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  1. //(c)Terminator
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. #include <malloc.h>
  5.  
  6.  
  7. typedef struct _bstree {
  8. 	int val;
  9. 	struct _bstree* left;
  10. 	struct _bstree* right;
  11. } bstree;
  12.  
  13. static int  add(bstree** tr, int n);
  14. static void clear(bstree* tr);
  15. static void print(FILE* _o, const bstree* p, int n);
  16.  
  17.  
  18. int main(void){
  19. 	int i;
  20. 	bstree* tr = NULL;
  21.  
  22. 	for(i = 0; i < 20; ++i)
  23. 		add(&tr, rand() % 40);
  24.  
  25. 	print(stdout, tr, 20);
  26. 	clear(tr);
  27. 	return 0;
  28. }
  29.  
  30.  
  31.  
  32. //добавление элемента в дерево
  33. static int add(bstree** tr, int n){
  34. 	bstree* p = *tr;
  35. 	while(p != NULL){
  36. 		if(n < p->val){
  37. 			tr = &p->left;
  38. 			p  = p->left;
  39. 		} else {
  40. 			if(n == p->val)
  41. 				return 0;
  42. 			tr = &p->right;
  43. 			p  = p->right;
  44. 		}
  45. 	}
  46.  
  47. 	p = (bstree*)malloc(sizeof(bstree));
  48. 	if(p != NULL){
  49. 		p->left = p->right = NULL;
  50. 		p->val  = n;
  51. 		*tr = p;
  52. 	}
  53. 	return (p != NULL);
  54. }
  55.  
  56.  
  57. //удаление всего дерева
  58. static void clear(bstree* tr){
  59. 	if(tr != NULL){
  60. 		if(tr->left != NULL)
  61. 			clear(tr->left);
  62. 		if(tr->right != NULL)
  63. 			clear(tr->right);
  64. 		free(tr);
  65. 	}
  66. }
  67.  
  68.  
  69. static void print(FILE* _o, const bstree* p, int n){
  70. 	int i;
  71. 	if(p != NULL){
  72. 		for(i = 0; i <= n; ++i)
  73. 			fputc(' ', _o);
  74. 		fprintf(_o, "%d\n", p->val);
  75.  
  76. 		if(p->left != NULL)
  77. 			print(_o, p->left, n - 1);
  78. 		if(p->right != NULL)
  79. 			print(_o, p->right, n + 1);
  80. 	}
  81. }
  82.  
Success #stdin #stdout 0s 3472KB
comments (?)
stdin 
Standard input is empty
stdout 
                     23
                    6
                   2
                    3
                     17
                    15
                   12
                  9
                   10
                     16
                      21
                     19
                      20
                      35
                     33
                    26
                     27
https://ideone.com/xUdHcS
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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