Leetcode 86. Partition List

Posted 2023-02-15 zhangwj0101

Question

Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x.

You should preserve the original relative order of the nodes in each of the two partitions.

For example,
Given 1->4->3->2->5->2 and x = 3,
return 1->2->2->4->3->5.

Code

 public ListNode partition(ListNode head, int x) 

        ListNode min = new ListNode(0);
        ListNode max = new ListNode(1);

        ListNode minp = min;
        ListNode maxp = max;

        ListNode p = head;

        while (p != null) 
            if (p.val < x) 
                minp.next = p;
                minp = minp.next;
             else 
                maxp.next = p;
                maxp = maxp.next;
            
            p = p.next;
        
        minp.next = max.next;
        maxp.next = null;
        return min.next;