C++ Fscanf打印除退出C代码为1的程序外的所有内容

我有这个函数，它读取以下格式的一些字符串:

2
London Berlin 220 1.5
London Milan 280 2.5
...

同样的东西也应该被阅读...

2是在其自身之后的字符串的数目.为此，我有以下功能:

void allocate_info(FILE* fptr, info_t* cities_info, int N){
    int tmp_flights;
    int i = 0;
    while(fscanf(fptr, "%d", &tmp_flights) == 1){
        printf("%d\n", tmp_flights); // this print!!!
        char tmp_departure[LENGTH], tmp_arrival[LENGTH];
        int tmp_price;
        float tmp_duration;
        for(int i = 0; i < tmp_flights; i++){
            fscanf(fptr, "%s %s %d %f", tmp_departure, tmp_arrival, &tmp_price, &tmp_duration);
            strcpy(cities_info[i].departure, tmp_departure);
            strcpy(cities_info[i].arrival, tmp_arrival);
            cities_info[i].price = tmp_price;
            cities_info[i].duration = tmp_duration;
        }
    }
}

"这张照片！"实际上打印所有数字，但在结束时程序失败(错误1).这是我的主要职能:

int main(void) {
    FILE* fptr = fopen("D:/ap2/lab02ex01/file.txt", "r");
    int N;
    info_t* cities_info = (info_t*)malloc(sizeof(info_t) * N);
    N = read_number_of_cities(fptr); // some other function
    allocate_info(fptr, cities_info, N); // ERROR HERE?!?

    return 0;
}

我对它感到非常困惑，因为它打印的所有东西都正确，但程序由于某种原因失败了.请帮帮我.