Top-Interview-Questions-LeetCode/Copy_list.cpp at main · PRAN20/Top-Interview-Questions-LeetCode · GitHub

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class Solution {
public:
    Node* copyRandomList(Node* head) {
        if(!head) return NULL;

        Node* temp = head;

        while(temp){
            Node* node = new Node(temp->val);
            node->next = temp->next;
            temp->next = node;
            temp = node->next;
        }

        temp = head;
        while(temp){
            temp->next->random = (temp->random)?temp->random->next:NULL;
            temp = temp->next->next;
        }

        Node* ans = head->next;
        temp = head->next;
        while(head){
            head->next = temp->next;
            head = head->next;
            if(!head) break;
            temp->next = head->next;
            temp = temp->next;
        }
        return ans;
    }
};