「atcoder - 214G」Three Permutations
la traduction.link。如果我们对于每一个 $k\in[0,n]$ 找到所有满足存在 $k$ 个 $i$ 使得 $r_i=p_i$ 或 $r_i=q_i$ 条件的排列数量,我们就可...
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.