「atcoder - ABC215G」Colorful Candies 2
link。称题目中的 $c_i$ 为 $a_i$,令 $c_i$ 为第 $i$ 种颜色的出现次数,令 $C$ 为颜色总数。固定 $k$,令 $t_i=1$,如果颜色 $i$ 被选择了一次及以上,...
In mathematics you don't understand things, you just get used to them.
In mathematics you don't understand things, you just get used to them.