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int Bliskie(drzewo *d, int *x)
{
    int l, p;
    if(d == NULL)
    {
        *x = MAX_INT;
        return -1;
    }
    int wl,wp;
    int l = Bliskie(d->lsyn,&wl);
    int p = Bliskie(d->psyn,&wp);
    if(l == -1){
	*x = wp;
	return p+1;
	}
    if(p == -1){
		*x = wl;
		return l+1;
	}
	*x = min(wl,wp,l+p+2);
    return min(l,p)+1;
}

int BliskieLiscie(drzewo *d){
    int x;
    Bliskie(d, &x);
    if(x == MAX_INT)return 0;
    return x;
}