#include <stdio.h>
#include <malloc.h>
#include <stdlib.h>
#define null 0
typedef struct node
{ char data;
  struct node *son;
  struct node *brother;
}* bitree;

int i,j;
int chose(bitree t)
{if(t->brother!=null)return 0;
   else return 1;
}

int setup(bitree &t)
{char ch=' ';
 scanf("%c",&ch);
 if(ch==' ')t=null;
 else{
	 if(!(t=(node *)malloc(sizeof(node))))return 0;
	 t->data=ch;          //建立根節點
	 setup(t->son);//建立兒子節點
	 setup(t->brother);//建立兄弟節點
 }
 return 1;
}



int travl(bitree t)
{if(t)
{ if(t->son!=null){i=i+1;travl(t->son);}//訪問兒子
  if(t->brother!=null){travl(t->brother);}//訪問兄弟
  if(i>j)j=i;
  i=i-1;
  return 1;
 }
else return 0;
}


void main()
{bitree t=null;
 i=0;j=0;
 int deep;
 printf("輸入數值:");
 setup(t);
if(!chose(t)){
	 printf("輸入錯誤!");
}
else{travl(t);
 deep=j+1;
 printf("深度為:%d",deep);
 printf("\n");
}
}