搜索
L= 1:R=n
Do While L<R
imin_l = L:imin_2=R
For i=L +1 To R
If a（i）< a （imin_1）Then
imin_ 2 = imin_ 1
imin_1=i
ElseIf a(i) < a(imin. _2) Then
imin_ 2= i
End If
Next i
If imin _1 <> L Then t = a(imin_ 1): a(imin_ 1) = a(L): a(L) = t
________________________
If imin_ 2 <> R Then t = a(imin_ 2): a(imin_ 2) = a(R): a(R) = t
L=L+1:R=R-1
Loop
| A．If imin_1=L Then imin_1=imin_2 |
| B．If imin_1=L Then imin._2=imin_1 |
| C．If imin_2=L Then imin_1=imin_2 |
| D．If imin_2=L Then imin_2=imin_1 |
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
