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#题目描述：Given a string, find the length of the longest substring without repeating characters. For example, the longest substring without repeating lett... 阅读全文
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#题目简述：Determine whether an integer is a palindrome. Do this without extra space.Some hints:Could negative integers be palindromes? (ie, -1)If you are ... 阅读全文
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#题目简述：Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.For example, given n = 3, a solution set ... 阅读全文
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#题目描述：You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a s... 阅读全文