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What is the difference between bottom-up and top-down?
...tree may be infinitely large. Furthermore, in some problems you might not know what the full tree looks like ahead of time. Thus, you might need a strategy/algorithm to decide which subproblems to reveal.)
Memoization, Tabulation
There are at least two main techniques of dynamic programming whic...
Why does one hot encoding improve machine learning performance?
... the constraint w×x + b > 0, or equivalently w×x < b.
The problem now is that the weight w cannot encode a three-way choice. The three possible values of w×x are 0, w and 2×w. Either these three all lead to the same decision (they're all < b or ≥b) or "UK" and "French" lead to the sa...
Git submodule push
...e code in submodule-config in a similar way to fetch.
The git config doc now include:
push.recurseSubmodules:
Make sure all submodule commits used by the revisions to be pushed are available on a remote-tracking branch.
If the value is 'check', then Git will verify that all submo...
Ruby: Can I write multi-line string with no concatenation?
...
In ruby 2.0 you can now just use %
For example:
SQL = %{
SELECT user, name
FROM users
WHERE users.id = #{var}
LIMIT #{var2}
}
share
...
How to select last two characters of a string
...
EDIT: 2020: use string.slice(-2) as others say - see below.
now 2016 just string.substr(-2) should do the trick (not substring(!))
taken from MDN
Syntax
str.substr(start[, length])
Parameters
start
Location at which to begin extracting characters. If a negati...
How can I see the size of a GitHub repository before cloning it?
...
Isn't the size in MB now -> It's not that clear, it looks like it depends on the repo being queried... Small repos expose size in bytes, large ones in megabytes. I've opened an issue at GitHub support. I'll update the answer as soon as the iss...
Why shouldn't Java enum literals be able to have generic type parameters?
Java enums are great. So are generics. Of course we all know the limitations of the latter because of type erasure. But there is one thing I don't understand, Why can't I create an enum like this:
...
What's wrong with cplusplus.com?
... Its because std::remove works with a pair of iterators only and does not know anything about the container which actually contains the items. In fact, it's not possible for std::remove to know the underlying container, because there is no way it can go from a pair of iterators to discover about the...
How do I avoid capturing self in blocks when implementing an API?
...here; the delegate may retain our object but that's out of our hands right now). This code won't risk a leak in the same way, because the value of the delegate property is captured when the block is created, instead of looked up when it executes. A side effect is that, if you change the delegate aft...
When should you use constexpr capability in C++11?
...t b ) { return a * b; }
const int meaningOfLife = MeaningOfLife( 6, 7 );
Now you have something that can be evaluated down to a constant while maintaining good readability and allowing slightly more complex processing than just setting a constant to a number.
It basically provides a good aid to ma...