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Fast way of counting non-zero bits in positive integer
I need a fast way to count the number of bits in an integer in python.
My current solution is
9 Answers
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How do I detect unsigned integer multiply overflow?
...ion is likely to overflow, using the positions of the most-significant one-bits in the operands and a little basic binary-math knowledge.
For addition, any two operands will result in (at most) one bit more than the largest operand's highest one-bit. For example:
bool addition_is_safe(uint32_t a, ...
Encrypting & Decrypting a String in C# [duplicate]
...s constant is used to determine the keysize of the encryption algorithm in bits.
// We divide this by 8 within the code below to get the equivalent number of bytes.
private const int Keysize = 256;
// This constant determines the number of iterations for the password bytes g...
Referencing system.management.automation.dll in Visual Studio
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I've installed the SDK on 2 different 64-bit machines (with difficulty) and found the version 6.2.8229.0, 4.66MB dll on only 1, and only in c:\program files (x86)\reference assemblies\microsoft\windowspowershell\v1.0. I highly recommend editing the .csproj file, or...
Why does the C preprocessor interpret the word “linux” as the constant “1”?
...NT_LEAST8_TYPE__ unsigned char
#define __INTMAX_C(c) c ## L
#define __CHAR_BIT__ 8
#define __UINT8_MAX__ 255
#define __WINT_MAX__ 2147483647
#define __ORDER_LITTLE_ENDIAN__ 1234
#define __SIZE_MAX__ 18446744073709551615UL
#define __WCHAR_MAX__ 2147483647
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 1
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How can I configure the font size for the tree item in the package explorer in Eclipse?
...nswered Apr 6 '12 at 16:31
Rick WinscotRick Winscot
58144 silver badges22 bronze badges
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How to request Administrator access inside a batch file
...s script is now slightly edited to support command line arguments and a 64 bit OS.
Thank you Eneerge @ https://sites.google.com/site/eneerge/scripts/batchgotadmin
@echo off
:: BatchGotAdmin
:-------------------------------------
REM --> Check for permissions
IF "%PROCESSOR_ARCHITECTURE%" ...
Should I make HTML Anchors with 'name' or 'id'?
...identifier:
For HTML documents (and the text/html MIME type), the following processing model must be followed to determine what the indicated part of the document is.
Parse the URL, and let fragid be the <fragment> component of the URL.
If fragid is the empty string, then the...
what is faster: in_array or isset? [closed]
...as testing while and foreach that at each refresh I was getting different "winners". it always depend on too many server variables, and the best is to iterate a very large number of times on different times and get the one that win more often, or just know what happening in the background and know ...
Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...iplication, where my answer has a section on why rcpps is not a throughput win anymore. (Or a latency win), and numbers on divide throughput/latency.
– Peter Cordes
Apr 25 '18 at 11:38
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