StockX Interview Questions and Answers

Q1. SQL and Python data analysis type questions
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Round duration - 90 minutes
Round difficulty - Medium

The online round was conducted on Hackerearth around 11:30 PM 
This round was an online coding plus MCQ round which includes 15 MCQ with positive 4 and negative 1 and 3 coding questions with two questions 10 marks and one was of 20 marks . MCQ were easy to medium and covers all the topic of Networks OOPS DBMS and CPP/JAVA 
In Coding section one 20 marks question was medium and two 10 marks were of easy level, like if you practice regularly you can crack two 10 marks means you can score 20 marks out of 40 in coding

Q1. 
Reach the Destination Problem Statement
You are given a source point (sx, sy) and a destination point (dx, dy). Determine if it is possible to reach the destination point using only the following valid mo...read more
Ans. 
The problem involves determining if it is possible to reach a destination point from a source point using specified moves.
• Iterate through each test case and check if destination is reachable from source using specified moves

• Implement a recursive function to simulate the moves and check if destination is reached

• Consider constraints to optimize the solution

• Example: For input (1, 1, 3, 5), the output should be true as des
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Q2. 
Ways To Make Coin Change
Given an infinite supply of coins of varying denominations, determine the total number of ways to make change for a specified value using these coins. If it's not possible to make...read more
Ans. 
The task is to find the total number of ways to make change for a specified value using given denominations.
• Use dynamic programming to solve this problem efficiently.

• Create a 1D array to store the number of ways to make change for each value from 0 to the target value.

• Iterate through the denominations and update the array based on the current denomination.

• The final answer will be the value at the target index of the ar
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Q3. 
Min Jumps Problem Statement
In Ninja town, represented as an N * M grid, people travel by jumping over buildings in the grid's cells. Santa is starting at cell (0, 0) and must deliver gifts to cell (N-1, ...read more
Ans. 
Santa needs to find the quickest path to deliver gifts in Ninja town by jumping over buildings with least travel time.
• Santa starts at (0, 0) and needs to reach (N-1, M-1) on Christmas Eve.

• Santa can jump to (x+1, y+1), (x+1, y), or (x, y+1) from any cell (x, y).

• Travel time between two buildings equals the absolute difference in their heights.

• Find the quickest path with least travel time.

• Example: For grid [[1, 3, 5], [2,
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Round duration - 50 minutes
Round difficulty - Medium

It was a technical interview which was scheduled on 16th October 2020 at 10:00 AM 
This round mainly focus on your DSA, DBMS , OS Networking and coding skills like how optimised you can write code 
This round was conducted on Zoom 
Their were 2 interviewers and both of them were very calm and supportive

Q1. 
Pythagorean Triplets Detection
Determine if an array contains a Pythagorean triplet by checking whether there are three integers x, y, and z such that x² + y² = z² within the array.
Input:
The first lin...read more
Ans. 
Detect if an array contains a Pythagorean triplet by checking if there are three integers x, y, and z such that x^2 + y^2 = z^2.
• Iterate through all possible triplets of numbers in the array and check if they form a Pythagorean triplet.

• Use a nested loop to generate all possible combinations of three numbers from the array.

• Check if the sum of squares of two numbers is equal to the square of the third number for each trip...read more
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Q2. 
Cycle Detection in a Singly Linked List
Determine if a given singly linked list of integers forms a cycle or not.
A cycle in a linked list occurs when a node's next points back to a previous node in the ...read more
Ans. 
Detect if a singly linked list forms a cycle by checking if a node's next pointer points back to a previous node.
• Use Floyd's Tortoise and Hare algorithm to detect a cycle in the linked list.

• Maintain two pointers, one moving at twice the speed of the other.

• If there is a cycle, the two pointers will eventually meet.

• If one of the pointers reaches the end of the list (null), there is no cycle.
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Round duration - 10 minutes
Round difficulty - Easy

This was the HR round conducted online through ZOOM on 16th October 2020 around 4:00 PM
There were two interviewers and both were quite good and frank 
This round mainly focus on basic resume questions and about yourself

Very impressive able to solve 100 coding questions within 10 mins

Q1. Find min in array
Ans. 
Find the minimum string in an array of strings.
• Iterate through the array and compare each string to find the minimum.

• Use a built-in function like sort() to sort the array and then return the first element.

• Consider using a loop to compare each element with the current minimum.
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Q2. Find max in array
Ans. 
Find the maximum value in an array of strings.
• Convert the strings to numbers if needed before finding the maximum value.

• Use a loop to iterate through the array and compare each element to find the maximum value.
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Some coding question about optimization algorthim

Q1. Basic array question
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Q1. Find the first circular tour that visits all petrol pumps
Ans. 
The first circular tour that visits all petrol pumps can be found using the concept of a circular linked list.
• Create a circular linked list with each node representing a petrol pump

• Calculate the difference between petrol available at each pump and the distance to the next pump

• Start from a pump where the sum of differences is positive and traverse the circular linked list until completing the tour
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First round was a aptitude test of 25 question

Q1. Oops concept in java
Ans. 
Oops concept in Java refers to Object-Oriented Programming principles like inheritance, encapsulation, polymorphism, and abstraction.
• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation involves bundling data and methods that operate on the data into a single unit.

• Polymorphism allows objects to be treated as instances of their parent class.

• Abstraction hides the implementation d...read more
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Q2. Basic multi threading questions
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Q1. Code to make a pattern and explain each and every line of code
Ans. 
Code to create a pattern and explain each line of code
• Start by defining the number of rows and columns in the pattern

• Use nested loops to iterate through each row and column

• Decide the pattern you want to create and use conditional statements to determine the output for each position
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Q2. Puzzle: In how many minimum cut u can cut a cake in 8 piece
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