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HashMap get/put complexity
...te hashCode() of the lookup element, which means we might have to traverse arrays and lists in our algorithm.
Lets assume that the size of all of the above arrays/lists is k.
Then, HashMap<String, V> and HashMap<List<E>, V> will have O(k) amortised complexity and similarly, O(k +...
Why doesn't java.util.Set have get(int index)?
... structure itself. Two of the three commonly used implementations of List (ArrayList and Vector) are random-access, but that does not make random access a property of Lists.
– Michael Myers♦
Aug 5 '12 at 4:29
...
How can I parse a local JSON file from assets folder into a ListView?
...
JSONObject obj = new JSONObject(loadJSONFromAsset());
JSONArray m_jArry = obj.getJSONArray("formules");
ArrayList<HashMap<String, String>> formList = new ArrayList<HashMap<String, String>>();
HashMap<String, String> m_li;
for (i...
must appear in the GROUP BY clause or be used in an aggregate function
...ed field aggregated as well.
In posgres, this should work:
SELECT cname, (array_agg(wmname ORDER BY avg DESC))[1], MAX(avg)
FROM makerar GROUP BY cname;
Note that this creates an array of all wnames, ordered by avg, and returns the first element (arrays in postgres are 1-based).
...
How can we match a^n b^n with Java regex?
...$groups);
print("$test $isMatch $groupsJoined\n");
}
}
$tests = array('aaa', 'aaab', 'aaaxb', 'xaaab', 'b', 'abbb');
$r1 = '/^a+(?=b+)/';
# └────┘
# lookahead
testAll($r1, $tests);
The output is (as seen on ideone.com):
aaa 0
aaab 1 aaa
aaaxb 0
xaaab 0
b 0...
Map Tiling Algorithm
...t be difficult to rewrite in JS.
var tileDimension:int = 20;
var levelNum:Array = new Array();
levelNum[0] = [1, 1, 1, 1, 1, 1, 1, 1, 1];
levelNum[1] = [1, 0, 0, 0, 0, 0, 0, 0, 1];
levelNum[2] = [1, 0, 1, 1, 1, 0, 1, 0, 1];
levelNum[3] = [1, 0, 1, 0, 1, 0, 1, 0, 1];
levelNum[4] = [1, 0, 1, 0, 0, 0...
Create Generic method constraining T to an Enum
...uetype [mscorlib]System.RuntimeTypeHandle)
call class [mscorlib]System.Array [mscorlib]System.Enum::GetValues(class [mscorlib]System.Type)
callvirt instance class [mscorlib]System.Collections.IEnumerator [mscorlib]System.Array::GetEnumerator()
stloc enumerator
.try
{
CONDI...
Proper stack and heap usage in C++?
...ensible compilers, to allocate non-fixed size objects on the heap (usually arrays whose size is not known at compile time).
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PDO closing connection
...
public function __construct($dsn, $username = null, $password = null, array $options = null) {
parent::__construct($dsn, $username, $password, $options);
}
static function getNewConnection() {
$conn=null;
try {
$conn = new CMyPDO("mysql:host=$host;db...
Accessing dict keys like an attribute?
...
You can have all legal string characters as part of the key if you use array notation.
For example, obj['!#$%^&*()_']
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