Python – Maximum Pair Summation in numeric String

Sometimes, we might have a problem in which we require to get the maximum summation of 2 numbers from Strings 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 max value, zip and list comprehension doing the task of extending the logic to the whole list.

# Python3 code to demonstrate
# Maximum Pair Summation in String
# using zip() + max() + list comprehension

# initializing string
test_string = '6543452345456987653234'

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

# using zip() + max() + list comprehension
# Maximum Pair Summation in String
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 sum is : " + str(res))

Output :

The original string : 6543452345456987653234
The maximum consecutive sum is : 17

Method #2 : Using max() + map() + operator.add
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 add operator is used to perform the addition.

# Python3 code to demonstrate
# Maximum Pair Summation in String
# using max() + map() + operator.add
from operator import add

# initializing string
test_string = '6543452345456987653234'

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

# using max() + map() + operator.add
# Maximum Pair Summation in String
res = max(map(add, map(int, test_string), map(int, test_string[1:])))

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

Output :

The original string : 6543452345456987653234
The maximum consecutive sum is : 17