Jio Senior Android Developer Interview Questions and Answers

Q1. How to optimise fetching 1 lakh entries from db
Ans. 
Use pagination, indexing, caching, and query optimization to fetch 1 lakh entries efficiently from the database.
• Implement pagination to fetch data in smaller chunks

• Create indexes on columns frequently used in queries

• Use caching to store frequently accessed data

• Optimize queries by avoiding unnecessary joins and using appropriate indexes

• Consider using database-specific optimizations like query hints or stored procedures
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Coding round with 3 DSA questions and a few MCQs on aptitude.

Q1. Interviewer asked questions on DSA.
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Q1. The interviewer asked general questions on DSA.
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Round duration - 90 minutes (60 minutes for coding and 30 minutes for MCQs)
Round difficulty - Medium

The test was conducted in the evening from 7:00 pm to 8:30 pm. Because of the covid situation, the test was online and was given by all the students from their home. 
Login window of 15 minutes was given and all students were supposed to login within initial 15 minutes (between 7:00 and 7:15 pm). The test was conducted on AMCAT and webcam was on during the whole test duration.
There were two sections in the test: 1.) Coding round with 2 coding questions - 60 minutes (2.) MCQ round with 30 MCQs - 30 minutes
120 students appeared for this round and 20 were shortlisted for further process.

Q1. 
Character Frequency Problem Statement
You are given a string 'S' of length 'N'. Your task is to find the frequency of each character from 'a' to 'z' in the string.
Example:
Input:
S : abcdg
Output:
1...read more
Ans. 
Given a string, find the frequency of each character from 'a' to 'z' in the string.
• Create an array of size 26 to store the frequency of each character from 'a' to 'z'.

• Iterate through the string and increment the count of the corresponding character in the array.

• Print the array of frequencies as the output for each test case.
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Q2. 
Longest Common Prefix After Rotation
You are given two strings 'A' and 'B'. While string 'A' is constant, you may apply any number of left shift operations to string 'B'.
Explanation:
Your task is to calcu...read more
Ans. 
Calculate the minimum number of left shift operations needed to achieve the longest common prefix between two strings.
• Apply left shift operations to string B to find the longest common prefix with string A

• Count the number of left shifts needed to achieve the longest common prefix

• Return the minimum number of left shift operations for each test case
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Round duration - 50-60 minutes
Round difficulty - Medium

This round started at 11 am and went till 3 pm. 
Out of 120 students that appeared in online coding test, 20 were shortlisted for the first round of interviews.
In this round, everyone was asked some moderate level coding questions. We were supposed to write the code in our IDE, present the screen and show the interviewer the output of our code.
The interview started with the introduction being followed by 2 coding problems.

Q1. 
Longest Subarray with Zero Sum
Ninja enjoys working with numbers, and as a birthday challenge, his friend provides him with an array consisting of both positive and negative integers. Ninja is curious to ...read more
Ans. 
Find the length of the longest subarray with zero sum in an array of integers.
• Iterate through the array and keep track of the running sum using a hashmap.

• If the running sum is seen before, the subarray between the current index and the previous index with the same sum is a subarray with zero sum.

• Update the length of the longest subarray with zero sum as you iterate through the array.

• Example: For arr1 = [1, -1, 3, 2, -2...read more
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Round duration - 20 minutes
Round difficulty - Medium

7 students were shortlisted for the HR round. This round started at 7:30 pm and went till 8:30 pm.
Like all the other rounds, this round too was virtual (on google meet). In the beginning, the interviewer introduced himself and then asked questions based on my resume.
All the 7 candidates were selected in the HR round.

Q1. Sql related ques mege into, rank,dense rank,queries of joins etc.
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Q2. Java 8 related ques optional and stream
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Q1. Explain yourself
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Programming easy question to understand your logical thinking.

Q1. What are your salary expectations?
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Q2. What is your family background?
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Q3. What are your strengths and weaknesses?
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Q4. Tell me about yourself.
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