public MaxHeap(IEnumerable <T> items, IComparer <T> comparer)
{
var negatedComparer = Comparer <T> .Create((x, y) => comparer.Compare(y, x));
minHeap = new MinHeap <T>(items, negatedComparer);
}
public MinHeap(IEnumerable <KeyValuePair <TKey, TValue> > items, IComparer <TValue> comparer)
{
heap = new MinHeap <TKey, TValue, Dictionary <TKey, int> >(items, comparer);
}