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How to automatically generate N “distinct” colors?
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APP INVENTOR硬件交互学习教程04——蓝牙控制继电器 · App Inventor 2 中文网
...主要是设计一个APP，连接蓝牙模块，通过按钮控制继电器的打开和关闭。
一、硬件部分
二、板子程序
串口接收字符，并输出控制继电器
// 引脚定义
const int ledPin1 = 5;// the number of the LED p...
What are the applications of binary trees?
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434
To squabble about the performance of binary-trees is meaningless - they are not a data structu...
Can virtual functions have default parameters?
...ng std::cout;
using std::endl;
struct Base { virtual string Speak(int n = 42); };
struct Der : public Base { string Speak(int n = 84); };
string Base::Speak(int n)
{
stringstream ss;
ss << "Base " << n;
return ss.str();
}
string Der::Speak(int n)
{
stringstream ss;
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Is it faster to count down than it is to count up?
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Norman RamseyNorman Ramsey
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PHP - how to create a newline character?
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648
Only double quoted strings interpret the escape sequences \r and \n as '0x0D' and '0x0A' respec...
How can we match a^n b^n with Java regex?
...n capture inside a non-capturing group. Lookarounds can be repeated.
Step 4: This is the step where we start counting
Here's what we're going to do: we'll rewrite group 1 such that:
At the end of the first iteration of the +, when the first a is matched, it should capture b
At the end of the secon...
What's the best way to convert a number to a string in JavaScript? [closed]
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like this:
var foo = 45;
var bar = '' + foo;
Actually, even though I typically do it like this for simple convenience, over 1,000s of iterations it appears for raw speed there is an advantage for .toString()
See Performance tests here (not by ...
slf4j: how to log formatted message, object array, exception
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435
As of SLF4J 1.6.0, in the presence of multiple parameters and if the last argument in a loggin...
Standard deviation of a list
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Since Python 3.4 / PEP450 there is a statistics module in the standard library, which has a method stdev for calculating the standard deviation of iterables like yours:
>>> A_rank = [0.8, 0.4, 1.2, 3.7, 2.6, 5.8]
>>> impo...