Lintcode Easy title: Partition List Link List Division

Topic:

Chain List Division

Given a single-linked list and a numeric x, the list is divided so that all nodes less than x are ranked before nodes greater than or equal to X.

You should keep the relative order of the linked list nodes in the two parts.

Sample Example

Given the list 1->4->3->2->5->2->null, and x=3

Back to 1->2->2->4->3->5->null

Solving:

The result of the above return is a lot of wrong should be: 1->2->2->3->4->5->null

Think for a long time do not know how to do, nine chapters to see the program, unexpectedly make two chain links to connect up ...

Java Program:

/*** Definition for ListNode. * public class ListNode {* int val; * ListNode Next; * ListNode (int val) {* This.val = val; * This.next = null; *     } * } */  Public classSolution {/**     * @paramhead:the first node of linked list. * @paramX:an Integer *@return: a ListNode*/     PublicListNode partition (ListNode head,intx) {//Write your code here        if(Head = =NULL)return NULL; ListNode Leftdummy=NewListNode (0); ListNode Rightdummy=NewListNode (0); ListNode Left= Leftdummy, right =Rightdummy;  while(Head! =NULL) {            if(Head.val <x) {Left.next=Head; Left=Head; } Else{Right.next=Head; Right=Head; } head=Head.next; } Right.next=NULL; Left.next=Rightdummy.next; returnLeftdummy.next; }    }

View Code

Total time: 1573 Ms

Python program:

"""Definition of Listnodeclass ListNode (object): Def __init__ (Self, Val, next=none): Self.val = Val Self . Next = Next"""classSolution:"""@param head:the first node of linked list. @param x:an integer @return: a ListNode"""    defpartition (self, head, x):#Write your code here        ifHead = =None:returnHead Lefthead=listnode (0) Righthead=listnode (0) left=Lefthead Right=Righthead whilehead!=None:ifhead.val<X:left.next=Head Left=Left.nextElse: Right.next=Head Right=Right.next Head=Head.next Right.next=None Left.next=Righthead.nextreturnLefthead.next

View Code

Total time: 517 MS

It's a little bit different from Java, but it has no effect.

Lintcode Easy title: Partition List Link List Division