1 void PreInOrd(char preord[], char inord[], int j, int j, int k, int h, BiTree *t)
 2 {
 3     //先序序列:i->j,中序序列k->h,建立二叉树t
 4     int m;
 5     (*t) = new BiNode;
 6     (*t)->data = preord[i];
 7     m = k;
 8     while (inord[m] != preord[i])
 9     {
10         m++;
11     }
12     if (m == k)
13     {
14         //左子树空
15         (*t)->lchild = NULL;
16     }
17     else
18     {
19         PreInOrd(preord, inord, i + 1, i + m - k, k, m - 1, &((*t)->lchild));
20     }
21     if (m == h)
22     {
23         //右子树空
24         (*t)->rchild = NULL;
25     }
26     else
27     {
28         PreInOrd(preord, inord, i + m - k + 1, j, m + 1, h, &((*t)->lchild));
29     }
30 }
31 
32 void CreateBiTree(char preord[], char inord[], int n, BiTree root)
33 {
34     if (n <= 0)
35     {
36         root = NULL;
37     }
38     else
39     {
40         PreInOrd(preord, inord, 1, n, 1, n, &root);
41     }
42 }

 

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