python reverse linked list

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showing results for - "python reverse linked list"
Roberto
22 Jan 2020
1def reverseLinkedList(root):
2    cur = root
3    prev = None
4    
5    while cur:
6        nxt = cur.next
7        cur.next = prev
8        prev = cur
9        cur = nxt
10
11    return prev
Adaline
07 Jan 2019
1class LinkedList { 
2  
3    static Node head; 
4  
5    static class Node { 
6  
7        int data; 
8        Node next; 
9  
10        Node(int d) 
11        { 
12            data = d; 
13            next = null; 
14        } 
15    } 
16  
17    /* Function to reverse the linked list */
18    Node reverse(Node node) 
19    { 
20        Node prev = null; 
21        Node current = node; 
22        Node next = null; 
23        while (current != null) { 
24            next = current.next; 
25            current.next = prev; 
26            prev = current; 
27            current = next; 
28        } 
29        node = prev; 
30        return node; 
31    } 
32  
33    // prints content of double linked list 
34    void printList(Node node) 
35    { 
36        while (node != null) { 
37            System.out.print(node.data + " "); 
38            node = node.next; 
39        } 
40    } 
41  
42    public static void main(String[] args) 
43    { 
44        LinkedList list = new LinkedList(); 
45        list.head = new Node(85); 
46        list.head.next = new Node(15); 
47        list.head.next.next = new Node(4); 
48        list.head.next.next.next = new Node(20); 
49  
50        System.out.println("Given Linked list"); 
51        list.printList(head); 
52        head = list.reverse(head); 
53        System.out.println(""); 
54        System.out.println("Reversed linked list "); 
55        list.printList(head); 
56    } 
57} 
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