@[yu__xuan](/user/142110) CF803G by Limit @ 2020-05-30 20:47:00
感谢大佬 by yu__xuan @ 2020-05-30 20:47:35
可持久化线段树其实很板子啊。。。 话说您顺便又提供了一道恶评题 by bellmanford @ 2020-05-30 20:53:16