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描述 Given a word, you need to judge whether the usage of capitals in it is right or not. We define the usage of capitals in a word to be right when one 阅读全文
摘要：
描述 You are given a string representing an attendance record for a student. The record only contains the following three characters: 'A' : Absent. 'L' 阅读全文
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描述 Remove all elements from a linked list of integers that have value val. Example Given: 1 2 6 3 4 5 6, val = 6 Return: 1 2 3 4 5 分析 先构造一个链表结点 dummyH 阅读全文