golang linked list flipping

golang Linked List Flip

In computer science, linked list (Linked List) is a basic data structure. A linked list is composed of a series of nodes, each node contains a data item and a reference to the next node. Linked lists are often used to implement data structures such as stacks, queues, and hash tables in programs.

In a linked list, each node has a reference to the next node. This makes linked lists ideal for insertion and deletion operations. But one disadvantage of the linked list is that when accessing any element of the linked list, you need to traverse the entire linked list from the beginning, which makes accessing the linked list very complicated. To avoid this problem, we need to reorganize the linked list so that each node points to its previous node. In this way, we can access the linked list from the end without traversing the entire linked list.

Linked list flipping is a common linked list operation. This article will introduce the method of using golang language to implement linked list flipping.

1. Define the linked list node structure

First, we need to define a linked list node structure. Each node contains two properties: Value and Next.

type ListNode struct {
    Value int
    Next  *ListNode
}

Among them, Value is used to store the value of the current node, and Next is used to point to the address of the next node.

2. Implementing the linked list flip function

Next, we need to implement the linked list flip function. The linked list flip function needs to receive the head node of a linked list as a parameter and return a flipped head node of the linked list. The code is as follows:

func reverseList(head *ListNode) *ListNode {
    // 定义空节点和当前节点
    var prev *ListNode
    curr := head

    // 遍历整个链表
    for curr != nil {
        // 保存当前节点的下一个节点
        next := curr.Next

        // 将当前节点的Next指向前一个节点
        curr.Next = prev

        // 更新prev和curr
        prev = curr
        curr = next
    }

    // 返回翻转后的链表头节点
    return prev
}

In this function, we use three pointers: prev, curr and next. prev points to the node that has been flipped, curr points to the node that currently needs to be flipped, and next points to the next node of curr.

We traverse the entire linked list, pointing curr's Next to prev each time, and update prev and curr. Finally, return the flipped head node of the linked list (ie, prev node).

3. Complete code

The following is the complete golang code:

type ListNode struct {
    Value int
    Next  *ListNode
}

func reverseList(head *ListNode) *ListNode {
    // 定义空节点和当前节点
    var prev *ListNode
    curr := head

    // 遍历整个链表
    for curr != nil {
        // 保存当前节点的下一个节点
        next := curr.Next

        // 将当前节点的Next指向前一个节点
        curr.Next = prev

        // 更新prev和curr
        prev = curr
        curr = next
    }

    // 返回翻转后的链表头节点
    return prev
}

Through the above code, we have successfully implemented the linked list flip function. In practical applications, linked list flipping is usually used to solve some problems, such as reversing strings, reversing arrays, etc. Mastering linked list operation skills is very important for writing efficient and stable programs.

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