38周赛题解(希望周赛题解一直补下去)
AcWing 4299. 删点
https://www.acwing.com/file_system/file/content/whole/index/content/5621406/
AcWing 4300. 两种操作
https://www.acwing.com/file_system/file/content/whole/index/content/5621504/
AcWing 4301. 截断数列
https://www.acwing.com/file_system/file/content/whole/index/content/5621695/