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给自己的提醒,对于这种linkedlist的题目
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.idea/workspace.xml

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RemoveNthNodeFromEndofList.java

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@@ -127,8 +127,10 @@ public ListNode removeNthFromEnd(ListNode head, int n) {
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//陷入了细节之中,肯定过不了了
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//为什么我用数学的方法会错那???
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//1,我没有考虑到null
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//2,(1,2)2
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//1,我没有考虑到null,像写 toDelete.next=toDelete.next.next;这种东西的时候一定要判断会不会是null
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//2,应该大概了解到头也可能被删掉,所以我们需要一个root来管理头
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