如果数组a(下标1到n)满足a(1)≤a(2)≤…≤a(i-1)≤a(i)≥a(i+1)≥…≥a(n),则称数组a是单峰的,并称a(i)是数组a的“峰顶”。下列程序段用于查找数组a中的“峰顶”,并返回该“峰顶”值。
Dim a(1 To 10) As Integer
Function Search(L As Integer, R As Integer) As Integer
M = (L + R) \ 2
If a(M) < a(M - 1) And a(M) > a(M + 1) Then
⑴
ElseIf a(M) > a(M - 1) And a(M) > a(M + 1) Then
⑵
ElseIf a(M) > a(M - 1) And a(M) < a(M + 1) Then
⑶
End If
End Function
Private Sub Command1_Click()
Label1.Caption = "“峰顶”值是:" + Str(Search(1, 10))
End Sub
上述程序中划线处可选语句为:
①Search = Search(M + 1 , R)
②Search = Search(L , M - 1)
③Search = a(M)
则(1)(2)(3)处的语句依次是( )