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Why doesn't Dijkstra's algorithm work for negative weight edges?
... the "closed" nodes is indeed minimal, and thus the node that will next be selected is also minimal.
The idea of it is: If we have a vertex in open such that its cost is minimal - by adding any positive number to any vertex - the minimality will never change.
Without the constraint on positive numb...
Amazon S3 direct file upload from client browser - private key disclosure
... using AWS Signature version 4.
Will summarize here:
As soon as the user selects a file to be uploaded, do the followings:
1. Make a call to the web server to initiate a service to generate required params
In this service, make a call to AWS IAM service to get temporary cred
Once you have the cr...
How to overlay one div over another div
...
Superior answer. Selected answer should be re-assessed.
– AbdulG
May 2 at 13:20
...
Which parallel sorting algorithm has the best average case performance?
...gistration which is free):
University lectures:
Parallel Partitioning for Selection and Sorting
Parallel Sorting Algorithms Lecture
Parallel Sorting Algorithms Lecture 2
Parallel Sorting Algorithms Lecture 3
Other sources and papers:
A novel sorting algorithm for many-core architectures based on ...
ExecuteReader requires an open and available Connection. The connection's current state is Connectin
...on = new SqlConnection(connectionString))
{
var queryString = "SELECT PromotionID, PromotionTitle, PromotionURL FROM Promotion WHERE PromotionID=@PromotionID";
using (var da = new SqlDataAdapter(queryString, connection))
{
// you could also use a SqlDataReader...
Why is Hibernate Open Session in View considered a bad practice?
...e offers @BatchSize for fetching associations in batches, and FetchMode.SUBSELECT to cope with this scenario, the annotations are affecting the default fetch plan, so they get applied to every business use case. For this reason, a data access layer query is much more suitable because it can be tailo...
Does MySQL ignore null values on unique constraints?
... '1' for key 'x'
INSERT table1 VALUES (NULL);
INSERT table1 VALUES (NULL);
SELECT * FROM table1;
Result:
x
NULL
NULL
1
This is not true for all databases. SQL Server 2005 and older, for example, only allows a single NULL value in a column that has a unique constraint.
...
What is @ModelAttribute in Spring MVC?
...the form to display to the user. For example it can be used to fill a HTML select:
2.Method argument
public String findPerson(@ModelAttriute(value="person") Person person) {
//..Some logic with person
return "person.jsp";
}
An @ModelAttribute on a method argument indicates the argument...
IOException: read failed, socket might closed - Bluetooth on Android 4.3
...ect() throws IOException {
boolean success = false;
while (selectSocket()) {
adapter.cancelDiscovery();
try {
bluetoothSocket.connect();
success = true;
break;
} catch (IOException e) {
...
How to store a list in a column of a database table
... the names that you have given to your girl friend id 1 then you can use:
select names from nicknames where id = 1;
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