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How to find all combinations of coins when given some dollar value
...e Mathematica source.
By using generating functions, you can get a closed-form constant-time solution to the problem. Graham, Knuth, and Patashnik’s Concrete Mathematics is the book for this, and contains a fairly extensive discussion of the problem. Essentially you define a polynomial where the ...
UUID max character length
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Section 3 of RFC4122 provides the formal definition of UUID string representations. It's 36 characters (32 hex digits + 4 dashes).
Sounds like you need to figure out where the invalid 60-char IDs are coming from and decide 1) if you want to accept them, and...
Multiple working directories with Git?
.../other-linked-worktree 1234abc (detached HEAD)
There is also porcelain format option available.
The porcelain format has a line per attribute.
Attributes are listed with a label and value separated by a single space.
Boolean attributes (like 'bare' and 'detached') are listed as a label o...
When using Spring Security, what is the proper way to obtain current username (i.e. SecurityContext)
...ments UserDetails that is returned by a custom UserDetailsService.
More information can be found in the @AuthenticationPrincipal chapter of the Spring Security reference docs.
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Any reason not to use '+' to concatenate two strings?
... you might want to think something else.
''.join([a, b, c]) trick is a performance optimization.
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Incrementing in C++ - When to use x++ or ++x?
...e 32:
From your days as a C programmer, you may recall that the prefix form of the increment operator is sometimes called "increment and fetch", while the postfix form is often known as "fetch and increment." The two phrases are important to remember, because they all but act as formal specific...
How to tell if a string is not defined in a Bash shell script
...for the section "Parameter Expansion" and then for this text: "When not performing substring expansion, using the forms documented below, bash tests for a parameter that is unset or null ['null' meaning the empty string]. Omitting the colon results in a test only for a parameter that is unset (...) ...
BCL (Base Class Library) vs FCL (Framework Class Library)
...Library (FCL) is the wider library that contains the totality: ASP.NET, WinForms, the XML stack, ADO.NET and more. You could say that the FCL includes the BCL.
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iPad Web App: Detect Virtual Keyboard Using JavaScript in Safari?
...lanation (if you research and write one, I'd love to read it). The two platforms handle onscreen keyboards in their main browsers very differently. Android Chrome shrinks the viewport height to make room for the keyboard, so the page resizes when the keyboard is shown. iOS Safari overlays the page w...
Java equivalent of C#'s verbatim strings with @
...age that does, however, you might want to look at Groovy which has various forms of string literal.
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