PTA——是否同一棵二叉搜索树

Posted 2021-11-27 cxc1357

PTA

04-树4 是否同一棵二叉搜索树 

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 typedef struct TreeNode *Tree;
 4 struct TreeNode{
 5     int v;
 6     Tree Left,Right;
 7     int flag;
 8 };
 9 Tree NewNode(int V){
10     Tree T=(Tree)malloc(sizeof(struct TreeNode));
11     T->v = V;
12     T->Left = T->Right=NULL;
13     T->flag=0;
14     return T;
15 }
16 Tree Insert(Tree T,int V){
17     if(!T) T=NewNode(V);
18     else{
19         if(V>T->v)
20         T->Right = Insert(T->Right,V);
21         else
22         T->Left = Insert(T->Left,V);
23     }
24     return T;
25 } 
26 //读数据建树T
27 Tree MakeTree(int N){
28     Tree T;
29     int i,V;
30     scanf("%d",&V);
31     T = NewNode(V);
32     for(i=1;i<N;i++){
33         scanf("%d",&V);
34         T=Insert(T,V); 
35     }
36     return T;
37 }
38 //查找结点 
39 int check(Tree T,int V){
40     if(T->flag){
41         if(V<T->v) return check(T->Left,V);
42         else if(V>T->v) return check(T->Right,V);
43         else return 0;
44     }else{
45         if(V==T->v){
46             T->flag = 1;
47             return 1;
48         }else return 0;
49     }
50 }
51 int Judge(Tree T,int N){
52     int i,V,flag = 0;  //flag:0代表目前还不一致，1代表已经不一致 
53     scanf("%d",&V);
54     if(V!=T->v) flag = 1;
55     else T->flag = 1;
56     for(i=1;i<N;i++){
57         scanf("%d",&V);
58         if((!flag)&&(!check(T,V))) flag = 1;
59     }
60     if(flag) return 0;
61     else return 1;
62 }
63 //清除T中各节点flag标记 
64 void ResetT(Tree T){
65     if(T->Left) ResetT(T->Left);
66     if(T->Right) ResetT(T->Right);
67     T->flag = 0;
68 }
69 //释放T的空间
70 void FreeTree(Tree T){
71     if(T->Left) FreeTree(T->Left);
72     if(T->Right) FreeTree(T->Right);
73     free(T);
74 } 
75 //判别是否与T构成一样的树 
76 int main(){
77     int N,L,i;
78     Tree T;
79     scanf("%d",&N);
80     while(N){
81         scanf("%d",&L);
82         T=MakeTree(N);
83         for(i=0;i<L;i++){
84             if(Judge(T,N)) printf("Yes\n");
85             else printf("No\n");
86             ResetT(T);  //flag清零 
87         }
88         FreeTree(T);  //数据清零 
89         scanf("%d",&N);
90     }
91     return 0; 
92 }

分析：

1、用链表存储树