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leet-35.cpp
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leet-35.cpp
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/*
// 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) {
if (!head) return nullptr;
Node *dummy = head;
Node *res = nullptr;
while(head){
Node *temp = head->next;
Node *copy = new Node(head->val);
head->next = copy;
copy->next = temp;
head = temp;
}
head = dummy;
while(head) {
Node *copy = head->next;
copy->random = (head->random)? head->random->next : nullptr;
head = head->next->next;
}
head = dummy;
res = dummy->next;
while (head) {
Node *N = head->next;
// don't change orginal chain
head->next = head->next->next;
N->next = (N->next) ? N->next->next : nullptr;
head = head->next;
}
return res;
}
};