codeforces 553A – Kyoya and Colored Balls(组合数学+乘法逆元) 题目链接：Kyoya and Colored Balls 【题意】给出K(<=1000)种颜色的球，球的 … 继续阅读“codeforces 553A – Kyoya and Colored Balls(组合数学+乘法逆元)”