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How to implement a queue with three stacks?
...tions behind this link: http://www.eecs.usma.edu/webs/people/okasaki/jfp95/index.html
One of them is O(1) with three stacks BUT it uses lazy execution, which in practice creates extra intermediate data structures (closures).
Another of them is O(1) but uses SIX stacks. However, it works without la...
How can I print a circular structure in a JSON-like format?
... objects
return 'object too long';
}
var printedObjIndex = false;
printedObjects.forEach(function(obj, index){
if(obj===value){
printedObjIndex = index;
}
});
if ( key == ''){ //root element
printed...
setTimeout in for-loop does not print consecutive values [duplicate]
...e around setTimeout:
for (var i = 1; i <= 3; i++) {
(function(index) {
setTimeout(function() { alert(index); }, i * 1000);
})(i);
}
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...
PHP exec() vs system() vs passthru()
...on. cmd is the command to be
executed by the shell. descriptorspec is an indexed array where the
key represents the descriptor number and the value represents how PHP
will pass that descriptor to the child process. pipes will be set to
an indexed array of file pointers that correspond to PHP...
How to prevent favicon.ico requests?
...s tend to request the favicon even if there are no references to it in the index.html file, so how would this solution prevent this? Specifically, I have seen Firefox being very aggressive about requesting it as soon as you visit a domain. Other browsers may do it later, maybe after the index file...
Write a function that returns the longest palindrome in a given string
...s far as I understood the problem, we can find palindromes around a center index and span our search both ways, to the right and left of the center. Given that and knowing there's no palindrome on the corners of the input, we can set the boundaries to 1 and length-1. While paying attention to the mi...
How would I extract a single file (or changes to a file) from a git stash?
...at, when you do a stash, git saves TWO commits -- one for the state of the index and one for the state of the working copy which is a merge between the index and the original HEAD. This explains the odd trees I've seen when I visualize the repository with "gitk --all" when stashes are present.
...
Which is faster: multiple single INSERTs or one multiple-row INSERT?
...: (2)
Parsing query: (2)
Inserting row: (1 × size of row)
Inserting indexes: (1 × number of indexes)
Closing: (1)
From this it should be obvious, that sending one large statement will save you an overhead of 7 per insert statement, which in further reading the text also says:
If y...
Fastest way to extract frames using ffmpeg?
...is is about 20 times faster. We use fast seeking to go to the desired time index and extract a frame, then call ffmpeg several times for every time index. Note that -accurate_seek is the default
, and make sure you add -ss before the input video -i option.
Note that it's better to use -filter:v -fp...
Postgres: How to do Composite keys?
..."tags.tag_id"
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "tags_pkey" for table "tags"
CREATE TABLE
pg=> \d tags
Table "public.tags"
Column | Type | Modifiers
------...