#include<stdlib.h>
#include<stdio.h>
#include<time.h> 
typedef struct TreeNode *SearchTree;
struct TreeNode{
	SearchTree Left;
	SearchTree Right;
	int Element;
};
//类似于中序遍历 不过是中序赋值罢了 
SearchTree GenTree( int Height, int *LastNode ) //构造 高度一定时节点数最小的二叉树 
	{
		SearchTree T;
		if( Height >= 0 ){
			T = (SearchTree)malloc(sizeof(struct TreeNode));	
			T->Left = GenTree( Height - 1, LastNode );
			T->Element = ++*LastNode;
			T->Right = GenTree( Height - 2, LastNode );  //改为 Height-1即是完美二叉树 
			return T;
		}	
		else  //为什么不能用 T = NULL  而是 必须要返回 
			return NULL;
	} 
SearchTree MinAvlTree(int H)
	{
		int LastNodeAssigned = 0;
		return GenTree( H, &LastNodeAssigned );	
	}
void PreTrv(SearchTree T)//先序遍历 
	{
		if(T){
			printf("%d ",T->Element);
			PreTrv(T->Left);
			PreTrv(T->Right);	
		}	
	}
	
void InTrv(SearchTree T)//中序遍历 
	{
		if(T){
			InTrv(T->Left);
			printf("%d ",T->Element);
			InTrv(T->Right);	
		}	
	}
int	RanInt(int L, int U)
	{
		srand((unsigned)time(NULL));
		return rand()%(U-L+1)+L;	
	} 
			
SearchTree MakeRandomTree1( int Lower, int Upper )
	{
		SearchTree T;
		int RandomValue;
		T = NULL;
		if( Lower <= Upper ){
			T = (SearchTree)malloc(sizeof(struct TreeNode));
			T->Element = RandomValue = RanInt(Lower, Upper);
			T->Left = MakeRandomTree1(Lower, RandomValue-1);
			T->Right = MakeRandomTree1(RandomValue+1, Upper);
		} 
		return T;	
	}
	
SearchTree MakeRandomTree(int N)
	{
		return MakeRandomTree1(1, N);	
	}	

	
int main()
	{
		
//		int H;
		SearchTree T1,T2;
//		scanf("%d",&H);
//		T1 = MinAvlTree(H);
		int N;
//		printf("%d",RanInt(1,10));
		scanf("%d",&N);
		T2 = MakeRandomTree(N);
		printf("\n先序遍历 :\n\t"); 
		PreTrv(T2);
//		printf("\n中序遍历 : \n\t");
//		InTrv(T2);
		return 0;	
	}