Quikr Associate Software Test Engineer Interview Questions and Answers

It was 2 coding questions of medium level

Q1. Longest substring with non repeating characters
Ans. 
Find the longest substring in a given string that does not contain any repeating characters.
• Use a sliding window approach to iterate through the string.

• Keep track of the characters seen so far using a set.

• Update the start and end indices of the window to find the longest substring.

• Return the length of the longest substring.
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Q2. Candy problem. There is similar question in geeks for geeks
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There were 2 questions to test our basic coding knowledge.

Q1. Some basic introduction followed by sort 2 arrays into a single array.
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Q1. Applications of various data structures.
Ans. 
Data structures are used in various applications like search algorithms, storage systems, and graph algorithms.
• Search algorithms like binary search use arrays and trees for efficient searching.

• Storage systems use data structures like hash tables and linked lists for organizing and accessing data.

• Graph algorithms like Dijkstra's algorithm use graphs and trees for solving complex problems.
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Q1. Some basic hr questions like tell me about yourself, what do you know about magicbricks,where do you see yourself in 5 years etc
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3 coding questions on codility platform.

DSA Round 3 questions

Q1. LLD and CS Funda
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Q1. Managerial Round
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Questions were crayon box ,the bot and the game and happy neighbourhood for 90 mins

Q1. Array basics was asked
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Q2. Segment tree,prefix sum
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Q1. Low level design was asked
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Implement your own state management in React and integrate it into a React application.

Q1. Questions on JavaScript, Mysql
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Q1. Questions on MySQL database
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Q1. Write a MySQL stored procedure
Ans. 
A MySQL stored procedure example
• Use CREATE PROCEDURE statement to define a new stored procedure

• Use BEGIN and END to enclose the procedure's code

• Use parameters to pass values into the procedure

• Use SELECT, INSERT, UPDATE, DELETE statements within the procedure
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Q2. How can indexing in MySQL
Ans. 
Indexing in MySQL improves query performance by creating efficient data structures.
• Indexes are created on columns in a table to speed up SELECT queries.

• Primary key columns are automatically indexed in MySQL.

• Indexes can be created using CREATE INDEX statement or by adding INDEX keyword in CREATE TABLE statement.

• Indexes can be unique or non-unique.

• Examples: CREATE INDEX idx_name ON table_name(column_name);

• Examples: CREAT...read more
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Q1. Write a code to to find out data and duplicate count from a array
Ans. 
Code to find data and duplicate count from an array of strings
• Iterate through the array and use a HashMap to store each element and its count

• Increment the count if the element is already present in the HashMap

• Finally, iterate through the HashMap to print out the elements and their counts
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Q1. Find the index of greatest number from the array?
Ans. 
To find the index of the greatest number in an array.
• Loop through the array and compare each element with the current greatest number. If the current element is greater, update the greatest number and its index.

• Use built-in functions like Math.max() and indexOf() to simplify the code.
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Q2. Sql question find the top 3 employess who have max salary ?
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Q1. Tell me something about yorself?
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Q2. Why you want to join justdial?
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