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题解 by @ezoilearner，你可以通过以下联系方式联系作者：
题意:给一个完全图，每条边要么是蓝色，要么是黄色。
定义 $A$ 为四个点的生成子图，满足其中五条边颜色一样剩下一条边颜色不一样，的个数。
定义 $B$ 为四个点的生成子图，满足不同颜色数五五开，且不会有个颜色形成同色三角形，的个数。
求 $A-B$ .
$n\leq 2000$
题解:计算两种情况的数量
2 $\times$ 一种颜色的边形成了十字架 $+$ 一种颜色的边恰有一种(即 $A$ )
4 $\times$ 一种颜色的边形成了十字架 $+$ 2 $\times$ B
时间复杂度 $O(\frac{n^3}{w})$
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