heap

type Compare[T any] func(x, y T) bool

type Heap[T any] interface {
	// Push return a value into heap
	Push(T)
	// Pop return a value from top of heap,
	//  Attention: pop an empty heap will panic
	Pop() T
	// Peak return the top value of elements in heap
	Peak() *T
	// Len return the length of elements in heap
	Len() int
	// Empty return true if heap is empty
	Empty() bool
}