10+ Indigo Paints Interview Questions and Answers

Modify a matrix by setting entire row and column to 1 if an element is 1, then count the number of 1s.

• Iterate through the matrix to find elements with value 1

• Use two arrays to keep track of rows and columns to be modified

• Update the matrix by setting entire row and column to 1 if an element is 1

• Count the number of 1s in the modified matrix

Given a sorted N * N matrix, find the position of a target integer X.

• Iterate over each row and column to search for the target integer

• Utilize the sorted nature of the matrix to optimize the search process

• Return the position of the target integer if found, else return -1 -1

Sort an array of strings based on a new alphabetical order starting with a given character.

• Iterate through the array of strings and compare each string with the given character to determine the new order.

• Implement a custom comparator function to sort the strings based on the new alphabetical order.

• Use built-in sorting functions in programming languages like Python, Java, or C++ to efficiently sort the array.

Euler's Totient Function calculates count of integers coprime to N between 1 and N.

• Implement Euler's Totient Function to calculate count of coprime integers to N.

• Use the formula: phi(N) = N * (1 - 1/p1) * (1 - 1/p2) * ... * (1 - 1/pk) where p1, p2, ..., pk are prime factors of N.

• Example: For N = 9, phi(9) = 9 * (1 - 1/3) = 6.

The pillars of OOP are Inheritance, Encapsulation, Abstraction, and Polymorphism.

• Inheritance allows a class to inherit properties and behavior from another class.

• Encapsulation restricts access to certain components of an object, protecting its integrity.

• Abstraction hides complex implementation details and only shows the necessary features.

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

The doctor is the son's mother.

• The doctor is a woman, who is the mother of the son.

• The question challenges gender stereotypes.

• The answer highlights the need for diversity and inclusivity in all fields.

• Similar scenarios can occur in other professions where assumptions are made based on gender.

One person picked the egg with another egg inside.

• One of the eggs had another egg inside

• One person picked the egg with another egg inside

• The basket still contains 1 egg because the egg with another egg inside was picked

The two sons were born in different time zones.

• The mother gave birth to the first son in one time zone and then traveled to another time zone where she gave birth to the second son.

• The time difference between the two time zones is such that the two sons were born at the same hour, same day, same year.

• For example, if the first son was born at 11 pm on January 1st in New York, and the mother traveled to Los Angeles where the time is 3 hours behind, the second son would be born ...read more

The question is about the common header file in C++.

• The header file is used for input/output operations in C++.

• It provides classes like cin and cout for reading and writing data.

• It also includes classes for file input/output operations like ifstream and ofstream.

• The header file can be included in a C++ program using the #include directive.