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add method for heap #520

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add method for heap #520

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21 changes: 21 additions & 0 deletions go/28_heap/heap.go
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,27 @@ func (heap *Heap) removeMax() {
heapifyUpToDown(heap.a, heap.count)
}

//get max
func (heap *Heap) getMax() int {
if heap.count==0 {
return -1
}
return heap.a[1]
}

//get and remove
func (heap *Heap) getAndRemoveMax() int {
var max int
if heap.count == 0 {
return -1
}
max=heap.a[1]
swap(heap.a, 1, heap.count)
heap.count--
heapifyUpToDown(heap.a, heap.count)
return max
}

//heapify
func heapifyUpToDown(a []int, count int) {

Expand Down