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Twitter image encoding challenge [closed]
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The general overview of my solution would be:
I start with calculating the maximum amount of raw data that you can fit into 140 utf8 characters.
(I am assuming utf8, which is what the original website claimed twitter stored it's messages in. This differs from the problem...
Repeat String - Javascript
...cy can be computed by adding in reverse order and using a geometric series starting with a first term a1 = N and having a common ratio of r = 1/2. The sum of a geometric series is given by a_1 / (1-r) = 2N.
This is more efficient than adding one character to create a new string of length 2, creatin...
What is the difference between trie and radix trie data structures?
... Actually in a radix tree you can't have more than a single edge starting with the same letter so you can use the same constant indexing.
– Ivaylo Strandjev
Dec 13 '13 at 6:19
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Why does Java switch on contiguous ints appear to run faster with added cases?
... a switch table (bytecode instruction tableswitch).
However, once the JIT starts its job and compiles the bytecode into assembly, the tableswitch instruction does not always result in an array of pointers: sometimes the switch table is transformed into what looks like a lookupswitch (similar to an ...
mmap() vs. reading blocks
... more-or-less also includes the case where the file wasn't fully cached to start with, but where the OS read-ahead is good enough to make it appear so (i.e., the page is usually cached by the time you want it). This is a subtle issue though because the way read-ahead works is often quite different b...
insert vs emplace vs operator[] in c++ map
...e only two: operator[] and insert (different flavors of insert). So I will start explaining those.
The operator[] is a find-or-add operator. It will try to find an element with the given key inside the map, and if it exists it will return a reference to the stored value. If it does not, it will cre...
Using Auto Layout in UITableView for dynamic cell layouts & variable row heights
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When we scroll , label starts taking appearing in multiple lines and row's height also dowsn't increase
– Karanveer Singh
Jun 18 '19 at 7:00
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Schema for a multilanguage database
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This is an interesting issue, so let's necromance.
Let's start by the problems of method 1:
Problem: You're denormalizing to save speed.
In SQL (except PostGreSQL with hstore), you can't pass a parameter language, and say:
SELECT ['DESCRIPTION_' + @in_language] FROM T_Products
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Callback functions in C++
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I know this is old, but because I almost started doing this and it ended up not working on my setup (mingw), if you're using GCC version < 4.x, this method is not supported. Some of the dependencies I'm using won't compile without a lot of work in gcc version &g...
Unicode equivalents for \w and \b in Java regular expressions?
...iles as matching /^(\X*\R)*\R?$/, but you can’t if you have a \pM at the start of the file, or even of a line. So they’ve eXtended it to always match at least one character. It always did, but now it makes the above pattern work. […continued…]
– tchrist
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