标签归档:离线

[bzoj 1015][JSOI2008] 星球大战

Description

  很久以前,在一个遥远的星系,一个黑暗的帝国靠着它的超级武器统治者整个星系。某一天,凭着一个偶然的机遇,一支反抗军摧毁了帝国的超级武器,并攻下了星系中几乎所有的星球。这些星球通过特殊的以太隧道互相直接或间接地连接。 但好景不长,很快帝国又重新造出了他的超级武器。凭借这超级武器的力量,帝国开始有计划地摧毁反抗军占领的星球。由于星球的不断被摧毁,两个星球之间的通讯通道也开始不可靠起来。现在,反抗军首领交给你一个任务:给出原来两个星球之间的以太隧道连通情况以及帝国打击的星球顺序,以尽量快的速度求出每一次打击之后反抗军占据的星球的连通快的个数。(如果两个星球可以通过现存的以太通道直接或间接地连通,则这两个星球在同一个连通块中)。

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AIO2012 Solution(Chinese)

NORT

It is the year 1982. Malcolm Fraser is the Prime Minister of Australia, you frequently listen to Down Under by Men at Work on your boombox and roller blading is the default mode of transport. As a budding computer scientist, you spend most weekends at the local arcade trying to top your score in the popular video game NORT.

NORT is played on a rectangular grid of square cells with H columns and W rows. You ride a light-bike through the grid, starting in the top-left corner cell. Each second, you can move your light-bike up, down, left or right to any of the four adjacent grid cells (as long as you don't go off the grid!). As you move, your bike's exhaust pipe creates an impenetrable wall of light in the cell you were previously in. If you ever move into a cell containing a wall of light (i.e. a cell you have travelled through before), your bike will disintegrate into pixels in a dramatic 8-bit explosion. The only exception is if you return to the top-left corner cell where you started, in which case the wall of light will be connected and your score for the game will be the total length of wall you have created.

Your goal is therefore to plan the longest possible route through the grid starting and ending in the top-left cell without ever passing through a cell more than once.

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[bzoj 4551][Tjoi2016&Heoi2016] 树

Description

在2016年,佳媛姐姐刚刚学习了树,非常开心。现在他想解决这样一个问题:给定一颗有根树(根为1),有以下
两种操作:1. 标记操作:对某个结点打上标记(在最开始,只有结点1有标记,其他结点均无标记,而且对于某个
结点,可以打多次标记。)2. 询问操作:询问某个结点最近的一个打了标记的祖先(这个结点本身也算自己的祖
先)你能帮帮他吗?

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