题目描述：
John is standing at the origin of an infinite two-dimensional grid. He is going to move along this grid. During each second he can either stay where he is or he can move by one unit in one of ...
归档 2015年1月17日
[TopCoder]SRM 646 Div2 The Grid Div Two
[LeetCode]Duplicate Emails
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LeetCode.
题目描述：
Write a SQL query to find all duplicate emails in a table named Person.
+----+---------+ | Id | Email | +----+---------+ | 1 | a@b.com | | 2 | c@d.com | | 3 | a@b.com | +----+---------+ For example, your query should return the following for the above ...