ccup2_1_buffer_using

/*
  Suppose the list is a known one. This function is to delete the duplicate elements in the list. I use a vector here to deal
  with the deleting part.
*/
list deleteDup(list list1)
{
  vector<int> ori_list; 
  int flag=0,i=0;
	int inp1;
	list<int>::iterator copytovec;
	
	//change the list into a vector to process
	ori_list.resize(list1.size());
	for(copytovec=list1.begin();copytovec!=list1.end();copytovec++)
	{
		ori_list[i]=*copytovec;
		i++;
	}
	
	//from the bottom to the beginning, check if there is the duplicate one 
	for(int i=ori_list.size()-1;i>=0;i--)
	{
		for(int j=0;j<i;j++)
		{
			if(ori_list[i]==ori_list[j])
			{
				flag=1;
				break;
			}
		}
		if(flag==1)
		{
			ori_list.erase(ori_list.begin()+i);
			flag=0;
		}
	}
	
	list1.clear();
	for(int i=0;i<ori_list,size();i++)
	{
	  list1.push_back(ori_list);
	}
	return list1;
}