FairRations.py

#!/bin/python3

import math
import os
import random
import re
import sys

#
# Complete the 'fairRations' function below.
#
# The function is expected to return a STRING.
# The function accepts INTEGER_ARRAY B as parameter.
#

def fairRations(B):
    # Write your code here
    total_loaves = 0

    # Check if the sum of the initial loaves is even
    if sum(B) % 2 != 0:
        return "NO"

    for i in range(len(B) - 1):
        if B[i] % 2 != 0:
            B[i] += 1
            B[i + 1] += 1
            total_loaves += 2

    return str(total_loaves)

if __name__ == '__main__':
    fptr = open(os.environ['OUTPUT_PATH'], 'w')

    N = int(input().strip())

    B = list(map(int, input().rstrip().split()))

    result = fairRations(B)

    fptr.write(result + '\n')

    fptr.close()