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How does Dijkstra's Algorithm and A-Star compare?
...kstra is a special case for A*.
Dijkstra finds the minimum costs from the starting node to all others. A* finds the minimum cost from the start node to the goal node.
Dijkstra's algorithm would never be used for path finding. Using A* one can come up with a decent heuristic. Depending on the searc...
Java Reflection Performance
... }
public static void doRegular() throws Exception
{
long start = System.currentTimeMillis();
for (int i=0; i<1000000; i++)
{
A a = new A();
a.doSomeThing();
}
System.out.println(System.currentTimeMillis() - start);
}
...
How to make a countdown timer in Android?
... as seconds. After clicking the finish button, the seconds EditText should start to countdown and update its text every second.
...
Android ImageView Zoom-in and Zoom-Out
...tF objects are used to record the point(s) the user is touching
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCrea...
Error: Cannot pull with rebase: You have unstaged changes
I have started collaborating with a few friends on a project & they use the heroku git repository.
8 Answers
...
IllegalMonitorStateException on wait() call
...ew Thread(new Runnable(){
public void run() { // do stuff }});
thread.start();
...
thread.wait();
There are three problems.
As others have said, obj.wait() can only be called if the current thread holds the primitive lock / mutex for obj. If the current thread does not hold the lock, you...
System.currentTimeMillis() vs. new Date() vs. Calendar.getInstance().getTime()
...nt in time when interpreted as the seconds or milliseconds since an "epoch start". In other words, currentTimeMillis() returns a timestamp.
– Michael Borgwardt
Oct 6 '18 at 8:35
...
How can I get a count of the total number of digits in a number?
...t.MaxValue);
Stopwatch sw1 = new Stopwatch();
sw1.Start();
for (int i = 0; i < size; ++i) samples[i].Digits_IfChain();
sw1.Stop();
Console.WriteLine($"IfChain: {sw1.ElapsedMilliseconds} ms");
Stopwatch sw2 = new Stopwatch()...
How can I convert an RGB image into grayscale in Python?
...times = dict(sk=list(), pil=list(), scipy=list())
for t in range(100):
start_time = time.time()
for i in range(1000):
z = random.choice(filenames_png)
img = skimage.color.rgb2gray(skimage.io.imread(z))
run_times['sk'].append(time.time() - start_time)
start_time = time.ti...
Can't connect to local MySQL server through socket '/tmp/mysql.sock
...
sudo /usr/local/mysql/support-files/mysql.server start
This worked for me. However, if this doesnt work then make sure that mysqld is running and try connecting.
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