Toast Software Engineer Intern Interview Questions and Answers

In genenal, apptitude, Puzzles, CS fundamentals

The interview involved coding questions based on java (easy).

Q1. How would you create a movie theatre booking system.
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Q2. What new innovative implementation will you do to the existing system.
Ans. 
I would implement a machine learning algorithm to optimize the system's performance and efficiency.
• Implementing a recommendation system to suggest personalized content to users based on their preferences and behavior.

• Integrating natural language processing to improve the system's ability to understand and respond to user queries.

• Utilizing predictive analytics to forecast future trends and make data-driven decisions for...read more
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Q1. Tell me about yourself.
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Q2. Where do you see yourself in 5 years.
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Q3. Questions on knowledge check on latest IT technologies like cloud and blockchain
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Basic java question were asked on inheritance etc

5 out of 3 questions has to be cleared

Q1. What are variables
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Q2. Difference between declaration and definition
Ans. 
Declaration is a statement that tells the compiler about the existence of a variable or function, while definition provides the actual implementation of the variable or function.
• Declaration introduces a name and its type to the compiler, while definition allocates memory for the variable or function.

• Declaration does not allocate memory, while definition does.

• Multiple declarations can exist for a single definition, but ...read more
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4 coding questions, 1 SQL coding question

Q1. Basic concepts of OOPs. Core Java questions. Method overloading, overriding. Hashmap implementation in Java.
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Q2. Primary key, Foreign key difference.
Ans. 
Primary key uniquely identifies a record, foreign key refers to a field in another table.
• Primary key is used to ensure uniqueness of a record in a table

• Foreign key is used to establish a relationship between two tables

• Primary key cannot be null, foreign key can be null

• Primary key is used as a reference in foreign key
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Q1. Interest in banking industry
Ans. 
I have a strong interest in the banking industry.
• I have studied finance and economics in college.

• I have completed internships at banks and financial institutions.

• I enjoy following the stock market and analyzing financial data.

• I am excited about the potential for technology to revolutionize banking.

• I believe that the banking industry plays a crucial role in the global economy.
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Q1. Write an algorithm to sort using bubble sort .. Write a flow chart to sort an array
Ans. 
Algorithm and flow chart for bubble sort on an array
• Compare adjacent elements and swap if necessary

• Repeat until no more swaps are needed

• Time complexity: O(n^2)

• Space complexity: O(1)
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Q2. Write a flow chart for sorting
Ans. 
A flow chart for sorting
• Start with an unsorted list

• Compare adjacent elements and swap if necessary

• Repeat until no more swaps are needed

• List is now sorted
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Round duration - 90 minutes
Round difficulty - Medium

Timing: 90 mins
Environment: Online coding round
No of questions: 3 Questions(225 marks) were asked.

Q1. 
Quick Sort Problem Statement
You are provided with an array of integers. The task is to sort the array in ascending order using the quick sort algorithm.
Quick sort is a divide-and-conquer algorithm. It ...read more
Ans. 
Yes, the quick sort algorithm can be enhanced to achieve NlogN complexity in the worst case by using randomized quick sort or median of three pivot selection.
• Use randomized quick sort to randomly select the pivot element, reducing the chances of worst-case scenarios.

• Implement median of three pivot selection to choose a pivot that is closer to the median value, improving partitioning efficiency.

• Consider using dual pivot...read more
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Q2. 
Find K'th Character of Decrypted String
You are given an encrypted string where repeated substrings are represented by the substring followed by its count. Your task is to find the K'th character of the d...read more
Ans. 
Given an encrypted string with repeated substrings represented by counts, find the K'th character of the decrypted string.
• Parse the encrypted string to extract substrings and their counts

• Iterate through the substrings and counts to build the decrypted string

• Track the position in the decrypted string to find the K'th character
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Q3. 
Weighted Job Scheduling Problem Statement
You have 'N' jobs, each with a start time, end time, and profit. Your task is to identify the maximum profit that can be earned by scheduling these jobs such that...read more
Ans. 
The Weighted Job Scheduling problem involves maximizing profit by scheduling non-overlapping jobs with given start times, end times, and profits.
• Sort the jobs by end time in ascending order.

• Initialize an array 'dp' to store maximum profit at each job index.

• For each job, find the latest non-overlapping job and update 'dp' with the maximum profit.

• Return the maximum profit from 'dp'.
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Round duration - 45 minutes
Round difficulty - Medium

Timing: evening
Environment: Virtual(remote)
Activity:
It was a resume screening + DSA round . There were 2 interviewers in this round. Initially , a brief introduction was given by them & later , they started with projects listed in my resume . They first asked me to explain about the projects , asked some questions related to its implementation & its actual use case in real world (where it can be used) .Later , they switched to DSA part , a total of 2 questions of easy medium difficulty level were asked . I only remember 1 question that was similar to Minimum platform problem.

After this , They asked me for favourite subjects. I said Operation Systems . Then , they asked for some concepts in OS , including CPU scheduling & its algos like Round robin , SJF etc and later asked which type of scheduling algorithm is used to design actual systems .

Q1. 
Minimum Number of Platforms Problem
Your task is to determine the minimum number of platforms required at a railway station so that no train has to wait.
Explanation:
Given two arrays:
• AT - represent...read more
Ans. 
Determine the minimum number of platforms needed at a railway station so that no train has to wait.
• Sort the arrival and departure times arrays in ascending order.

• Use two pointers to iterate through the arrays and keep track of the number of platforms needed.

• Increment the number of platforms needed when a train arrives and decrement it when a train departs.

• Return the maximum number of platforms needed at any point.

• Examp...read more
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Round duration - 50 minutes
Round difficulty - Medium

It was System design round.Though , it also started with a brief introduction & later , asked about projects . As my project was related to test classification . In that context , they asked me to design a low level Suggestion system(In any preferred language) .

Q1. 
Spell Checker Problem Statement
You are provided with a list of strings, DICTIONARY[], representing the correct spellings of words, and a query string QUERY that may contain misspelled words. Your task is...read more
Ans. 
Given a list of correct spellings and a query string, return a list of suggested correct spellings if the query is misspelled.
• Iterate through the dictionary to check for matching prefixes with the query string.

• If a match is found, add the corresponding word to the list of suggestions.

• Return the list of suggestions if the query is misspelled, otherwise return an empty list.
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