jteeuwen
The following method signatures do not require pointer receivers, since the IntHeap type is a slice and the methods do not modify the slice itself.
func (ints *IntHeap) Less(i, j int) bool
func (ints *IntHeap) Swap(i, j int)
func (ints *IntHeap) Len() int
Slices and maps are reference types in Go. Only if you are actually changing the value of the 'ints' var, do you need a pointer receiver, like you correctly did in these two:
func (ints *IntHeap) Pop() interface{}
func (ints *IntHeap) Push(x interface{})
