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提示 1: 这个图有什么特点? 提示 2: 如果只有一个连通块,应该怎么处理? 提示 3: 如果有多个连通块呢? 这个图有一个特点,就是每一个点都恰好连出来一条边。如果这些边是没有方向的,则考虑每一个连通块,点数等于边数,因此恰好有一个环。 如果 ...
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