摘要：
Given a linked list, swap every two adjacent nodes and return its head.For example,Given1->2->3->4, you should return the list as2->1->4->3.Your algor... 阅读全文
posted @ 2014-11-19 14:14
雄哼哼
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摘要：
Given a digit string, return all possible letter combinations that the number could represent.A mapping of digit to letters (just like on the telephon... 阅读全文
posted @ 2014-11-19 10:33
雄哼哼
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