链表插入排序
题目
用插入排序对链表排序
样例
Given 1->3->2->0->null, return 0->1->2->3->null
题解
/**
* Definition for ListNode.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int val) {
* this.val = val;
* this.next = null;
* }
* }
*/
public class Solution {
/**
* @param head: The first node of linked list.
* @return: The head of linked list.
*/
public ListNode insertionSortList(ListNode head) {
ListNode dummy = new ListNode(0);
while (head != null)
{
ListNode node = dummy;
while (node.next != null && node.next.val < head.val)
{
node = node.next;
}
ListNode temp = head.next;
head.next = node.next;
node.next = head;
head = temp;
}
return dummy.next;
}
}
Last Update 2016.9.8