2 solutions

  • -1
    @ 2023-6-10 12:17:48

    模拟即可。

    • -3
      @ 2023-6-16 11:12:32

      很好，直接 ax−y→axa_x - y \to a_x 即可。

      • 1

      「UOI-R1」询问

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