Unthinkable Solutions Interview Questions, Process, and Tips

String , Array, Largest subarray with sum 0

Q1. Largest Area of Histogram
Ans. 
The largest area of a histogram can be found by calculating the maximum area of rectangles formed by the histogram bars.
• Calculate the area of rectangles formed by each bar and find the maximum area.

• Consider the width of the rectangle as the number of consecutive bars with height greater than or equal to the current bar.

• Example: For histogram [2,1,5,6,2,3], the largest area would be 10 (5*2).
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The round was done on google form, where students were given 1 hour to solve some aptitude questions.

There were 3 coding questions which required basic programming knowledge. Anyone who did all 3 skipped another coding round to direct interview.

Q1. Project Related questions were there. For example I had projects related to Machine Learning so I was asked about various activations functions, Algorithms, etc.
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Q2. Reverse a linked list.
Ans. 
Reverse a linked list by changing the pointers direction.
• Start with three pointers: current, previous, and next.

• Iterate through the linked list, updating the pointers to reverse the direction.

• Update the head of the linked list to be the previous node once the end is reached.
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Q3. Write a sql query to join two tables and find some data from one table.
Ans. 
SQL query to join two tables and retrieve data from one table.
• Use JOIN keyword to combine tables based on a related column

• Specify the columns to retrieve using SELECT statement

• Add conditions using WHERE clause if needed
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It was a DSA round which consisted of three questions.
1)longest substring without repeating characters
2)largest subarray with sum 0
3)String based question

Q1. 1)Largest Area of Histogram
Ans. 
The largest area of a histogram is the maximum area that can be enclosed by a rectangle within the histogram bars.
• Calculate the largest area of a histogram by finding the maximum area of rectangles that can be formed within the histogram bars.

• This can be done by iterating through each bar and calculating the area of rectangles that can be formed with that bar as the height.

• Keep track of the maximum area found so far an...read more
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Q2. Minimum effort in an array
Ans. 
Find the string with minimum length in an array of strings.
• Iterate through the array and keep track of the minimum length string

• Return the string with the minimum length
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Java Programming and core java along with DSA

Q1. Define Constructors
Ans. 
Constructors are special methods in a class that are used to initialize objects.
• Constructors have the same name as the class they belong to.

• They are called automatically when an object of the class is created.

• Constructors can have parameters to initialize the object with specific values.

• Example: public class Car { public Car(String color) { this.color = color; }}
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Q2. Define Oops pillars
Ans. 
Oops pillars refer to the four main concepts of object-oriented programming: Inheritance, Encapsulation, Polymorphism, and Abstraction.
• Inheritance: Allows a class to inherit properties and behavior from another class.

• Encapsulation: Bundling data and methods that operate on the data into a single unit.

• Polymorphism: Ability of a function to behave differently based on the object it is acting upon.

• Abstraction: Hiding the ...read more
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