今際の国の呵呵君
Sunday, January 11, 2015
[LeetCode]Remove Nth Node From End of List
双指针找到倒数第N + 1个节点，然后通过这个这节点删除倒数第N个节点。注意head有可能会被删除，我们需要用一个helper节点来帮我们keep track of新的head。O(N)时间，常数空间。代码如下：
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