hihocoder1049 

 1 #include <cstdio>
 2 #include <cstring>
 3 #include <cstdlib>
 4 struct Node{
 5     Node *lchild;
 6     Node *rchild;
 7     char c;
 8 };
 9 Node *creat(){
10     Node *T =(Node*)malloc(sizeof(Node));
11     T->lchild=T->rchild=NULL;
12     return T;
13 }
14 char str1[30],str2[30];
15 void post_order(Node *T){
16     if(T->lchild!=NULL){
17         post_order(T->lchild);
18     }
19     if(T->rchild!=NULL){
20         post_order(T->rchild);
21     }
22     printf("%c",T->c);
23 }
24 Node *build(int s1,int e1,int s2,int e2){
25     Node* ret=creat(); //为该树申请空间
26     ret->c=str1[s1];
27     int rootIdx;
28     for(int i=s2;i<=e2;i++){ //查找该根节点在中序遍历中的顺序 
29         if(str2[i]==str1[s1]){
30             rootIdx=i;
31             break;
32         }
33     }
34     if(rootIdx!=s2){ //若左子树不为空 
35         ret->lchild=build(s1+1,s1+(rootIdx-s2),s2,rootIdx-1);
36     }                    //递归还原其左子树 
37     if(rootIdx!=e2){ //若右子树不为空 
38         ret->rchild=build(s1+(rootIdx-s2)+1,e1,rootIdx+1,e2);
39     }                    //递归还原其右子树 
40     return ret;//返回根节点指针
41      
42      
43     
44 }
45 
46 int main(){
47     scanf("%s",str1);
48     scanf("%s",str2);
49     int l1,l2;
50     l1=strlen(str1);
51     l2=strlen(str2);
52     Node *T=build(0,l1-1,0,l2-1);
53     post_order(T);
54     printf("\n");
55     
56 
57     return 0;
58     
59 }
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posted @ 2017-03-26 11:32  vector11248  阅读(153)  评论(0)    收藏  举报