ide and test cases were given.
Ans. 
Given an integer, print the relevant column name in an excel sheet.
• Create a string array of alphabets from A to Z

• Use modulo operator to get remainder and divide by 26 to get quotient

• Append the corresponding alphabet to the result string

• Reverse the result string
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Q1. What are your salary expectations?
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Maths,quant for 1 hour duration

Arrays, strings, linked list, palindrome

Q1. Leet code easy to medium level 4 questions
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Q1. Had a walk through of last round problems n new problem on graph
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Q1. This round was with a manager , who asked about my current company projects and architecture
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Q1. This round was for negotiations
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Q1. Types of REST API methods?
Ans. 
Types of REST API methods include GET, POST, PUT, DELETE, PATCH, and more.
• GET - Retrieve data from a server

• POST - Create new data on a server

• PUT - Update existing data on a server

• DELETE - Remove data from a server

• PATCH - Partially update data on a server
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Q1. 3 sum problem and number of operations required to make 2 strings same
Ans. 
3 sum problem involves finding 3 numbers in an array that add up to a target sum. Number of operations to make 2 strings same involves finding the minimum number of operations (insert, delete, replace) needed to transform one string into another.
• For 3 sum problem, use a hashmap to store complements of each number and check if the complement exists in the hashmap while iterating through the array.

• For number of operation...read more
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Q1. Nearby app machine coding
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Q1. Project and practices followed and hld for inshort
Ans. 
I have experience working on projects using high-level design (HLD) practices.
• Utilized UML diagrams to create HLD for projects

• Followed industry best practices for software design

• Collaborated with team members to ensure HLD aligns with project goals
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90 min long test, with 4 coding questions on data structures and algorithms, 2 of them being the medium and other medium-hard.

Q1. Distinct subsequences, leetcode problem link: leetcode.com/problems/distinct-subsequences
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