Remove all elements from a linked list of integers that have valueval.
Example
Given:1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6,val= 6
Return:1 --> 2 --> 3 --> 4 --> 5
边界值检查总是有问题， 郁闷！
要判断pre == null的情况！！！
Remove all elements from a linked list of integers that have valueval.
Example
Given:1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6,val= 6
Return:1 --> 2 --> 3 --> 4 --> 5
边界值检查总是有问题， 郁闷！
要判断pre == null的情况！！！
本文标题：203. Remove Linked List Elements
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