# Crosscompute
items_text_path = './colors.txt'
k_int = 2

target_folder = './results'

from os.path import join
k, items = k_int, open(items_text_path, 'r').readlines()
target_path = join(target_folder, 'options.csv')

items = [x.strip() for x in items if x.strip()]

n = len(items)

from math import factorial

def binomial_coef(n, k):
    num = factorial(n)
    denom = factorial(k) * (factorial(n - k))
    return int(num / denom)

sol = binomial_coef(n, k)
print('binomial_coefficient = %d' % sol)

from itertools import combinations
possible_choices = (combinations(items, k))

with open(target_path, 'w') as f:
    for choice in possible_choices:
        f.write(','.join(choice) + '\n')

print('choices_table_path = %s' % target_path)