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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. struct Node
  5. {
  6.     int value;
  7.     struct Node *left;
  8.     struct Node *right;
  9. };
  10.  
  11. struct Node *new_node(int v)
  12. {
  13.     struct Node *n = malloc(sizeof(*n));
  14.     n->value = v;
  15.     n->left = NULL;
  16.     n->right = NULL;
  17.     return n;
  18. }
  19.  
  20. struct Node *add_node(struct Node *n, int v)
  21. {
  22.     if (n == NULL)
  23.     {
  24.         return new_node(v);
  25.     }
  26.     else
  27.     {
  28.         if (v < n->value)
  29.         {
  30.             n->left = add_node(n->left, v);
  31.         }
  32.         else
  33.         {
  34.             n->right = add_node(n->right, v);
  35.         }
  36.  
  37.         return n; 
  38.     }
  39. }
  40.  
  41. int exists_node(struct Node *n, int v)
  42. {
  43.     if (n == NULL)
  44.     {
  45.         return 0;
  46.     }
  47.     else
  48.     {
  49.         if (v < n->value)
  50.         {
  51.             return exists_node(n->left, v);
  52.         }
  53.         else if (n->value < v)
  54.         {
  55.             return exists_node(n->right, v);
  56.         }
  57.         else
  58.         {
  59.             return 1;
  60.         }
  61.     }
  62. }
  63.  
  64. int min_node(struct Node *n)
  65. {
  66.     if (n->left == NULL)
  67.     {
  68.         return n->value;
  69.     }
  70.     else
  71.     {
  72.         return min_node(n->left);
  73.     }
  74. }
  75.  
  76. int main() {
  77.     int i;
  78.     int v;
  79.     int n;
  80.     FILE *f;
  81.     struct Node *t;
  82.  
  83.     t = NULL;
  84.     f = fopen("input.txt", "r");
  85.     fscanf(f, "%d", &n);
  86.     for (i = 0; i < n; i++)
  87.     {
  88.         fscanf(f, "%d", &v);
  89.         t = add_node(t, v);
  90.     }    
  91.     fclose(f);
  92.  
  93.     printf("> ");
  94.     scanf("%d", &v);
  95.  
  96.     if (exists_node(t, v))
  97.     {
  98.         printf("yes\n");
  99.     }
  100.     else
  101.     {
  102.         printf("no\n");
  103.     }
  104.  
  105.     if (t != NULL)
  106.     {
  107.         printf("%d\n", min_node(t));
  108.     }
  109.  
  110.     return 0;
  111. }
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https://ideone.com/dOwc3m
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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