Language: C++

#include<cstdio>
#include<cstdlib>
#include<cstring>

struct Node{
	int key;
	Npde *next,*prev;
};

Node *nil;

Node* listSearch(int key){
	Node *cur = nil->next;
	while(cur != nil && cur->key != key){
		cur = cur->next;
	}
	return cur;
}

void init(){
	nil = (Node *)malloc(sizeof(Node));
	nil->next = nil;
	nil->orev =nil;
}

void printlist(){
	Node *cur = nil->next;
	int isf = 0;
	while( 1 ){
		if(cur == nil)break;
		if(isf++ > 0)printf(" ");
		printf("%d",cur->key);
        cur = cur->next;
	}
	printf("\n");
}

void deleteNode(Node *t){
	if(t == nil)return;
	t->prev->next = t->next;
	t->next->prev = t->prev;
	free(t);
}

void deleteFirst(){
	deleteNode(nil->next);
}

void deleteLast(){
	deleteNode(nil->prev);
}

void deletekey(int key){
	
	deleteNode(listSearch(key));
}

void insert(int key){
	Node *x = (Node *)malloc(sizeof(Node));
	x->key = key;
	
	x->next = nil->next;
	nil->next->prev = x;
	nil->next = x;
	x->prev = nil;
}

int main(){
	int key,n,i;
	int size = 0;
	char com[20];
	int np = 0, nd = 0;
	scanf("%d",&n);
	init();
	for(i = 0; i < n; i++)
	scanf("%s%d",com,&key);
		if(com[0] == 'i'){ insert(key); np++; size++; }
	else if(com[0] =='d'){
		if(strlen(com) > 6){
			if(com[6] == 'F')deleteFirst();
				else if(com[6] == 'L')deleteLast();
}else{
	deletekey(key); nd++;
}
size--;
	}
}

prinList();

return 0;
}
	



Compiler output:
a.cc:7:9: error: 'Npde' does not name a type; did you mean 'Node'?
    7 |         Npde *next,*prev;
      |         ^~~~
      |         Node
a.cc: In function 'Node* listSearch(int)':
a.cc:13:26: error: 'struct Node' has no member named 'next'
   13 |         Node *cur = nil->next;
      |                          ^~~~
a.cc:15:28: error: 'struct Node' has no member named 'next'
   15 |                 cur = cur->next;
      |                            ^~~~
a.cc: In function 'void init()':
a.cc:22:14: error: 'struct Node' has no member named 'next'
   22 |         nil->next = nil;
      |              ^~~~
a.cc:23:14: error: 'struct Node' has no member named 'orev'
   23 |         nil->orev =nil;
      |              ^~~~
a.cc: In function 'void printlist()':
a.cc:27:26: error: 'struct Node' has no member named 'next'
   27 |         Node *cur = nil->next;
      |                          ^~~~
a.cc:33:20: error: 'struct Node' has no member named 'next'
   33 |         cur = cur->next;
      |                    ^~~~
a.cc: In function 'void deleteNode(Node*)':
a.cc:40:12: error: 'struct Node' has no member named 'prev'
   40 |         t->prev->next = t->next;
      |            ^~~~
a.cc:40:28: error: 'struct Node' has no member named 'next'
   40 |         t->prev->next = t->next;
      |                            ^~~~
a.cc:41:12: error: 'struct Node' has no member named 'next'
   41 |         t->next->prev = t->prev;
      |            ^~~~
a.cc:41:28: error: 'struct Node' has no member named 'prev'
   41 |         t->next->prev = t->prev;
      |                            ^~~~
a.cc: In function 'void deleteFirst()':
a.cc:46:25: error: 'struct Node' has no member named 'next'
   46 |         deleteNode(nil->next);
      |                         ^~~~
a.cc: In function 'void deleteLast()':
a.cc:50:25: error: 'struct Node' has no member named 'prev'
   50 |         deleteNode(nil->prev);
      |                         ^~~~
a.cc: In function 'void insert(int)':
a.cc:62:12: error: 'struct Node' has no member named 'next'
   62 |         x->next = nil->next;
      |            ^~~~
a.cc:62:24: error: 'struct Node' has no member named 'next'
   62 |         x->next = nil->next;
      |                        ^~~~
a.cc:63:14: error: 'struct Node' has no member named 'next'
   63 |         nil->next->prev = x;
      |              ^~~~
a.cc:64:14: error: 'struct Node' has no member named 'next'
   64 |         nil->next = x;
      |              ^~~~
a.cc:65:12: error: 'struct Node' has no member named 'prev'
   65 |         x->prev = nil;
      |            ^~~~
a.cc: At global scope:
a.cc:89:11: error: expected constructor, destructor, or type conversion before ';' token
   89 | prinList();
      |           ^
a.cc:91:1: error: expected unqualified-id before 'return'
   91 | return 0;
      | ^~~~~~
a.cc:92:1: error: expected declaration before '}' token
   92 | }
      | ^