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Artwork Gym - 101550A

Take Your Seat (Floyd)

Half Nice Years Gym - 101840H （点分治 or 并查集）

Safe Racing （ Gym - 101490K ）

The Stream of Corning 2 --- Gym - 102091K（区间第 k 大--权值线段树）

Flying Squirrel --- Gym - 102091A（RMQ + 思维）

Shuffle Cards ( Gym - 247729C )

Shuffle Cards ( Gym - 247729C )

Lucky Pascal Triangle --- Gym - 102091F（找规律 + 递归）

Manhattan Positioning System --- Gym - 101490G