nonDivisibleSubset.py

#!/bin/python3

import math
import os
import random
import re
import sys

#
# Complete the 'nonDivisibleSubset' function below.
#
# The function is expected to return an INTEGER.
# The function accepts following parameters:
#  1. INTEGER k
#  2. INTEGER_ARRAY s
#

def nonDivisibleSubset(k, s):
    r = [0] * k
     
    for value in s:
        r[value%k] += 1
     
    result = 0
    for a in range(1, (k+1)//2):
        result += max(r[a], r[k-a])
    if k % 2 == 0 and r[k//2]:
        result += 1
    if r[0]:
        result += 1

    return result

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

    first_multiple_input = input().rstrip().split()

    n = int(first_multiple_input[0])

    k = int(first_multiple_input[1])

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

    result = nonDivisibleSubset(k, s)

    fptr.write(str(result) + '\n')

    fptr.close()