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Given a string, find the length of the longest substring without repeating characters. Examples: Given "abcabcbb", the answer is "abc", which the leng 阅读全文
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Given a non-negative integer represented as non-empty a singly linked list of digits, plus one to the integer. You may assume the integer do not conta 阅读全文
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Write a function to delete a node (except the tail) in a singly linked list, given only access to that node. Supposed the linked list is 1 -> 2 -> 3 - 阅读全文
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Given a singly linked list, determine if it is a palindrome. Follow up: Could you do it in O(n) time and O(1) space? 思路： 一开始我想到的方法伪码如下： while head不空: 阅读全文
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Reverse a linked list from position m to n. Do it in-place and in one-pass. For example:Given 1->2->3->4->5->NULL, m = 2 and n = 4, return 1->4->3->2- 阅读全文
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Write a SQL query to find all numbers that appear at least three times consecutively. For example, given the above Logs table, 1 is the only number th 阅读全文
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参考： https://my.oschina.net/Tsybius2014/blog/493244 常见的排序1. 排名1,2,3，...，n 不对重复的分数做特殊处理 Score Rank 100 1 99 2 99 3 98 4 90 5 排序2. 相同分数排名相同，排名第n名表示前面有n-1 阅读全文
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Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id. Id is the primar 阅读全文
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Given a string which consists of lowercase or uppercase letters, find the length of the longest palindromes that can be built with those letters. This 阅读全文
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Write a SQL query to find all duplicate emails in a table named Person. For example, your query should return the following for the above table: Note: 阅读全文