diff --git a/a4/program.c b/a4/program.c
new file mode 100644
index 0000000..d83a70d
--- /dev/null
+++ b/a4/program.c
@@ -0,0 +1,72 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define SIZE 20
+
+int checkMinHeap(const long* arr, const int size){
+    for (int i = 0; i<=(size-2)/2; i++) {
+        if(arr[2*i] < arr[i]) return -1; 
+        if(arr[2*i+1] < arr[i]) return -1;
+    }
+    return 1;
+}
+
+long int* strToInt(const char* chArr){
+    int j =  strlen(chArr);
+    //int i = 0;
+    //printf("dlength %d\n",j/2-1);
+    long int* dArr = (long int*)calloc(j,sizeof(long)); 
+    char* pEND;
+    for(int i=0; i<j; i++){
+        dArr[i] = strtol(chArr, &pEND, 10);
+        //printf("%ld \n", dArr[i]);
+        if(dArr[i] == 0) break;
+        chArr = pEND; 
+    }
+ /*   for(int i = 0; i<j/2-1; i++){
+        printf("%ld ", dArr[i]);
+    }*/
+    return dArr;
+}
+
+void print_tree(const long* arr){
+    int offset = 0;
+    int j =0;
+    while(j != sizeof(&arr)/sizeof(arr[0])){
+    for (int i = 0; i < offset; i++){
+        printf(" ");
+    }
+    printf("%ld\n",arr[j]);
+    offset+=1;
+    for (int i = 0; i < offset; i++){
+        printf(" ");
+    }
+    printf("%ld\n",arr[j*2+1]);
+    for (int i = 0; i < offset; i++){
+        printf(" ");
+    }
+    printf("%ld\n",arr[j*2+2]);
+    j++;
+    offset+=1;
+    }
+}
+
+int main(){
+    char chArr[SIZE];
+    while(1){
+        char* r = fgets(chArr, SIZE, stdin);
+        if(r == NULL){
+            break;
+        }
+    }
+    long int* dArr = strToInt(chArr);
+    
+    int heap = checkMinHeap(dArr, sizeof(&dArr)/sizeof(long));
+    if(heap == 1){
+        printf("Je to taka kopa:\n");
+        print_tree(dArr);
+    }
+    free(dArr);
+    return 0;
+}
\ No newline at end of file