codeforces global round 17D
题解 https://codeforces.com/blog/entry/97179
https://zhuanlan.zhihu.com/p/436830361
https://www.bilibili.com/read/cv14148504?spm_id_from=333.999.0.0
https://www.bilibili.com/video/BV1xM4y1P7xj?from=search&seid=3351367881702448303&spm_id_from=333.337.0.0
NOIP2021棋局
题目
似乎是启发式合并的数据结构,,不会做