Submission #993001

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Source Code Expand

#!/usr/bin/env python3
# -*- coding:utf-8 -*-

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

from collections import Counter
N, M = map(int, input().split())
X = list(map(lambda x: int(x) % M, input().split()))

# print(Counter(X))
c = Counter(X)
cnt = c[0] // 2
for i in range(1, M//2):
    # print(i, M-i, c[i], c[M-i])
    cnt += min(c[i], c[M-i])
cnt += c[M//2] // 2
print(cnt)

Submission Info

Judge Result