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Knight's Shortest Path on Chessboard
...d be like:
(a1,b3)=1,
(a1,c2)=1,
.....
And the shortest path of two points in a graph can be found using http://en.wikipedia.org/wiki/Dijkstra's_algorithm
Pseudo-code from wikipedia-page:
function Dijkstra(Graph, source):
for each vertex v in Graph: // Initializations
dist...
How do I see if Wi-Fi is connected on Android?
...dManifest.xml for this to work.
NOTE2: public NetworkInfo getNetworkInfo (int networkType) is now deprecated:
This method was deprecated in API level 23. This method does not
support multiple connected networks of the same type. Use
getAllNetworks() and getNetworkInfo(android.net.Network) i...
How to create our own Listener interface in android?
Could someone help me to create user defined listener interface with some code snippets?
9 Answers
...
How do I Search/Find and Replace in a standard string?
...ing some form of regular expression parsing -- instead using only a direct interpretation of the from characters.
– Brent Bradburn
Jun 23 '16 at 14:36
...
Is there a VB.NET equivalent of C# out parameters?
...rect equivalent to C# out function parameters, where the variable passed into a function does not need to be initialised?
...
Full Screen DialogFragment in Android
...
void showDialog() {
FragmentTransaction ft = getFragmentManager().beginTransaction();
DialogFragment newFragment = MyDialogFragment.newInstance();
newFragment.show(ft, "dialog");
}
public static class MyDialogFragment extends DialogFragment {
static MyDialogFragment newInstance()...
What's the @ in front of a string in C#?
... a verbatim string literal - anything in the string that would normally be interpreted as an escape sequence is ignored.
So "C:\\Users\\Rich" is the same as @"C:\Users\Rich"
There is one exception: an escape sequence is needed for the double quote. To escape a double quote, you need to put two dou...
Use cases for the 'setdefault' dict method
...f it's dynamic.
For example, I need a dictionary to map strings to unique ints. defaultdict(int) will always use 0 for the default value. Likewise, defaultdict(intGen()) always produces 1.
Instead, I used a regular dict:
nextID = intGen()
myDict = {}
for lots of complicated stuff:
#stuff that...
How to implement the activity stream in a social network
...activities by activity ID or by using a set of friend IDs with time constraints.
Publish the activity IDs to Redis whenever an activity record is created, adding the ID to an "activity stream" list for every user who is a friend/subscriber that should see the activity.
Query Redis to get the act...
Javascript: negative lookbehind equivalent?
...
Lookbehind Assertions got accepted into the ECMAScript specification in 2018.
Positive lookbehind usage:
console.log(
"$9.99 €8.47".match(/(?<=\$)\d+(\.\d*)?/) // Matches "9.99"
);
Negative lookbehind usage:
console.log(
"$9.99 ...