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题目： Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length. Do not allocate extra spac 阅读全文
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题目： Given a linked list, swap every two adjacent nodes and return its head. For example,Given 1->2->3->4, you should return the list as 2->1->4->3. Yo 阅读全文
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题目： Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists. 链接： 阅读全文
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题目： Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in 阅读全文