Lintcode-copy List with Random Pointer

Lintcode-copy List with Random Pointer

• Lintcode-copy List with Random Pointer
  • Web Link
  • Description
  • Code-c
  • Tips

Web Link

http://www.lintcode.com/en/problem/copy-list-with-random-pointer/

Description

A linked list is given such this each node contains an additional random pointer which could point to all node in the list or null.
Return a deep copy of the list.
-Challenge
Could you Solve it with O (1) space?

Code-c++

/** * Definition for singly-linked list with a random pointer. * struct RANDOMLISTNODE {* int label; * Random ListNode *next, *random; * Randomlistnode (int x): label (x), Next (null), random (null) {} *}; */Class Solution { Public:/** * @param head:the head of linked list with a random pointer.     * @return: A new head of a deep copy of the list. */    voidCopynext (Randomlistnode*Head) { while(Head!= NULL) {Randomlistnode*NewNode= NewRandomlistnode (head -label); NewNode -Random=Head -Random NewNode -Next=Head -Next Head -Next=NewNode; Head=Head -Next -Next }    }voidCopyrandom (Randomlistnode*Head) { while(Head!= NULL) {if(Head -Next -Random!= NULL) {Head -Next -Random=Head -Random -Next } head=Head -Next -Next }} Randomlistnode*Splitlist (Randomlistnode*Head) {Randomlistnode*Newhead=Head -Next while(Head!= NULL) {Randomlistnode*Temp=Head -Next Head -Next=Temp -Next Head=Head -Nextif(Temp -Next!= NULL) {Temp -Next=Head -Next }        }returnNewhead; } Randomlistnode*Copyrandomlist (Randomlistnode*Head) {//Write your code here        if(Head== NULL) {return NULL;        } copynext (head); Copyrandom (head);returnSplitlist (head); }};

Tips:

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Lintcode-copy List with Random Pointer