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

struct Customer {
    int id;
    int arrival_time;
    struct Customer *next;
};

struct Customer* createNode(int id,int arrival_time) {
    struct Customer *newNode = (struct Customer*)malloc(sizeof(struct Customer));
    newNode->id = id;
    newNode->arrival_time = arrival_time;
    newNode->next = NULL;
    return newNode;
}
void enqueue(struct Customer **front, struct Customer **rear, int id, int arrival_time){
    struct Customer *newNode
}
int main(){
    
}