03. Decimal Equivalent of Binary Linked List

The problem can be found at the following link: Question Link

My Approach

  • I am iterating through the linked list, treating it as a binary representation of a number.

  • At each step, I shift the current result left by one bit (multiply by 2) and add the current node's data.

  • I also take care to update the result modulo 1e9 + 7 to avoid overflow.

Time and Auxiliary Space Complexity

  • Time Complexity : O(N), where N is the number of nodes in the linked list.

  • Auxiliary Space Complexity : O(1)

Code (C++)

class Solution {
public:
    long long unsigned int decimalValue(Node *head)
    {
        long long unsigned int out = 0, mod = 1e9 + 7;
        Node* temp = head;

        while (temp) {
            out = (out << 1) % mod;
            out = (out + temp->data) % mod;
            temp = temp->next;
        }

        return out;
    }
};

Contribution and Support

For discussions, questions, or doubts related to this solution, please visit our discussion section. We welcome your input and aim to foster a collaborative learning environment.

If you find this solution helpful, consider supporting us by giving a ⭐ star to the getlost01/gfg-potd repository.

Last updated