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 ...
档案日期2015的2
2015年1月12日 - 2015年1月18日
[TopCoder]SRM 646 Div2 The Grid Div Two
[LeetCode]Duplicate Emails
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发布于
在
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, ...
[LeetCode]Employees Earning More Than Their Managers
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LeetCode.
题目描述：
The Employee table holds all employees including their managers. Every employee has an Id, and there is also a column for the manager Id.
+----+-------+--------+-----------+ | Id | Name | Salary | ManagerId | +----+-------+--------+-----------+ | 1 | Joe ...
[TopCoder]SRM 645 Div2 Connecting Cars
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发布于
在
topcoder-srm.
题目描述：
Janusz works in roller coaster maintenance. The station of the roller coaster is a long straight segment of railroad tracks. There are some cars on those tracks. The cars are currently not attached to each other, and there may ...
[LeetCode]Consecutive Numbers
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LeetCode.
题目描述：
Write a SQL query to find all numbers that appear at least three times consecutively.
+----+-----+ | Id | Num | +----+-----+ | 1 | 1 | | 2 | 1 | | 3 | 1 | | 4 ...