RotateList.java ( File view )

  • By issaczr 2014-10-24
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			// Author:   Li Long, 1988lilong@163.com
// Date:     Apr 17, 2014
// Source:   http://oj.leetcode.com/problems/rotate-list/
// Analysis: http://blog.csdn.net/lilong_dream/article/details/19848277

// Given a list, rotate the list to the right by k places, where k is non-negative.
// For example:
// Given 1->2->3->4->5->NULL and k = 2,
// return 4->5->1->2->3->NULL.

/**
 * Definition for singly-linked list.
 * public class ListNode {

 *     int val;
 *     ListNode next;
 *     ListNode(int x) {

 *         val = x;
 *         next = null;
 *     
}
 * 
}
 */

public class RotateList {

	public ListNode rotateRight(ListNode head, int n) {

		if (head == null || n == 0) {

			return head;
		
}

		int length = 1;
		ListNode node = head;
		while (node.next != null) {

			++length;
			node = node.next;
		
}

		node.next = head;

		int m = n % length;

		for (int i = 0; i < length - m; ++i) {

			node = node.next;
		
}

		head = node.next;

		node.next = null;

		return head;
	
}

	public void printList(ListNode node) {

		while (node != null) {

			System.out.print(node.val + "->");
			node = node.next;
		
}
		System.out.println(" ");
	
}

	public static void main(String[] args) {

		ListNode head = new ListNode(1);
		ListNode n2 = new ListNode(2);
		ListNode n3 = new ListNode(3);
		ListNode n4 = new ListNode(4);
		head.next = n2;
		n2.next = n3;
		n3.next = n4;

		RotateList slt = new RotateList();
		slt.printList(head);
		ListNode res = slt.rotateRight(head, 1);
		slt.printList(res);
	
}

}			
...
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