diff --git a/a3/program.c b/a3/program.c
index c241a6d..e4e01ce 100644
--- a/a3/program.c
+++ b/a3/program.c
@@ -1,25 +1,37 @@
 #include <stdio.h>
 #include <stdlib.h>
 #define MAX 20
+struct node {
+    int data;
+    struct node* left;
+    struct node* right;
+};
+void preorderTraversal(struct node* root) {
+    if (root == NULL) return;
+    printf("%d", root->data);
+    preorderTraversal(root->left);
+    preorderTraversal(root->right);
+}
 int main() {
 //int l = i * 2 + 1;
 //int r = i * 2 + 2;
+struct node* root;
     int i,n;
     int *a = calloc(MAX, sizeof(int));
     for (i = 0; i < MAX; i++) {
-        scanf("%d", &a[i]);
+        scanf("%d", &root->data);
         if(a[i]!=0){
             n++;
         }
     }
-    //m = buildmaxheap(a, n);
+
     printf("Je to taka kopa:\n");
-    for (i = 0; i < n; i++) {
+    /*for (i = 0; i < n; i++) {
         printf("%d\n", a[i]);
-        if(a[i+1]!=0){//&&a[i+1]>a[i]
-            printf(" ");
+        if(a[i+1]!=0){
         }
-    }
+    }*/
+    preorderTraversal(root);
 
 return 0;
 }
\ No newline at end of file