Software Developer

Construct a 2D array of size (m+1) x (n+1), where m and n are the sizes of the two strings. This array will help in tabulating intermediate results to avoid re-computation.

Initialize the first row and the first column of the array to 0, because an empty string has an LCS length of 0 with any string.

For each character in the first string (from left to right) and for each character in the second string (from top to bottom):

If the characters match, the value at that cell in the array will be 1 plus the value of the cell diagonally up and to the left. This is because we have found a common character, so we increment our count.
If the characters do not match, the value at that cell in the array will be the maximum of the value in the cell directly above and the value in the cell directly to the left. This is because we are trying to find the maximum length of the subsequence, so we take the maximum of the two possibilities.
After filling the entire array, the bottom-right cell of the array will contain the length of the LCS. This is because it contains the count of the maximum matching characters considering all characters in both strings.

Step 1: Understand the Problem

Imagine you have to pay someone an exact amount of money and you have coins of different values. The problem is to figure out how many different ways you can use these coins to pay that exact amount.

Step 2: Plan Your Approach

To solve this, we'll make a list. This list will keep track of the number of different ways we can make each amount up to our target amount, using the coins we have.

Step 3: Implement the Solution

Finally, we write a program that goes through our list, and for each amount, it figures out the number of ways we can pay that amount using the coins. It does this by adding the ways to make the amount without the current coin and the ways to make the amount with the current coin. In the end, the last number in our list tells us the total ways we can pay the target amount using our coins.

Tip 1: Just give a simple definition or the way you learned it.
Tip 2: Be confident.

Tip 1: The same goes for this question also.
Tip 2: Just try to listen to the interviewer first.

Create Node Struct: First, a structure named 'Node' is defined. This structure has two members, an integer to hold the data, and a Node pointer to point to the next node in the list.

Define Append Function: The append function is declared with two parameters: a double pointer to the head node, and the data for the new node.

Allocate New Node: Inside the append function, a new node is created using dynamic memory allocation. The data part is set to the passed data, and the next part is set to point to the head. This is because, in a circular linked list, the last node always points to the head.

Empty List Case: If the list is empty (i.e., the head is NULL), then the new node itself becomes the list, pointing to itself.

Find Last Node: If the list is not empty, then the function iterates through the list to find the last node (i.e., a node whose next is pointing to the head).

Insert New Node: Finally, the last node's 'next' is updated to point to the new node, thereby appending the new node to the end of the list.

Main Function: In the main function, the append function is called several times to insert nodes into the list. The list is then printed by traversing from the head node until we reach the head node again.