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看清题意了。。。。。开始时候看到那个空行的0，还以为是多余的（居然有这么傻的想法。。）。。后来看准了才发现。，。多组数据。。 最后还是用线段树搞过了。。WA了几次才发现原来多组数据时候要初始化。。 Followed by:
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