噫，蒟蒻手残发错题目了
by Chthology @ 2017-10-25 17:09:25
......
by hjfzzm @ 2017-10-25 17:49:49
然而这题的确是暴力模拟过的。。。
by Chthology @ 2017-10-25 17:54:58
@[Chthology](/space/show?uid=52476) 可以可以~~（你让本来看到数据范围放弃打暴力的我重拾了信心）~~
by 青珹 @ 2018-03-05 11:08:13