Leetcode138. 随机链表的复制 -hot100

题目：

代码(首刷看解析 2024年3月5日）：

/*
// Definition for a Node.
class Node {
public:
    int val;
    Node* next;
    Node* random;
    
    Node(int _val) {
        val = _val;
        next = NULL;
        random = NULL;
    }
};
*/
 
class Solution {
public:
    Node* copyRandomList(Node* head) {
        unordered_map<Node*, Node*> OriMap;
        Node* cur = head;
        while (cur) {
            OriMap[cur] = new Node(cur->val);
            cur = cur->next;
        }
 
        cur = head;
        while (cur) {
            OriMap[cur]->next = OriMap[cur->next];
            OriMap[cur]->random = OriMap[cur->random];
            cur = cur->next; 
        }
        return OriMap[head];      
    }
};