Untitled

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

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

struct List {
	struct Node *head, *tail;
};

List l;

void init(){
	l.head = l.tail = NULL;
}

void printList(int stt){
	struct Node *ptr = l.head;
	int len = 0;

	if(ptr == NULL)
		printf("empty ");
	else{
		while(ptr != NULL){

			if(len > stt)
			{
				break;
			}
			else{
				len++;
				printf("%d ", ptr->data);
				ptr = ptr->next;
			}
		}
	}
}

void insertFirst(int key){
	struct Node *link = (struct Node*) malloc(sizeof(struct Node));
	link->data = key;
	link->next = l.head;
	l.head = link;
}

//void insertLast(int key){
//	struct Node *link = (struct Node*) malloc(sizeof(struct Node));
//	link->data = key;
//	link->next = l.tail;
//	l.tail = link;
//}

void insert_stt(int key, int stt){
	struct Node *ptr = l.head;
	struct Node *previous = (struct Node*) malloc(sizeof(struct Node));
	int len = 0;
	int check = 0;

	while(ptr != NULL){

		if(len == stt){
			check = 1;
			break;
		}
		else{
			previous = ptr;
			len++;
			ptr = ptr->next;
		}
	}
	if(check == 1){
		struct Node *link = (struct Node*) malloc(sizeof(struct Node));
		link->data = key;
		previous->next = link;
		link->next = ptr;
	}
	else
	{
		struct Node *pt = l.head;
		if(pt == NULL)
			insertFirst(key);
		else{
			struct Node *pre = (struct Node*) malloc(sizeof(struct Node));
			while(pt != NULL){
				pre = pt;
				pt = pt->next;
			}
			struct Node *link = (struct Node*) malloc(sizeof(struct Node));
			link->data = key;
			pre->next = link;
			link->next = pt;
		}
	}
}

void deleteFirst(){
	struct Node *tempLink = l.head;
	l.head = l.head->next;
	tempLink = NULL;
}

int isEmpty(){
	return l.head == NULL;
}

void deleteStt(int stt){
	struct Node* current = l.head;
	struct Node* previous = NULL;
	int len = 0;
	int check = 0;

	while(current != NULL){

		if(len == stt){
			check = 1;
			break;
		}
		else
		{
			previous = current;
			current = current->next;
			len++;
		}
	}
	if(check == 1){
		if(current == l.head)
			l.head = l.head->next;
		else
			previous->next = current->next;
	}
}


//input
char cmline;
int j, k, number;

int main(){
	freopen("input.txt", "r", stdin);

	int testcase;
	scanf("%d", &testcase);

	for(int t=1; t<=testcase; t++){
		init();

		printf("#%d ", t);

		//solve
		scanf("%d", &number);
		for(int i=0; i<number; i++){
			scanf(" %c", &cmline);
			switch (cmline)
			{
			case 'f':
				scanf("%d", &k);
				insertFirst(k);
				break;
			case 'i':
				scanf("%d %d", &j, &k);
				insert_stt(k, j);
				break;
			case 'r':
				if(!isEmpty()){
					deleteFirst();
				}
				break;
			case 'd':
				scanf("%d", &j);
				deleteStt(j);
				break;
			case 'p':
				scanf("%d", &j);
				printList(j);
				break;
			default:
				break;
			}
		}
		printf("\n");
	}

	return 0;
}