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147.java
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147.java
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/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode() {}
* ListNode(int val) { this.val = val; }
* ListNode(int val, ListNode next) { this.val = val; this.next = next; }
* }
*/
class Solution {
public ListNode insertionSortList(ListNode head) {
if( head == null || head.next == null){
return head;
}
ListNode helperHead = new ListNode(Integer.MAX_VALUE);
ListNode next = null;
ListNode current = head;
ListNode previous = helperHead;
while( current != null ){
next = current.next;
while((previous.next != null) && (previous.next.val < current.val)){
previous = previous.next;
}
current.next = previous.next;
previous.next = current;
current = next;
previous = helperHead;
}
return helperHead.next;
}
}