Fukoku Interview Questions and Answers

Program to create a copy of a doubly linked list with an arbit pointer.

• Traverse the original list and create a new node for each node in the list.

• Store the mapping of original node to the new node in a hash table.

• Traverse the original list again and set the next and arbit pointers of the new nodes.

• Return the head of the new list.

Implement functionality for online test with timer and handle power failure scenarios

• Create a timer function to track the time

• Store the start time and end time of the test

• Implement a backup system to save progress in case of power failure

• Use a database to store test data and progress

• Handle edge cases like internet connectivity issues

It is not possible to stop man in the middle attack over an insecure communication line without using any kind of encryption.

• Without encryption, the communication line is inherently insecure and vulnerable to man-in-the-middle attacks.

• One possible solution is to use a secure communication line, such as a VPN or a dedicated private network.

• Another solution is to use digital signatures to verify the authenticity of the communication.

• However, these solutions are not foolproof an...read more

Heap and stack memory are two types of memory allocation in a program. Local variables are stored in stack memory. Memory tables are used to track memory allocation.

• Heap memory is used for dynamic memory allocation, while stack memory is used for static memory allocation.

• Local variables are stored in stack memory and are only accessible within the scope of the function they are declared in.

• Memory tables are used to keep track of memory allocation and deallocation in a program...read more

HTTP is unsecured while HTTPS is secured with SSL/TLS encryption.

• HTTP stands for Hypertext Transfer Protocol while HTTPS stands for Hypertext Transfer Protocol Secure.

• HTTP operates on port 80 while HTTPS operates on port 443.

• HTTP is unencrypted while HTTPS is encrypted with SSL/TLS.

• HTTPS provides authentication and data integrity while HTTP does not.

• HTTPS is used for secure online transactions such as online banking, e-commerce, etc.

A recursive function to check if a number is prime or not.

• Create a function that takes a number as input.

• Check if the number is less than 2, return false.

• Check if the number is 2, return true.

• Check if the number is divisible by any number less than it, return false.

• If none of the above conditions are met, call the function recursively with the number minus 1.

To reverse a linked list, we need to traverse the list and change the direction of the pointers.

• Create three pointers: prev, curr, and next

• Initialize prev to null, curr to head of the linked list, and next to null

• Traverse the list and change the direction of the pointers: next = curr.next; curr.next = prev; prev = curr; curr = next;

• Set the new head of the linked list to prev