Multiply Linked Lists Problem Statement

Your task is to multiply two numbers represented as linked lists and return the resultant multiplied linked list.

Explanation:

The multiplied list should be a linked list representation of the product of the two numbers. Each node contains a single digit.

Input:

The first line contains an integer T, the number of test cases. For each test case, the first line contains elements of the first linked list, separated by spaces and terminated by -1. The second line contains elements of the second linked list, separated by spaces and terminated by -1.

Output:

For each test case, print the linked list representing the product, with elements single-space separated and terminated by -1.

Example:

Input:

2 3 4 2 -1 4 6 5 -1 5 6 -1 7 8 9 -1

Output:

1 5 8 1 0 -1 4 4 2 0 4 -1

Constraints:

1 ≤ T ≤ 10

1 ≤ N, M ≤ 100

0 ≤ data ≤ 9 for any node in the list

Time Limit: 1 sec

Note:

You are not required to print anything; it has already been handled. Implement the function as instructed.

Question

Multiply Linked Lists Problem Statement

Your task is to multiply two numbers represented as linked lists and return the resultant multiplied linked list.

Explanation:

The multiplied list should be a linked list representation of the product of the two numbers. Each node contains a single digit.

Input:

The first line contains an integer T, the number of test cases.
For each test case, the first line contains elements of the first linked list, separated by spaces and terminated by -1.
The second line contains elements of the second linked list, separated by spaces and terminated by -1.

Output:

For each test case, print the linked list representing the product, with elements single-space separated and terminated by -1.

Example:

Input:

Output:

1 5 8 1 0 -1
4 4 2 0 4 -1

Constraints:

1 ≤ T ≤ 10
1 ≤ N, M ≤ 100
0 ≤ data ≤ 9 for any node in the list
Time Limit: 1 sec

Note:

You are not required to print anything; it has already been handled. Implement the function as instructed.

Accepted Answer

Multiply two numbers represented as linked lists and return the resultant multiplied linked list.

Create a function that takes two linked lists as input and returns the product as a linked list
Traverse both linked lists to extract the numbers, multiply them, and create a new linked list for the product
Handle carry over while multiplying digits and adding to the result linked list

Accepted Answer

class solution {
public:
    long long multiplyTwoLists(Node *first, Node *second) {
        const long long mod = 1000000007; // 1e9 + 7
        long long n1 = 0;
        long long n2 = 0;
        
        Node* temp1 = first;
        Node* temp2 = second;
        
        while(temp1) {
            n1 = (n1 * 10 + temp1->data) % mod;
            temp1 = temp1->next;
        }
        
        while(temp2) {
            n2 = (n2 * 10 + temp2->data) % mod;
            temp2 = temp2->next;
        }
        
        return (n1 * n2) % mod;
    }
};

Asked in Josh Technology Group