SDUTOJ 2128 树结构练习——排序二叉树的中序遍历

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#include<iostream>
using namespace std;
int f;
typedef struct BiTNode
{
	int data;
	struct BiTNode *lchild,*rchild;
}BiTNode,*BiTree;
void visit(BiTree T)
{
	if(T->data!=NULL)
	{
		if(f==1)
		{
			cout<<" "<<T->data;
		}
		else
		{
			cout<<T->data;
			f=1;
		}
	}
}
void insert(BiTree &T,int key)
{
	if(T==NULL)
	{
		T=new BiTNode;
		T->lchild=T->rchild=NULL;
		T->data=key;
		return ;
	}
	if(key<T->data)
		insert(T->lchild,key);
	else
		insert(T->rchild,key);
}
void InOrder(BiTree T)
{
	if(T)
	{
		InOrder(T->lchild);
		visit(T);
		InOrder(T->rchild);
	}
}
int main()
{
	int m,i,n;
	BiTree T;
	while(cin>>m)
	{
		T=NULL;
		for(i=0;i<m;i++)
		{
			cin>>n;
		    insert(T,n);
		}
		f=0;
		InOrder(T);
		cout<<"\n";
	}
	return 0;
}