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時(shí)長:00:00更新時(shí)間:2020-11-09 08:02:36
codeforcesRound#260(div2)E解題報(bào)告:Andrew plays a game called Civilization. Dima helps him. The game has n cities and m bidirectional roads. The cities are numbered from 1 to n . Between any pair of cities there either is a single (unique) path, or there is no path at all.
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