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二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...说一下二维码一共有40个尺寸。官方叫版本Version。Version 1是21 x 21的矩阵，Version 2是 25 x 25的矩阵，Version 3是29的尺寸，每增加一个version，就会增加4的尺寸，公式是：(V-1)*4 + 21（V是版本号） 最高Version 40，(40-1)*4+21 = 177，所以最高...
iOS UIImagePickerController result image orientation after upload
I am testing my iPhone application on an iOS 3.1.3 iPhone. I am selecting/capturing an image using a UIImagePickerController :
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Fast way of counting non-zero bits in positive integer
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For arbitrary-length integers, bin(n).count("1") is the fastest I could find in pure Python.
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How to enable local network users to access my WAMP sites?
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git stash apply version
...eed to quote "stash@{0}", like zsh, fish and powershell).
Since version 2.11, it's pretty easy, you can use the N stack number instead of using stash@{n}. So now instead of using:
git stash apply "stash@{n}"
You can type:
git stash apply n
To get list of stashes:
git stash list
In fact sta...
Properly removing an Integer from a List
...ments):
remove(Object o)
remove(int index)
That means that list.remove(1) removes the object at position 1 and remove(new Integer(1)) removes the first occurrence of the specified element from this list.
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Inspecting standard container (std::map) contents with gdb
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answered Jan 9 '09 at 10:31
jpalecekjpalecek
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How is “int* ptr = int()” value initialization not illegal?
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int() is a constant expression with a value of 0, so it's a valid way of producing a null poin...
Java - removing first character of a string
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How to filter git diff based on file extensions?
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answered Dec 18 '11 at 21:33
CB BaileyCB Bailey
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