Complexity of time to resolve restrictions in the physics engine

Erin Catto mentioned in a talk that resolving restrictions requires precisely cubic time and quadratic space. What algorithm are you talking about when you mention cubic time?

Slide PDF with the following quotation:

We can model and program our restrictions perfectly. Good enough to drive a robot arm on an assembly line or
launch a satellite into space. Unfortunately for games, we don't have enough cycles to resolve restrictions precisely.
Resolving restrictions with precision requires cubic time and quadratic space. For the games we do with linear time and
space, so we are constantly struggling with our solvers. The better you understand the constraint solvers, the better
opportunity to create robust simulations in your game.

Proxies must resolve domain IP

What does this "Proxies should resolve domain IP" mean in the proxy configuration?

It is useful

google – Twitter can't resolve the address

There is a website that is distributed through Azure CDN. The CDN endpoint was used as the destination of the CNAME entry for www.< EXAMPLE >.com with the use of Google DNS. The website's www address works fine with one exception, Twitter cannot resolve the address, therefore, cannot read meta tags to generate the call twitter card. In the twitter validation page When you try to validate the previous address, you will return the following message:

ERROR: The page could not be retrieved because the search engine cannot resolve the address.

However, when you enter the CDN endpoint address ( in the same validator, then everything is fine and Twitter can read the content of the website. Also, the debugger to share on Facebook does not complain.

Below you can see dark dig departure for domain.     60                      IN CNAME 1799                 IN CNAME 299              IN CNAME 200                IN CNAME    43                  IN CNAME 223 IN CNAME 236           IN A

What can cause the problem and how can I solve it?

sql server – How to resolve the MDF and LDF files that remain in use?

I am trying to copy approximately 220 gigabytes of MDF and LDF database files from an MS SQL Server 2000 installation to transfer ownership to a third party.

The error I get when I try to stop the database using the company administrator is

Error 1051: A stop control has been sent to a service on which other running services depend

Going to the service and looking at the dependencies tab does not show any other service that runs in relation to it. If I stop the actual Windows service and try to copy it, it tells me that the databases are still in use. I changed the service from automatic to manual and restarted, and it still insists that the files are in use.

I don't particularly care to copy the log files, but how can I solve the error to make a clean shutdown and be able to copy at least the MDF files?

How can I resolve the error when installing expo using this command (npm install expo-cli –global)

A complete record already exists

I tried to reinstall the node, clear the cache, delete the log file specified in the image but I still get the same error

namecoin – (ncdns) Trying to resolve the .bit domain through the dig command, but doesn't get an answer

I am trying to solve the namecoin domain easyminer.bit with ncdns.
The domain is active:

    "name": "d/easyminer",
    "name_encoding": "utf8",
    "value": "{}",
    "value_encoding": "ascii",
    "txid": "23fa46110ab90ba654613774c2c01eb524ab300c3863623b3e6a9388cd479fad",
    "vout": 1,
    "address": "NDxY6mrSYdsTsEYRmA1SNFptW6GCsjuAps",
    "height": 474143,
    "expires_in": 18649,
    "expired": false,
    "ismine": false

When i use the command dig @ -p 1025 easyminer.bit NS However, I don't receive answers, just:

; <<>> DiG 9.14.9 <<>> @ -p 1025 easyminer.bit NS
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 21680
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 080dbfec01213f1c (echoed)
;easyminer.bit.                 IN      NS

;; Query time: 1514 msec
;; WHEN: Fri Jan 31 01:07:40 Mitteleuropõische Zeit 2020
;; MSG SIZE  rcvd: 54

When I solve the domain & # 39; jamieweb.bit & # 39; or & # 39; nf.bit & # 39; I get a record of resources A with the IP address.

Can anyone tell me what the problem seems to be there?

Thanks in advance.


java – Error entering data to arraylist says cant resolve symbol

The idea is a Listview that shows the paintings of a museum. when I put the array with the pictures I get an error, I don't understand why I have a similar exercise and I don't get an error

public class MainActivity extends AppCompatActivity {
    private ArrayList datos = new ArrayList();
    private ListView listCuadros;
    private AdaptadorCuadros adaptador;
    private Context contexto;
    private View tv1;
    protected void onCreate(Bundle savedInstanceState) {
        contexto = this;
        datos.add(new Cuadros(titulo:"La Mona Lisa",autor:"Leonardo da Vinci",estilo:"Renacentista",precio:"$713 millones",fecha:"1503");

This is the class pictures

public class Cuadros {
private String titulo;
private String autor;
private String estilo;
private String precio;
private String fecha;

public Cuadros(String titulo, String autor, String estilo, String precio, String fecha) {
    this.titulo = titulo;
    this.autor = autor;
    this.estilo = estilo;
    this.precio = precio;
    this.fecha = fecha;

public String getTitulo() {
    return titulo;

public void setTitulo(String titulo) {
    this.titulo = titulo;

public String getAutor() {
    return autor;

public void setAutor(String autor) {
    this.autor = autor;

public String getEstilo() {
    return estilo;

public void setEstilo(String estilo) {
    this.estilo = estilo;

public String getPrecio() {
    return precio;

public void setPrecio(String precio) {
    this.precio = precio;

public String getFecha() {
    return fecha;

public void setFecha(String fecha) {
    this.fecha = this.fecha;

And this is the adaptive class for lisview

public class Adapter Spread ArrayAdapter {
      private Activity context;
      private ArrayList data;

AdaptadorCuadros(Activity context, ArrayList datos) {
    super(context, R.layout.listview, datos);
    this.context = context;
    this.datos = datos;

public View getView(int position, View convertView, ViewGroup parent) {
    View item = convertView;
    ViewHolder holder = new ViewHolder();
    if (item == null) {
        LayoutInflater inflater = context.getLayoutInflater();
        item = inflater.inflate(R.layout.listview, null);
        holder.titulo = (TextView) item.findViewById(;
        holder.autor = (TextView) item.findViewById(;
        holder.precio = (TextView) item.findViewById(;
        holder.estilo = (TextView) item.findViewById(;
        holder.fecha = (TextView) item.findViewById(;
    } else {
        holder = (ViewHolder) item.getTag();
    return (item);
static class ViewHolder {
    TextView titulo;
    TextView autor;
    TextView precio;
    TextView estilo;
    TextView fecha;

Use android 7.1.1
enter image description here

Drivers – Davinci Resolve does not start (Aborted (core dump))

I have installed Davinci Resolve 16 with the help of the Linux installer. When I start the program nothing happens. So I decided to check out the registry.
That's why when I run


which begins to resolve, I get this output:

ActCCMessage Already in Table: Code= c005, Mode= 13, Level=  1, CmdKey= -1, Option= 0
ActCCMessage Already in Table: Code= c006, Mode= 13, Level=  1, CmdKey= -1, Option= 0
ActCCMessage Already in Table: Code= c007, Mode= 13, Level=  1, CmdKey= -1, Option= 0
ActCCMessage Already in Table: Code= 2282, Mode=  0, Level=  0, CmdKey= 8, Option= 0
PnlMsgActionStringAdapter Already in Table: Code= 615e, Mode=  0, Level=  0, CmdKey= -1, Option= 0
16.1.2 (#026) Linux/Clang
Main thread starts: 15914C40
(0x7f9315914c40) | Undefined            | INFO  | 2020-01-09 22:15:54,182 | --------------------------------------------------------------------------------
(0x7f9315914c40) | Undefined            | INFO  | 2020-01-09 22:15:54,182 | Loaded log config from /home/flolu/.local/share/DaVinciResolve/configs/log-conf.xml
(0x7f9315914c40) | Undefined            | INFO  | 2020-01-09 22:15:54,182 | --------------------------------------------------------------------------------
Aborted (core dumped)

Maybe the problem occurs because I don't have an NVIDIA GPU (I have Intel Iris Plus graphics). On my other machine with NVIDIA GPU is working fine.

Maybe I need to install a driver for Intel Graphics?

My system:


apt – How to resolve broken packages in the system?

I am aware of the same problem. I made codes according to the same issues, but I think it has become much worse. I am not sure that this affects the same programs or software. Because my script doesn't work anymore but there was no problem before.

The following packages have unmet dependencies:

libpython-stdlib: Depends: libpython2.7-stdlib (>= 2.7.17~rc1-1~) but it is not installed
                  Depends: libpython2-stdlib (= 2.7.17-1) but 2.7.17-1 is installed
libpython2-stdlib: Depends: libpython2.7-stdlib (>= 2.7.17~rc1-1~) but it is not installed
python2.7: Depends: python2.7-minimal (= 2.7.17-1~19.10) but 2.7.17-1~19.10 is installed
           Depends: libpython2.7-stdlib (= 2.7.17-1~19.10) but it is not installed

How to resolve a class conversion exception error for a floating action button

I wanted to use a behavior for the visibility of the floating action button while moving in a nested scrolling view.
The application crashes when the activity starts with the design with the floating action button.