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Is it possible to GROUP BY multiple columns using MySQL?
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296
GROUP BY col1, col2, col3
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How to determine the longest increasing subsequence using dynamic programming?
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OK, I will describe first the simplest solution which is O(N^2), where N is the size of the collection. There also exists a O(N log N) solution, which I will describe also. Look here for it at the section Efficient algorithms.
I will assume the indices of the array are from 0 to N - 1...
App Inventor 2 中的“2”是什么意思？ - App Inventor 2 中文网 - 清泛IT...
2010年12月App Inventor对外公测，此版本也称为App Inventor 1 或 App Inventor Classic，简称AI1。
2013年12月App Inventor 2发布，简称AI2。
AI两个版本的区别：
1、功能区别：AI1官方不再开发更新，因此功能及新组件没有AI2多。
2、代码编辑...
App Inventor 2 连接调试器的几种方式的比较 - App Inventor 2 中文网 - 清...
...扫二维码测试；否则使用最新版的AIStarter模拟器也可以。2、对于没有安卓手机的或需要一屏展示效果的，建议第二种：使用商业模拟器，速度快，模拟的场景也较AIStarter模拟器多一些。3、对于学生教学场景，功能测试要求不高...
App Inventor 2 自定义拍照及录像媒体文件的路径，进行目录规整 · App Inventor 2 中文网
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App Inventor 2 自定义拍照及录像媒体文件的路径，进行目录规整
App Inventor 2 自定义拍照图片文件的路径
思路
为什么失败？
什么是A...
Memoization in Haskell?
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259
We can do this very efficiently by making a structure that we can index in sub-linear time.
B...
Algorithms based on number base systems? [closed]
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edited Mar 20 '11 at 7:13
Darius Bacon
14.1k55 gold badges4848 silver badges5252 bronze badges
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Ruby max integer
... big they can be.
If you are looking for the machine's size, i.e. 64- or 32-bit, I found this trick at ruby-forum.com:
machine_bytes = ['foo'].pack('p').size
machine_bits = machine_bytes * 8
machine_max_signed = 2**(machine_bits-1) - 1
machine_max_unsigned = 2**machine_bits - 1
If you are look...
What is the C++ function to raise a number to a power?
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Philipp
1,76644 gold badges2525 silver badges3939 bronze badges
answered May 10 '09 at 19:20
Joey RobertJoey Robert
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