1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
package minheap
import (
. "launchpad.net/gocheck"
"testing"
)
func Test(t *testing.T) { TestingT(t) }
type MinHeapSuite struct{}
var _ = Suite(&MinHeapSuite{})
func toEl(i int) interface{} {
return &i
}
func fromEl(i interface{}) int {
return *(i.(*int))
}
func (s *MinHeapSuite) TestPeek(c *C) {
mh := NewMinHeap()
el := &Element{
Value: toEl(1),
Priority: 5,
}
mh.PushEl(el)
c.Assert(fromEl(mh.PeekEl().Value), Equals, 1)
c.Assert(mh.Len(), Equals, 1)
el = &Element{
Value: toEl(2),
Priority: 1,
}
mh.PushEl(el)
c.Assert(mh.Len(), Equals, 2)
c.Assert(fromEl(mh.PeekEl().Value), Equals, 2)
c.Assert(fromEl(mh.PeekEl().Value), Equals, 2)
c.Assert(mh.Len(), Equals, 2)
el = mh.PopEl()
c.Assert(fromEl(el.Value), Equals, 2)
c.Assert(mh.Len(), Equals, 1)
c.Assert(fromEl(mh.PeekEl().Value), Equals, 1)
mh.PopEl()
c.Assert(mh.Len(), Equals, 0)
}
func (s *MinHeapSuite) TestUpdate(c *C) {
mh := NewMinHeap()
x := &Element{
Value: toEl(1),
Priority: 4,
}
y := &Element{
Value: toEl(2),
Priority: 3,
}
z := &Element{
Value: toEl(3),
Priority: 8,
}
mh.PushEl(x)
mh.PushEl(y)
mh.PushEl(z)
c.Assert(fromEl(mh.PeekEl().Value), Equals, 2)
mh.UpdateEl(z, 1)
c.Assert(fromEl(mh.PeekEl().Value), Equals, 3)
mh.UpdateEl(x, 0)
c.Assert(fromEl(mh.PeekEl().Value), Equals, 1)
}
|
