链表操作

#include <stdio.h>
#include <stdlib.h>

typedef struct Node{
    int data;
    struct Node *next;
}Node, *LinkedList;

LinkedList insert(LinkedList head, Node *node, int index) {
    if (head == NULL) {//头指针为空
        if (index != 0) {
            return head;
        }
        head = node;
        return head;
    }
    if (index == 0) {//插入结点位置链表首位
        node->next = head;
        head = node;
        return head;
    }
    Node *current_node = head;
    int count = 0;
    while (current_node->next != NULL && count < index - 1) {
        current_node = current_node->next;
        count++;
    }
    if (count == index - 1) {
        node->next = current_node->next;
        current_node->next = node;
    }
    return head;
}

// 请在下面实现输出函数 output
void output(LinkedList head){
    if(head == NULL){
        return ;
    }
    Node *current_node = head;
    while(current_node != NULL){
        printf("%d ",current_node->data);
        current_node = current_node->next;
    }
    printf("\n");
}

void clear(LinkedList head) {
    Node *current_node = head;
    while (current_node != NULL) {
        Node *delete_node = current_node;
        current_node = current_node->next;
        free(delete_node);
    }
}

int main() {
    LinkedList linkedlist = NULL;
    for (int i = 1; i <= 10; i++) {
        Node *node = (Node *)malloc(sizeof(Node));
        node->data = i;
        node->next = NULL;
        linkedlist = insert(linkedlist, node, i - 1);
    }
    output(linkedlist);
    
    clear(linkedlist);
    return 0;
}

#include <stdio.h>
#include <stdlib.h>

typedef struct Node{
    int data;
    struct Node *next;
}Node, *LinkedList;

LinkedList insert(LinkedList head, Node *node, int index) {
    if(head == NULL){
        if(index != 0){
            printf("failed\n");
            return head;
        }
        head = node;
        printf("success\n");
        return head;
        
    }
    if(index == 0){
        node->next = head;
        head = node;
        printf("success\n");
        return head;
    }
    Node *current_node = head;
    int count = 0;
    while(current_node->next != NULL && count < index - 1){
        current_node = current_node->next;
        count++;
    }
    if(count == index -1 ){
        node->next = current_node->next;
        current_node->next = node;
        printf("success\n");
        return head;
    }
    printf("failed\n"); 
    return head;
}

void output(LinkedList head) {
    if(head == NULL){
        return;
    }
    Node * current_node = head;
    while(current_node != NULL){
        printf("%d",current_node->data);
        if(current_node->next != NULL){
            printf(" ");
        }
        current_node = current_node->next;
    }
    //printf("\n");
}

void clear(LinkedList head) {
    Node *current_node = head;
    while(current_node != NULL){
        Node *delete_node = current_node;
        current_node = current_node->next;
        free(delete_node);
    }

}

int main() {
    LinkedList linkedlist = NULL;
    int n;
    scanf("%d",&n);
    int p,q;
    for(int i = 0; i < n; i++){
        Node *node =(Node *)malloc(sizeof(node));
        scanf("%d %d", &p, &q);
        node->data = q;
        node->next = NULL;
        linkedlist = insert(linkedlist, node, p);
    }
    output(linkedlist);
    clear(linkedlist);
    return 0;
}

#include <stdio.h>
#include <stdlib.h>

typedef struct Node{
    int data;
    struct Node *next;
}Node, *LinkedList;

LinkedList insert(LinkedList head, Node *node, int index) {
    if (head == NULL) {
        if (index != 0) {
            return head;
        }
        head = node;
        return head;
    }
    if (index == 0) {
        node->next = head;
        head = node;
        return head;
    }
    Node *current_node = head;
    int count = 0;
    while (current_node->next != NULL && count < index - 1) {
        current_node = current_node->next;
        count++;
    }
    if (count == index - 1) {
        node->next = current_node->next;
        current_node->next = node;
    }
    return head;
}

void output(LinkedList head) {
    if (head == NULL) {
        return;
    }
    Node *current_node = head;
    while (current_node != NULL) {
        printf("%d ", current_node->data);
        current_node = current_node->next;
    }
    printf("\n");
}

LinkedList delete_node(LinkedList head, int index) {
    if (head == NULL) {
        return head;
    }
    Node *current_node = head;
    int count = 0;
    if (index == 0) {
        head = head->next;
        free(current_node);
        return head;
    }
    while (current_node->next != NULL && count < index - 1) {
        current_node = current_node->next;
        count++;
    }
    if (count == index - 1 && current_node->next != NULL) {
        Node *delete_node = current_node->next;
        current_node->next = delete_node->next;
        free(delete_node);
    }
    return head;
}

// 请在下面实现链表的反转函数 reverse
LinkedList reverse(LinkedList head){
    if(head == NULL){
        return head;
    }
    Node *next_node, *current_node;
    current_node = head->next;
    head->next = NULL;
    while(current_node != NULL){
        next_node = current_node->next;
        current_node->next = head;
        head = current_node;
        current_node = next_node;
    }
    return head;
}

void clear(LinkedList head) {
    Node *current_node = head;
    while (current_node != NULL) {
        Node *delete_node = current_node;
        current_node = current_node->next;
        free(delete_node);
    }
}

int main() {
    LinkedList linkedlist = NULL;
    for (int i = 1; i <= 10; i++) {
        Node *node = (Node *)malloc(sizeof(Node));
        node->data = i;
        node->next = NULL;
        linkedlist = insert(linkedlist, node, i - 1);
    }
    output(linkedlist);
    linkedlist = delete_node(linkedlist, 3);
    output(linkedlist);
    linkedlist = reverse(linkedlist);
    output(linkedlist);
    clear(linkedlist);
    return 0;
}