USACO 2.3 concom
2010-05-17 18:05
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这题观察到有递推关系,以为是DP,不过担心递推会推出环来,产生后效性,于是就用了类似bellman-ford的想法,不断刷新,知道没有更新发生为止。更新的次数有限,所以算法一定会终止。
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