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这个题如果用二维线段树怎么做?

Posted by pony_xoyo at 2010-09-16 16:19:12 on Problem 1151
线段树扫描这个不用说了,我想知道如果要用二维线段树怎么做?四分树好像可以,那树套树可以做吗?求思路…

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