Ответ:

 import random

l = [random.randint(0, 1000) for x in range(0, 1000)]

i = 2

length = (len(l))

maximum = l[0]*l[1]

y, z = 0, 1

while i < length:

 x = l[i] * l[i-1]

 if maximum < x:

   maximum = x

   y = i-1

   z = i

 i += 1

print(maximum)

print(y, z)

Объяснение: