Python | Consecutive element maximum product

Sometimes, we might have a problem in which we require to get the maximum product of 2 numbers from list but with a constraint of having the numbers in successions. This type of problem can occur while competitive programming. Let’s discuss certain ways in which this problem can be solved.

Method #1 : Using max() + zip() + list comprehension

This problem can be solved using the combination of above three function in which max function can be used to get the maximum value, zip and list comprehension doing the task of extending the logic to the whole list.

# Python3 code to demonstrate
# Consecutive element maximum product
# using zip() + max() + list comprehension

# initializing string
test_string = '2312231223124565128998'

# printing original string
print("The original string : " + str(test_string))

# using zip() + max() + list comprehension
# Consecutive element maximum product
test_string = list(test_string)
res = max(int(a) * int(b) for a, b in zip(test_string, test_string[1:]))

# print result
print("The maximum consecutive product is : " + str(res))

Output :

The original string : 2312231223124565128998
The maximum consecutive product is : 81

Method #2 : Using max() + map() + operator.mul

The above problem can also be solved using yet another combination of functions. In this combination, map functions performs the task of extending the logic to whole list and mul operator is used to perform the multiplication.

# Python3 code to demonstrate
# Consecutive element maximum product
# using max() + map() + operator.mul
from operator import mul

# initializing string
test_string = '6543452345456987653234'

# printing original string
print("The original string : " + str(test_string))

# using max() + map() + operator.mul
# Consecutive element maximum product
res = max(map(mul, map(int, test_string), map(int, test_string[1:])))

# print result
print("The maximum consecutive product is : " + str(res))

Output :

The original string : 6543452345456987653234
The maximum consecutive product is : 72