Adboxers Interview Questions and Answers

You can turn on one switch for a few minutes, turn it off and turn on another switch. The remaining switch will be for the third bulb.

• Turn on switch 1 and leave it on for a few minutes

• Turn off switch 1 and turn on switch 2

• Leave switch 2 on for a few minutes

• Turn off switch 2 and turn on switch 3

• The bulb that is off and warm to the touch is connected to switch 1

• The bulb that is on is connected to switch 2

• The bulb that is off and cold to the touch is connected to switch 3

Cake can be cut into 8 equal pieces by making 3 cuts.

• Make two cuts to divide the cake into quarters, then make a third cut through all quarters to get 8 equal pieces.

• Each cut should be made perpendicular to the previous cut.

• The size of the cake does not matter as long as it is a cylindrical or rectangular shape.

Singleton design pattern ensures only one instance of a class is created and provides a global point of access to it.

• Create a private constructor to prevent direct instantiation of the class

• Create a private static instance of the class

• Create a public static method to access the instance

• Ensure thread safety by using synchronized keyword or static initialization block

• Example: Database connection manager

Sort a list of alphanumeric values.

• Use a sorting algorithm to sort the array of strings.

• If the values are case-insensitive, convert them to lowercase before sorting.

• If the values contain numbers, use a natural sorting algorithm to sort them.

• If the values contain special characters, consider their ASCII values while sorting.

Reverse a linked list

• Iteratively swap the next and previous pointers of each node

• Recursively swap the next and previous pointers of each node

• Use a stack to push each node and then pop them to create the reversed list