diff --git a/a3/binary_search_tree.c b/a3/binary_search_tree.c
new file mode 100644
index 0000000..2500079
--- /dev/null
+++ b/a3/binary_search_tree.c
@@ -0,0 +1,64 @@
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdbool.h>
+
+ 
+#include "binary_search_tree.h"
+#include <stdlib.h>
+
+node_t *create_node(int data) ;
+
+node_t *create_node(int data) {
+    node_t *new_node = (node_t *)malloc(sizeof(node_t));
+ 
+    new_node->data = data;
+    new_node->left = NULL;
+    new_node->right = NULL;
+    return new_node;
+}
+
+
+node_t *build_tree(int *tree_data, size_t tree_data_len) {
+
+
+    node_t *root = create_node(tree_data[0]);
+
+    size_t i = 1;
+while (i < tree_data_len) {
+    node_t *new_node = create_node(tree_data[i]);
+    node_t *current = root;
+
+    while (1) {
+        if (new_node->data <= current->data) {  //porovnanie novy uzol a aktualny
+            if (current->left == NULL) {  
+                current->left = new_node;
+                break;
+            }
+            current = current->left;
+        } else {
+            if (current->right == NULL) {
+                current->right = new_node;
+                break;
+            }
+            current = current->right;
+        }
+    }
+
+    i++;
+}
+    return root;
+}
+
+
+// Function to free the memory allocated for the binary search tree
+void free_tree(node_t *tree) {
+ 
+   free(tree); 
+}
+
+// Function to return sorted data from the binary search tree
+int *sorted_data(node_t *tree) {
+
+    return NULL;
+}
\ No newline at end of file