C language bubbling + singly linked list

Bubble Sort:

#include<iostream>
#include<cstdio>
#include<cstdlib>
using namespace std;

const int size=5;

int a[size]={
    
    5,1,3,2,4};

void buble_sort(){
    
    
	for(int i=1;i<size;i++){
    
    
		int flag=1;
		for(int j=0;j<=size-i-1;j++){
    
    
			if(a[j]>a[j+1]){
    
    
				swap(a[j],a[j+1]);
				flag=0;
			}
		}
		if(flag) break;
	}
}


int main(){
    
    
	buble_sort();
	for(int i=0;i<size;i++){
    
    
		cout<<a[i]<<" ";
	}
	cout<<endl;
	
	
	return 0;
} 

---

Single list:

#include<iostream>
#include<cstdio>
#include<cstdlib>
using namespace std;

typedef struct LinkList{
    
    
	int data;
	struct LinkList *next;
}L;

L *h=(L*)malloc(sizeof(L));

void init(){
    
    
	h->next=NULL;
}

void insert(){
    
    
	int key=-1;
	cout<<"输入元素空格隔开,-1表示结束"<<endl;
	L *p=(L*)malloc(sizeof(L));
	p=h;
	cin>>key;
	do{
    
    
		
		L *n=(L*)malloc(sizeof(L));
		n->data=key;
		p->next=n;
		p=p->next;
		p->next=NULL;
		cin>>key;
	}while(key!=-1);
}

void del_be_index(int index){
    
    
	L *n=(L*)malloc(sizeof(L));
	L *be=(L*)malloc(sizeof(L));
	n=h->next;
	be=h;
	int now=1;
	while(n!=NULL){
    
    
		if(now==index) {
    
    
			//删除操作
			be->next=n->next;
			free(n);
			return;	
		}else{
    
    
			now++;
			n=n->next;
			be=be->next;
		}
	}
	cout<<"未找到"<<endl;
	return;
}

void del_by_key(int key){
    
    
	L *n=(L*)malloc(sizeof(L));
	L *be=(L*)malloc(sizeof(L));
	n=h->next;
	be=h;
	while(n!=NULL){
    
    
		if(n->data==key){
    
    
			be->next=n->next;
			free(n);
			return;	
		}else{
    
    
			n=n->next;
			be=be->next;
		}
	}
	cout<<"未找到"<<endl;
	return;
}

void p(){
    
    
	L *n=h;
	while(n->next!=NULL){
    
    
		cout<<n->next->data<<endl;
		n=n->next;
	}
}

int main(){
    
    
	init();
	insert();
	p();
	del_by_key(6);
	p();
	del_be_index(1);
	p();
	return 0;
}