Solution Set -「ARC 124」
「ARC 124A」LR ConstraintsLink.我们可以把 $1\sim n$ 个盒子里能放的球的编号集合全部求出来。然后就直接来。注意题目已经给出了 $k$ 个球的位置,所以「Not...
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.