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How to find the kth largest element in an unsorted array of length n in O(n)?
I believe there's a way to find the kth largest element in an unsorted array of length n in O(n). Or perhaps it's "expected" O(n) or something. How can we do this?
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Getting raw SQL query string from PDO prepared statements
...* @param string $query The sql query with parameter placeholders
* @param array $params The array of substitution parameters
* @return string The interpolated query
*/
public static function interpolateQuery($query, $params) {
$keys = array();
# build a regular expression for each parame...
How to make a new List in Java
...
List myList = new ArrayList();
or with generics (Java 7 or later)
List<MyType> myList = new ArrayList<>();
or with generics (Old java versions)
List<MyType> myList = new ArrayList<MyType>();
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Add st, nd, rd and th (ordinal) suffix to a number
...tive integers, see below for other variations)
Explanation
Start with an array with the suffixes ["st", "nd", "rd"]. We want to map integers ending in 1, 2, 3 (but not ending in 11, 12, 13) to the indexes 0, 1, 2.
Other integers (including those ending in 11, 12, 13) can be mapped to anything els...
How do I compare two strings in Perl?
...h hash keys identical [sort keys %$a]~~[sort keys %$b]
Hash Array hash slice existence grep {exists $a−>{$_}} @$b
Hash Regex hash key grep grep /$b/, keys %$a
Hash Any hash entry existence exists $a−>{$b}
Array Array arrays...
p vs puts in Ruby
...ant to make a simple progress bar, using the their close relative, print:
array = [lots of objects to be processed]
array.size
>> 20
This gives the 100% progress bar:
puts "*" * array.size
>> ********************
And this adds an incremental * on each iteration:
array.each do |obj...
Standard alternative to GCC's ##__VA_ARGS__ trick?
... BOOST_PP_GREATER(BOOST_PP_VARIADIC_SIZE(__VA_ARGS__), 1)) \
BOOST_PP_ARRAY_ENUM(BOOST_PP_ARRAY_POP_FRONT( \
BOOST_PP_VARIADIC_TO_ARRAY(__VA_ARGS__)))) \
/**/
Also, why is there no BOOST_PP_ARRAY_ENUM_TRAILING? It would make this solution much less horrible.
Edit: Alright, here ...
how to draw smooth curve through N points using javascript HTML5 canvas?
For a drawing application, I'm saving the mouse movement coordinates to an array then drawing them with lineTo. The resulting line is not smooth. How can I produce a single curve between all the gathered points?
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How to define an empty object in PHP
with a new array I do this:
16 Answers
16
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Convert a JSON String to a HashMap
...;
Object value = object.get(key);
if(value instanceof JSONArray) {
value = toList((JSONArray) value);
}
else if(value instanceof JSONObject) {
value = toMap((JSONObject) value);
}
map.put(key, value);
}
return map;
}
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