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from random import randint
a=[2, 3, 3, 5,9, 10,13,13,15,19]
i, j, c=0,9,0
key=randint(0,10)
if key>5:key=key+5
while i<=j:
m=(i+j)//2
c+=1
if a[m]>key:
j=m-1
else:
i=m+1
| A．变量c的值一定是4 | B．变量i的值可能是7 |
| C．a[i]的值可能等于key | D．变量m和变量j的值可能相等 |
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
