revese the linked list java

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Alejandro
09 May 2018
1/*
2public class ListNode {
3    public int val;
4    public ListNode next;
5    public ListNode(int x) { val = x; next = null; }
6}
7*/
8
9public static ListNode[] reverse_linked_list(ListNode head) {
10
11        ListNode prev = null;
12        ListNode current = head;
13        ListNode next;
14
15        ListNode tail = head;
16
17        while (current != null) {
18
19            next = current.next;
20            current.next = prev;
21            prev = current;
22            current = next;
23        }
24
25        head = prev;
26
27        ListNode[] result = {head, tail};
28
29        return result;
30}
Marco
08 Feb 2017
1Easiest way
2
3
4public static LinkedList reverse(LinkedList head) {
5		LinkedList prevAddress = null;
6		LinkedList currentAddress = head;
7		LinkedList nextAddress = head.next;
8		
9		while(nextAddress!=null) {
10			currentAddress.next = prevAddress;
11			prevAddress = currentAddress;
12			currentAddress = nextAddress;
13			nextAddress= currentAddress.next;
14			currentAddress.next = prevAddress;
15		}
16		head = currentAddress;
17		return head;
18	}
19    
20Just try to visualize its all about pointers game. :-)
21  NO GFG ANSWER
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