补全如下代码：#include <stdio.h> #include <stdlib.h> struct ListNode { int data; struct ListNode *next; }; struct ListNode *readlist(); struct ListNode *deletem( struct ListNode *L, int m ); void printlist( struct ListNode *L ) { struct ListNode *p = L; while (p) { printf("%d ", p->data); p = p->next; } printf("\n"); } int main() { int m; struct ListNode *L = readlist(); scanf("%d", &m); L = deletem(L, m); printlist(L); return 0; }

代码如下：

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

struct ListNode {
    int data;
    struct ListNode *next;
};

struct ListNode *readlist();
struct ListNode *deletem(struct ListNode *L, int m);
void printlist(struct ListNode *L);

int main() {
    int m;
    struct ListNode *L = readlist();
    scanf("%d", &m);
    L = deletem(L, m);
    printlist(L);
    return 0;
}

struct ListNode *readlist() {
    struct ListNode *head = NULL, *tail = NULL;
    int n, val;
    scanf("%d", &n);
    while (n--) {
        scanf("%d", &val);
        struct ListNode *node = (struct ListNode*)malloc(sizeof(struct ListNode));
        node->data = val;
        node->next = NULL;
        if (!head) {
            head = node;
            tail = node;
        } else {
            tail->next = node;
            tail = node;
        }
    }
    return head;
}

struct ListNode *deletem(struct ListNode *L, int m) {
    struct ListNode *head = NULL, *tail = NULL;
    while (L) {
        if (L->data != m) {
            struct ListNode *node = (struct ListNode*)malloc(sizeof(struct ListNode));
            node->data = L->data;
            node->next = NULL;
            if (!head) {
                head = node;
                tail = node;
            } else {
                tail->next = node;
                tail = node;
            }
        }
        L = L->next;
    }
    return head;
}

void printlist(struct ListNode *L) {
    struct ListNode *p = L;
    while (p) {
        printf("%d ", p->data);
        p = p->next;
    }
    printf("\n");
}

该代码实现了链表的基本操作，包括创建链表、删除指定元素、打印链表等。其中，`readlist()`函数用于创建链表，`deletem()`函数用于删除指定元素，`printlist()`函数用于打印链表。主函数中，通过调用`readlist()`函数创建链表，并读入需要删除的元素，然后调用`deletem()`函数进行删除操作，最后调用`printlist()`函数打印删除后的链表。