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P1875 佳佳的魔法药水
link 看到这个题,很像 dp 但是它可能有环,所以不能 dp。又因为都是正数,可以考虑用 dijkstra 的形式来做 “dp” dijkstra 需要注意的是,做 dijkstra 的时候需要注意一条边x->y只有在x和y都确定了最小值的前提下才能够更新其他点…
oi
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2 years ago
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