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[程序员] 读书时觉得链表相关的算法题太简单了吧，现在只是反转都得绞尽脑汁

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读书时也没怎么训练过 LeetCode ，但那些链表相关的题，比如每 k 个为一组反转，合并 n 链表，觉得真是简简单单。
工作也才没几年，刚刚想反转链表都想了十分钟才将信将疑地写完...

菜了，菜了

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