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ZOJ 3261 Connections in Galaxy War (并查集+离线处理)
Description: In order to strengthen the defense ability, many stars in galaxy allied together and built many bidirectional tunnels to exchange messages. However, when the Galaxy War began, some tunn...原创 2019-08-26 15:30:23 · 650 阅读 · 0 评论 -
ZOJ2042 Divisibility(dp)
Description Consider an arbitrary sequence of integers. One can place + or - operators between integers in the sequence, thus deriving different arithmetical expressions that evaluate to different va...原创 2019-04-02 22:04:17 · 601 阅读 · 0 评论 -
ZOJ3469 Food Delivery(区间dp)
Description When we are focusing on solving problems, we usually prefer to stay in front of computers rather than go out for lunch. At this time, we may call for food delivery. Suppose there areNp...原创 2019-04-12 23:10:08 · 691 阅读 · 0 评论