Remove-Nodes-from-Linked-list.java

/**
 * 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 removeNodes(ListNode head) {
        ListNode prev = null;
        ListNode cur = head;
        ListNode next = null;

        while(cur != null){
            next = cur.next;
            cur.next = prev;
            prev = cur;
            cur = next;
        }

        // Result head 
        ListNode resHead = new ListNode(prev.val);
        int MAX = resHead.val; // last value include must, becz its right == null

        cur = prev.next;

        while(cur != null){
            ListNode node = new ListNode(cur.val);
            if(cur.val >= MAX){
                node.next = resHead;
                resHead = node;
                MAX = node.val;    
            }

            cur = cur.next;
        } 
        
        return resHead;
    }
}