diff options
Diffstat (limited to 'libgo/go/container/heap')
| -rw-r--r-- | libgo/go/container/heap/heap.go | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/libgo/go/container/heap/heap.go b/libgo/go/container/heap/heap.go index 5fe23b9..7110c51 100644 --- a/libgo/go/container/heap/heap.go +++ b/libgo/go/container/heap/heap.go @@ -83,8 +83,9 @@ func Remove(h Interface, i int) interface{} { // but less expensive than, calling Remove(h, i) followed by a Push of the new value. // The complexity is O(log(n)) where n = h.Len(). func Fix(h Interface, i int) { - down(h, i, h.Len()) - up(h, i) + if !down(h, i, h.Len()) { + up(h, i) + } } func up(h Interface, j int) { @@ -98,7 +99,8 @@ func up(h Interface, j int) { } } -func down(h Interface, i, n int) { +func down(h Interface, i0, n int) bool { + i := i0 for { j1 := 2*i + 1 if j1 >= n || j1 < 0 { // j1 < 0 after int overflow @@ -114,4 +116,5 @@ func down(h Interface, i, n int) { h.Swap(i, j) i = j } + return i > i0 } |