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是这个样子的,把一个操作变成四个操作,查询的时候只要计算总共对这个点进行了多少次操作就可以了

Posted by frkstycFans at 2006-10-06 22:48:17 on Problem 2155
In Reply To:那要把一个矩形内的元素全部置反怎么操作?求一个元素是否还需要求四个矩形然后利用容斥原理去计算,实在想不到好办法? Posted by:nuanran at 2006-10-06 20:58:42


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