CF1038B Non-Coprime Partition

### 题目大意： 给定一个整数$n$，要求把$1$到$n$分别放入两个序列$s1,s2$，使得$\gcd(sum(s1),sum(s2))>1$

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In the first example, there is no way to partition a single number into two non-empty sets, hence the answer is "No". In the second example, the sums of the sets are $ 2 $ and $ 4 $ respectively. The $ \mathrm{gcd}(2, 4) = 2 > 1 $ , hence that is one of the possible answers.