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贪心是错误的，附数据每次找到度数为1的点然后把它和相连的点删去的方法是错误的，但是数据比较弱所以能过，下例就不行啦 5 1 4 1 4 2 7 2 7 5 11 5 11 8 13 9 14 9 14 8 13 3 3 3 3 6 6 10 10 12 12 结果应该是(C,3)，但贪心的结果是none Followed by:
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