struct element2{
	int label, used;
};
 
struct tree{
	element2 elements[10000];
};
 
tree *InitB(int x, tree *T){
	T = new tree;
	for(int i=0; i<10000; i++){
		T->elements[i].used = 0;
		T->elements[i].label = -1;
	}
	T->elements[1].label = x;
	T->elements[1].used = 1;
	return T;
}
 
int RootB(tree *T){
	return T->elements[1].label;
}
 
int ParentB (int n, tree *T) {
     if (n==RootB(T)) return -1;
     if (n%2) return (n-1)/2;
     else return n/2;
}
 
int LeftChildB(int n, tree *T){
	if(T->elements[n*2].used) return n*2;
	else return -1;
}
 
int RightChildB(int n, tree *T){
	if(T->elements[n*2+1].used) return n*2+1;
	else return -1;
}
 
 
int LabelB(int n, tree *T){
	return T->elements[n].label;
}
 
void ChangeLabelB(int x, int n, tree *T){
	T->elements[n].label = x;
}
 
void CreateLeftB(int x, int n, tree *T){
	if(T->elements[n*2].used) cout << "Mjesto je zauzeto!\n";
	else{
		T->elements[n*2].used = 1;
		T->elements[n*2].label = x;
	}
}
 
void CreateRightB(int x, int n, tree *T){
	if(T->elements[n*2+1].used) cout << "Mjesto je zauzeto!\n";
	else{
		T->elements[n*2+1].used = 1;
		T->elements[n*2+1].label = x;
	}
}
 
void DeleteB(int n, tree *T){
	if(LeftChildB(n, T) != -1) DeleteB(LeftChildB(n, T), T);
	if(RightChildB(n, T) != -1) DeleteB(RightChildB(n, T), T);
	T->elements[n].label = -1;
	T->elements[n].used = 0;
}