//http://acm.pku.edu.cn/JudgeOnline/problem?id=2255
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <iostream>
using namespace std;
char preorder[30];
char inorder[30];
typedef struct _node
{
char
val;
struct _node
*left;
struct _node
*right;
}node;
struct _node* root;
struct _node* mk_tree(char *pre,char *in,int n)//递归建树,注意返回的是节点指针
{
struct
_node* r=NULL;
if(n>0)
{
r=(struct
_node*)malloc(sizeof(struct _node));
r->val=*pre;
int i;
char
*p=in;
for(i=0;i<n;i++,p++)
if(*p==*pre)break;
#include <string.h>
#include <stdlib.h>
#include <iostream>
using namespace std;
char preorder[30];
char inorder[30];
typedef struct _node
{
char
val;
struct _node
*left;
struct _node
*right;
}node;
struct _node* root;
struct _node* mk_tree(char *pre,char *in,int n)//递归建树,注意返回的是节点指针
{
struct
_node* r=NULL;
if(n>0)
{
r=(struct
_node*)malloc(sizeof(struct _node));
r->val=*pre;
int i;
char
*p=in;
for(i=0;i<n;i++,p++)
if(*p==*pre)break;
r->left=mk_tree(pre+1,in,i);
r->right=mk_tree(pre+i+1,in+i+1,n-i-1);
}
return
r;
}
void postorder(struct _node* r)//后根遍历
{
if(r==NULL)return;
postorder(r->left);
postorder(r->right);
printf("%c",r->val);
}
int main()
{
while(cin>>preorder>>inorder)
{
struct
_node* root=mk_tree(preorder,inorder,strlen(preorder));
postorder(root);
printf("/n");
}
return
0;
}