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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3.  
  4. char in[]= {'d','b','e','a','f','c','g'};
  5. char pre[]={'a','b','d','e','c','f','g'};
  6. int size = sizeof(in);
  7. int pos = 0;
  8.  
  9. typedef struct node{
  10. 	char value;
  11. 	struct node*left;
  12. 	struct node*right;
  13. }treenode;
  14.  
  15. treenode* get_tree(int l,int r);
  16. void print(treenode*root);
  17. int search(char val);
  18.  
  19. void print(treenode*root)
  20. {
  21. 	if(root==NULL)
  22. 	return;
  23. 	print(root->left);
  24. 	printf("%c",root->value);
  25. 	print(root->right);
  26. }
  27.  
  28. int search(char val)
  29. {
  30. 	int i;
  31. 	for(i=0;i<size;i++)
  32. 	{
  33. 		if(in[i]==val)
  34. 		return i;
  35. 	}
  36. 	return -1;
  37. }
  38.  
  39. treenode* get_tree(int l, int r)
  40. {
  41. 	int inpos = search(pre[pos]);
  42. 	if(l>=r)return NULL;
  43. 	pos++;
  44. 	treenode* temp = (treenode*)malloc(sizeof(struct node));   
  45. 	temp->value = in[inpos];
  46. 	temp->left = get_tree(l,inpos);
  47. 	temp->right = get_tree(inpos+1,r);
  48. 	return temp;
  49. }
  50.  
  51. int main()
  52. {
  53.  
  54. 	treenode*root = NULL;
  55. 	int l = 0;
  56. 	root = get_tree(l,size);
  57.     print(root);
  58.     printf("\n");
  59. 	return 0;
  60. }
  61.  
Success #stdin #stdout 0s 2856KB
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dbeafcg
https://ideone.com/yXisE
language:
C++ (gcc 8.3)
created:
14 years ago
visibility:
public

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