为什么在自己电脑能运行 pta上不行

问题遇到的现象和发生背景

问题相关代码，请勿粘贴截图

#define  _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>
typedef struct node* list;
struct node
{
    int data;
    list next;
};
list initN() {
    int K = 0;
    scanf("%d", &K);
    list N1 = (list)malloc(sizeof(node));
    N1->data = 0;
    N1->next = NULL;
    for (; K > 0; K--) {
        list N = (list)malloc(sizeof(node));
        int data = 0;
        scanf("%d", &data);
        N->data = data;
        N->next = N1->next;
        N1->next = N;
    }
    return N1;
}
int combine(list N) {
    int record = 0;
    int finding=0;
    while (N->next != NULL) {
        finding += N->next->data;
        N = N->next;
        if (finding <= 0) {
            finding = 0;
        }
        if (finding > record) {
            record = finding;
        }
    }
    return record;
}
int main() {
    list N1 = initN();
    printf("%d", combine(N1));
}

运行结果及报错内容

我的解答思路和尝试过的方法

我想要达到的结果

第13行， list N1 = (list)malloc(sizeof(node)); 应修改为：list N1 = (list)malloc(sizeof(struct node));
第17行，list N = (list)malloc(sizeof(node)); 应修改为：list N = (list)malloc(sizeof(struct node));
后面两个是警告，提示 scanf()函数的返回值没有使用。修改见注释处，供参考：

#define  _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>
typedef struct node* list;
struct node
{
    int data;
    list next;
};
list initN() {
    int K = 0, r;
    do{               //修改
        r = scanf("%d", &K);
        getchar();
    }while(r != 1);   //修改
    list N1 = (list)malloc(sizeof(struct node));//修改
    N1->data = 0;
    N1->next = NULL;
    for (; K > 0; K--) {
        list N = (list)malloc(sizeof(struct node));//修改
        int data = 0;
        do{            //修改
            r = scanf("%d", &data);
            getchar();
        }while(r != 1);//修改
        N->data = data;
        N->next = N1->next;
        N1->next = N;
    }
    return N1;
}
int combine(list N) {
    int record = 0;
    int finding=0;
    while (N->next != NULL) {
        finding += N->next->data;
        N = N->next;
        if (finding <= 0) {
            finding = 0;
        }
        if (finding > record) {
            record = finding;
        }
    }
    return record;
}
int main() {
    list N1 = initN();
    printf("%d", combine(N1));

    return 0;
}