#include <stdio.h>
#include <stdlib.h>typedef struct Node {int data;struct Node* next;
} Node, *LinkedList;// 创建一个新节点
Node* createNode(int data) {Node* newNode = (Node*)malloc(sizeof(Node));if (newNode == NULL) {printf("Error! Unable to create a new node.\n");exit(0);}newNode->data = data;newNode->next = NULL;return newNode;
}// 在链表末尾添加新节点
void append(LinkedList* head, int data) {if (*head == NULL) {*head = createNode(data);}else {Node* lastNode = *head;while (lastNode->next != NULL) {lastNode = lastNode->next;}lastNode->next = createNode(data);}
}// 打印链表
void printList(LinkedList head) {while (head != NULL) {printf("%d ", head->data);head = head->next;}printf("\n");
}LinkedList findNodeK(Node* head1, int k)
{if (head1 == NULL){return NULL;}int length = 0;Node* tail = head1;while (tail != NULL){tail = tail->next;length++;}if (length <= k){return head1;}Node* cur = head1;int i = length - k;while(i != 0){cur = cur->next;i--;}return cur;
}int main() {LinkedList head1 = NULL;append(&head1, 1);append(&head1, 2);append(&head1, 3);append(&head1, 4);append(&head1, 5);append(&head1, 6);printf("Original List1: ");printList(head1);LinkedList head = findNodeK(head1, 4);printf("findNodeK List: ");printList(head);system("pause");return 0;
}

参考：https://blog.csdn.net/weixin_53161762/article/details/137611306?spm=1001.2014.3001.5501