sdutacm-求二叉树的深度

求二叉树的深度

TimeLimit: 1000MS Memory Limit: 65536KB

SubmitStatistic

PRoblem Description

已知一颗二叉树的中序遍历序列和后序遍历序列，求二叉树的深度。

Input

输入数据有多组，输入T，代表有T组数据。每组数据包括两个长度小于50的字符串，第一个字符串表示二叉树的中序遍历，第二个表示二叉树的后序遍历。

Output

输出二叉树的深度。

Example Input

2

dbgeafc

dgebfca

lnixu

linux

Example Output

4

3

Hint

Author

#include<string.h>#include<stdio.h>#include<stdlib.h>#include<algorithm>#include<queue>#include<iostream>using namespace std;typedef struct node{   char data;   struct node*l;   struct node*r;}tree;void huifu(char *zhong,char *hou,int len)//仅仅求出后序遍历树{  if(len==0)  return ;  tree *p = new tree;  p->data = *(hou+len-1);  int i = 0;  for(;i<len;i++)  if(zhong[i]==*(hou+len-1))  {     break;  }   cout<<p->data;  huifu(zhong,hou,i);  huifu(zhong+i+1,hou+i,len-i-1);  return ;}tree* huifu3(char *zhong,char *hou,int len)//已知中序后序遍历，求出并建立以该树组成的（以后序建立的）树；{   tree*root = new tree;   if(len==0)   return NULL;   root->data = *(hou+len-1);   int i;   for( i = 0; i < len ;i++)   {     if(zhong[i] == *(hou+len-1))     break;   }   root->l = huifu3(zhong,hou,i);   root->r = huifu3(zhong+i+1,hou+i,len-i-1);  return root;}tree* huifu2(char *xian,char *zhong,int len)//同上已知先序中序建立前序树；{   tree*head =new tree;   if(len==0)   return NULL;   head->data = *(xian);   int i = 0;   for(;i<len;i++)   {       if(zhong[i]==*xian)       break;   }   head->l = huifu2(xian+1,zhong,i);   head->r = huifu2(xian+i+1,zhong+i+1,len-i-1);   return head;}void last(tree*root)/*后序遍历树*/{   if(root)   {      last(root->l);      last(root->r);      cout<<root->data;   }}int high(tree*root)//递归求出树的高度{   if(!root)   return 0;   else   return max(high(root->l),high(root->r))+1;}void ccout(tree*root)//层次遍历（从上到下，从左到右）先序树，并打印{    queue<tree*>q;    tree*p =NULL;    if(root)    {      q.push(root);    }    while(!q.empty())    {        p = q.front();        q.pop();        cout<<p->data;        if(p->l)        {           q.push(p->l);        }        if(p->r)        {           q.push(p->r);        }    }}int main(){   char hou[102],zhong[102],xian[102];   int o;   cin>>o;   while(o--)   {    int len;   scanf("%s%s",zhong,hou);   len = strlen(zhong);   tree* root;   root = huifu3(zhong,hou,len);   int u = high(root);   cout<<u<<endl;   }}/***************************************************User name: jk160505徐红博Result: AcceptedTake time: 0msTake Memory: 160KBSubmit time: 2017-02-07 16:12:17****************************************************/