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Find a pair of elements from an array whose sum equals a given number
... java.util.HashMap;
public class ArrayPairSum {
public static void main(String[] args) {
int []a = {2,45,7,3,5,1,8,9};
printSumPairs(a,10);
}
public static void printSumPairs(int []input, int k){
Map<Integer, Integer> pairs = new HashMap<Integer, Integer&g...
Most efficient way to check for DBNull and then assign to a variable?
...o extension methods:
public static T? GetValue<T>(this DataRow row, string columnName) where T : struct
{
if (row.IsNull(columnName))
return null;
return row[columnName] as T?;
}
public static string GetText(this DataRow row, string columnName)
{
if (row.IsNull(columnNam...
Removing multiple keys from a dictionary safely
...staggering number of people appear unbothered by this :) I don't mind the extra line for existence checking personally, and it's significantly more readable unless you already know about pop(). On the other hand if you were trying to do this in a comprehension or inline lambda this trick could be ...
Log to the base 2 in python
...n_function_or_method
Base Class: <type 'builtin_function_or_method'>
String Form: <built-in function log>
Namespace: Interactive
Docstring:
log(x[, base]) -> the logarithm of x to the given base.
If the base not specified, returns the natural logarithm (base e) of x.
In ...
jQuery scroll to element
... individual element 100 pixels down
Options:
scrollTarget: A element, string, or number which indicates desired scroll position.
offsetTop: A number that defines additional spacing above scroll target.
duration: A string or number determining how long the animation will run.
easing: A string...
What is the difference between related SQLite data-types like INT, INTEGER, SMALLINT and TINYINT?
...e stored as compact varints / float64, and only blob and text is stored as strings
– phiresky
May 17 '19 at 10:12
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Quicksort vs heapsort
...d pivot (yes, there is an overhead to get a good pivot).
static void Main(string[] args)
{
int[] arrToSort = new int[100000000];
var r = new Random();
for (int i = 0; i < arrToSort.Length; i++) arrToSort[i] = r.Next(1, arrToSort.Length);
Console.WriteLine("Press q to quick sort,...
Error during installing HAXM, VT-X not working
...ter and re-install the Intel's HAXM which can be found under ~SDK_LOCATION\extras\intel\Hardware_Accelerated_Execution_Manager. You can also manually download the standalone HAXM installer from Intel's website.
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iPhone App Minus App Store?
... version="1.0">
<dict>
<key>appleId</key>
<string></string>
<key>artistId</key>
<integer>0</integer>
<key>artistName</key>
<string>MYCOMPANY</string>
<key>buy-only</key>
<t...
Practical uses of different data structures [closed]
...they have a continuous memory for them: boolean, char, int, float, double, string.
composite data structures are data structures that are composed of more than one primitive data types.class, structure, union, array/record.
abstract datatypes are composite datatypes that have way to access them effi...