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container/heap: optimization when selecting smaller child

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In down(), if two children are equal, we can choose either one.
Inspired by https://codereview.appspot.com/6613064/

Change-Id: Iaad4ca5e2f5111bf3abb87f606584e7d274c620b
Reviewed-on: https://go-review.googlesource.com/38612
Run-TryBot: Robert Griesemer <gri@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
ltnwgl 2017-03-24 11:55:22 +08:00 committed by Robert Griesemer
parent 716761b8b1
commit f5352a7763
1 changed files with 1 additions and 1 deletions
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src/container/heap/heap.go
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@ -107,7 +107,7 @@ func down(h Interface, i0, n int) bool {
break break
} }
j := j1 // left child j := j1 // left child
if j2 := j1 + 1; j2 < n && !h.Less(j1, j2) { if j2 := j1 + 1; j2 < n && h.Less(j2, j1) {
j = j2 // = 2*i + 2 // right child j = j2 // = 2*i + 2 // right child
} }
if !h.Less(j, i) { if !h.Less(j, i) {