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AI2 如何快捷比较两个列表的差异项,然后再根据差异的项去执行更新操作? -...

有会员提问,如题。目前TA采用的方案是:遍历2个列表全部执行一遍,程序很卡! 解决思路: 这时,我们就会考虑使用字典来解决这个性能问题了,回顾一下文档中字典的特点: https://www.fun123.cn/reference/blocks/dictionaries.html Q...
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appinventor2开发出来的App,可以申请软著和发明专利吗? - App Inventor 2...

用App Inventor 2开发的App可以申请软件著作权(软著),但申请发明专利可能会比较困难,具体情况如下: 1. 软件著作权(软著)可申请: App Inventor 2生成的应用程序,其源代码和界面设计由开发者创作,符合著作权法中的“作...
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Small Haskell program compiled with GHC into huge binary

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What is the difference between map and flatMap and a good use case for each?

... into a single RDD of results. rdd.flatMap(_.split(" ")).collect res2: Array[String] = Array("Roses", "are", "red", "Violets", "are", "blue") We have multiple words per line, and multiple lines, but we end up with a single output array of words Just to illustrate that, flatMapping from a c...
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How to calculate the number of days between two dates? [duplicate]

... const oneDay = 24 * 60 * 60 * 1000; // hours*minutes*seconds*milliseconds const firstDate = new Date(2008, 1, 12); const secondDate = new Date(2008, 1, 22); const diffDays = Math.round(Math.abs((firstDate - secondDate) / oneDay)); ...
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How do I activate C++ 11 in CMake?

...e cmake_minimum_required to require CMake 3.0 or later, or Set policy CMP0025 to NEW with the following code at the top of your CMakeLists.txt file before the project command: # Fix behavior of CMAKE_CXX_STANDARD when targeting macOS. if (POLICY CMP0025) cmake_policy(SET CMP0025 NEW) endif () ...
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Convert object string to JSON

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How to force maven update?

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Error in strings.xml file in Android

... 297 post your complete string. Though, my guess is there is an apostrophe (') character in your st...
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MySQL, update multiple tables with one query

..., we increase the number of books in a particular order with Order.ID = 1002 in Orders table then we also need to reduce that the total number of books available in our stock by the same number in Books table. UPDATE Books, Orders SET Orders.Quantity = Orders.Quantity + 2, Books.InStock = Books....