阅读体验:https://zybuluo.com/Junlier/note/1297013
一些网上的东西谢谢(丢链接)
- [蛮多](https://www.cnblogs.com/skyfsm/p/6934246.html)
- [pair](https://blog.csdn.net/sinat_35121480/article/details/54728594)
- [string](https://www.cnblogs.com/liutongqing/p/7302022.html)
- [bitset](https://www.cnblogs.com/RabbitHu/p/bitset.html)
- [set&Multiset](https://www.luogu.org/discuss/show/47327)