题解 | #大巴车（数组分块，按块翻转，块内不变）#
大巴车（数组分块，按块翻转，块内不变）
https://www.nowcoder.com/practice/a776dfef53914c23a4271fc5fe608369
n2 = int(input().split(' ')[1])
l1 = input().split(' ')
l2 = [l1[i:i+n2] for i in range(0,len(l1),n2)]
print(' '.join([' '.join(j) for j in l2[::-1]]))
