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The most efficient way to implement an integer based power function pow(int, int)
...tion chain for a¹⁵ above, the subproblem for a⁶ must be computed as (a³)² since a³ is re-used (as opposed to, say, a⁶ = a²(a²)², which also requires three multiplies).
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How do I get user IP address in django?
... answered May 12 '11 at 9:38
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UCenter通信成功，通知失败的解决办法 - 建站技术 - 清泛IT论坛，有思想、有深度
/source/class/discuz/discuz_application.php
注释掉如下3行代码，亲测有效，原因目前未知，有兴趣可以研究一下。
BLE通信数据不能超过20字节？ - 创客硬件开发 - 清泛IT社区，为创新赋能！
有用户反馈，BLE好像有20字节（字符）限制，难道要破开多次传输？如果用专门的安卓调试软件就没问题，用AI2就截断了，只有20字符。
答复：
1-在 ESP32 代码中，我放置了这一行：BLEDevice::setMTU(192);
2- 在应用程序中，我将...
Difference between Big-O and Little-O Notation
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x² ∈ O(200 * x²)
The following are true for little-o:
x² ∈ o(x³)
x² ∈ o(x!)
ln(x) ∈ o(x)
Note that if f ∈ o(g), this implies f ∈ O(g). e.g. x² ∈ o(x³) so it is also true that x² ∈ O(x³), (again, think of O as <= and o as <)
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What is a plain English explanation of “Big O” notation?
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N² → (2N)² = 4(N²)
... I double-cubed (octuple) the time an O(N³) ("cubic time") algorithm takes." (e.g. a problem 100x as big takes 100³=1000000x as long... very unsustainable)
cN³ → c(2N)³ = 8(cN³)
... I add a fixed amount to the time an O(log(N)) ("logarithmic time") al...
我帮儿子用App Inventor 2给遥控车装了"蓝牙大脑"，手机一划车就...
...左右转。听起来简单，但拆解一下核心难点：
1. 双向通信：手机要发送指令给车，车上的单片机要能接收并解析
2. 实时响应：方向盘操作不能有可见延迟
3. 连接稳定：不能玩着玩着就断连
4. 低成本：已有的遥控车不想大...
windows下捕获dump之Google breakpad_client的理解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...CrashGenerationServer类对象。客户进程和服务进程是通过管道通信的，通信可以只发生在客户进程初始化阶段，server进程要先于客户进程启动，否则客户进程就会因为管道连接不上而使用进程内dump捕获。
进程内、外dump捕获，都是...
Node.js throws “btoa is not defined” error
...yB3w7NybGQhIQ==. If you decode this in a browser it will give you Hélló wórld!!. The binary is perfect to ensure cross platform compatibility.
– Iván Alegre
Jun 24 '19 at 8:02
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How to deal with floating point number precision in JavaScript?
... @mlathe: Doh.. ;P... Between 2⁵²=4,503,599,627,370,496 and 2⁵³=9,007,199,254,740,992 the representable numbers are exactly the integers. For the next range, from 2⁵³ to 2⁵⁴, everything is multiplied by 2, so the representable numbers are the even ones, etc. Conversely, for the ...