/                                        /|
          /                                        / |
         /                                        /  |
        +----------------------------------------+   |
        |                                        |   |
        |                                        |   |
        |                                        |   |
        |         ###    #####   ###             |   |
        |         #  #     #     #  #            |   |
        |         ###      #     ###             |   |
        |         # #      #     #               |   |
        |         #  # # ##### # #    #          |   |
        |                                        |   |
        |         Unknown_Error's grave          |   |
        |                                        |   |
        |                                        |   |
        | Famous saying:Luogu will be notorious  |   |
        |                                        |   |
        |                  ----                  |   |
        |                  ||||                  |   |
        |                  ||||                  |   |
        |                  ||||                  |   |
        |            ------||||------            |   |
        |            ||||||||||||||||            |   |
        |            ------||||------            |   |
        |                  ||||                  |   |-------------------+
        |                  ||||                  |   |                  /|
        |                  ||||                  |   |                 / |
       /|                  ||||                  |   |                /  +
      / |                  ||||                  |   |               /  /
     /  |                  ----                  |   |              /  /
    /   |                                        |   |             /  /
   /    |     Made by andyzhu444(uid:575655)     |   |            /  /
  /     |                                        |   |           /  /
 /      |         Want to know anymore?          |   +          /  /
/       |    See "BV1fb411w7Qj" in bilibili.     |  /          /  /

/ | | / / / / | |/ / / / +----------------------------------------+ / / / / /```