用c语言实现输入n个字符建立单链表，删除表中重复元素并修改计数，实现单链表的统计

非常感谢您的问题！以下是用 C 语言实现输入 n 个字符建立单链表，删除表中重复元素并修改计数，实现单链表的统计的代码：

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

struct node {
    char data;
    int count;
    struct node *next;
};

struct node *create_list(char *str, int n) {
    struct node *head, *p, *q;
    head = (struct node *)malloc(sizeof(struct node));
    head->next = NULL;
    q = head;
    for (int i = 0; i < n; i++) {
        p = (struct node *)malloc(sizeof(struct node));
        p->data = str[i];
        p->count = 1;
        p->next = NULL;
        q->next = p;
        q = p;
    }
    return head;
}

void delete_duplicate(struct node *head) {
    struct node *p, *q, *r;
    p = head->next;
    while (p != NULL) {
        q = p->next;
        r = p;
        while (q != NULL) {
            if (q->data == p->data) {
                r->next = q->next;
                p->count++;
                free(q);
                q = r->next;
            } else {
                r = q;
                q = q->next;
            }
        }
        p = p->next;
    }
}

void print_list(struct node *head) {
    struct node *p;
    p = head->next;
    while (p != NULL) {
        printf("%c:%d ", p->data, p->count);
        p = p->next;
    }
    printf("\n");
}

int main() {
    char str[100];
    int n;
    printf("请输入字符串长度n：");
    scanf("%d", &n);
    printf("请输入字符串：");
    scanf("%s", str);
    struct node *head = create_list(str, n);
    delete_duplicate(head);
    print_list(head);
    return 0;
}

希望这个代码能够帮到您！