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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3.  
  4. typedef struct node {
  5.   int value;
  6.   struct node *left;
  7.   struct node *right;
  8. } Node;
  9.  
  10. Node *
  11. newNode(int n){
  12.   Node *obj;
  13.   obj = (Node *)malloc(sizeof(Node));
  14.   obj->value = n;
  15.   obj->left = NULL;
  16.   obj->right = NULL;
  17.   return obj;
  18. }
  19.  
  20. Node *
  21. addNode(Node *obj, int n){
  22.   if(obj == NULL){
  23.     return newNode(n);
  24.   }
  25.  
  26.   if(obj->value == n){
  27.     /*do nothing*/
  28.   }else if(obj->value < n){
  29.     obj->right = addNode(obj->right, n);
  30.   } else{
  31.     obj->left = addNode(obj->left, n);/*   (6)   */
  32.   }
  33.  
  34.   return obj;
  35. }
  36.  
  37.  
  38. Node *
  39. appendRightEnd(Node *obj, Node *right){
  40.   if(obj != NULL){
  41.     if(obj->right == NULL){
  42.       obj->right = right;
  43.     }else{
  44.       obj->right = appendRightEnd(obj->right, right);/*   (7)   */;
  45.     }
  46.   }
  47.   return obj;
  48. }
  49.  
  50.  
  51. Node *
  52. deleteNode(Node *obj, int n){
  53.   Node *newobj;
  54.  
  55.   if(obj != NULL){
  56.     if(obj->value == n){
  57.  
  58.       if (obj->left == NULL){
  59. 	newobj = obj->right;
  60. 	free(obj);
  61. 	return newobj;
  62.       }else if(obj->right == NULL){
  63. 	newobj = obj->left;/*   (8)   */
  64. 	free(obj);
  65. 	return newobj;
  66.       }else{
  67.  
  68. 	obj->left = appendRightEnd(obj->left, obj->right);
  69. 	newobj = obj->left;
  70. 	free(obj);
  71. 	return newobj;
  72.       }
  73.     }else{
  74.       if(obj->value < n)
  75. 	obj->right = deleteNode(obj->right, n);
  76.       else
  77. 	obj->left = deleteNode(obj->left, n);/*   (9)   */
  78.     }
  79.   }
  80.   return obj;
  81. }
  82.  
  83.  
  84. void
  85. printNodes(Node *obj){
  86.   if(obj != NULL){
  87.     if(obj->left != NULL){
  88.       printNodes(obj->left);
  89.     }
  90.  
  91.     printf("%d\t", obj->value);
  92.  
  93.     if(obj->right != NULL){
  94.       printNodes(obj->right);
  95.     }
  96.   }
  97.  
  98. }
  99.  
  100. int
  101. main(int argc, char *argv[]){
  102.   Node *topnode = NULL;
  103.  
  104.   topnode = addNode(topnode, 5);
  105.   topnode = addNode(topnode, 7);
  106.   topnode = addNode(topnode, 1);
  107.   topnode = addNode(topnode, -1);
  108.   topnode = addNode(topnode, 4);
  109.   topnode = addNode(topnode, 10);
  110.  
  111.   printNodes(topnode);
  112.   printf("\n");
  113.   topnode = deleteNode(topnode, 5);
  114.  
  115.   printNodes(topnode);
  116.   printf("\n");
  117. }
Runtime error #stdin #stdout 0.01s 1852KB
comments (?)
stdin 
Standard input is empty
stdout 
-1	1	4	5	7	10	
-1	1	4	7	10
https://ideone.com/1eCN6
language:
C (gcc 8.3)
created:
12 years ago
visibility:
secret

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