RoyalUp's questions

For example I have this:

{[dificultad, adios]=["baja", "a"], 
 [dificultad, adios]=["baja", "a"], 
 [dificultad, adios]=["alta", "abckdk"]}

that is, a Map<List<String>, List<String>>, what I want to do and I can't do is, for example, if in the map, if there are identical keys and values ​​that are deleted and there is only one element of them.

Expected output:

{[dificultad, adios]=["baja", "a"], [dificultad, adios]=["alta", "abckdk"]}
                                                        

It is failing me when creating a table, the code is this:

public class MoviesCreateTable {

    public static void main(String[] args) throws Exception {

        AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard().withEndpointConfiguration(
                new AwsClientBuilder.EndpointConfiguration("http://localhost:8000", "us-east-2")).build();
        System.out.println("registra bien");
        DynamoDB dynamoDB = new DynamoDB(client);
        System.out.println("se conecta con la bdd");
        String tableName = "Movies";

        try {
            System.out.println("Attempting to create table; please wait...");
            Table table = dynamoDB.createTable(tableName, 
                    //partition key
                    Arrays.asList(new KeySchemaElement("year", KeyType.HASH), new KeySchemaElement("title", KeyType.RANGE)), // Sort key
                    
                    Arrays.asList(new AttributeDefinition("year", ScalarAttributeType.N),new AttributeDefinition("title", ScalarAttributeType.S)),
                    new ProvisionedThroughput(10L, 10L));
            table.waitForActive();
            System.out.println("Success.  Table status: " + table.getDescription().getTableStatus());

        } catch (Exception e) {
            System.err.println("Unable to create table: ");
            System.err.println(e.getMessage());
        }

    }
}

This is the log I get:

registra bien
se conecta con la bdd
Attempting to create table; please wait...
Unable to create table: 
Unable to execute HTTP request: Connect to localhost:8000 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused: connect

EDIT2 : I HAVE FOUND THE SOLUTION IN CASE SOMEONE SERVES HIM,

I have simply removed the client line, because there I was testing on localhost and I have replaced it with this:

AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard()
.withRegion(Regions.US_WEST_2)
.build();

I have this matrix and I would like to cross out rows and columns (not including the ti and ai variable names, but I have no idea.

\documentclass{article}
\usepackage{amsmath}% http://ctan.org/pkg/amsmath
\usepackage{ulem}
\usepackage{kbordermatrix}% http://www.hss.caltech.edu/~kcb/TeX/kbordermatrix.sty
\usepackage{soul}
\begin{document}

    \renewcommand{\kbldelim}{(}% Left delimiter
    \renewcommand{\kbrdelim}{)}% Right delimiter
    \[
    \text{matriz} = \kbordermatrix{
        & t1 & t2 & t3 & t4 & t5 \\
        a1 & 1 & 1 & 1 & 1 & 0 \\
        a2 & 0 & 1 & 14 & 99 & 0 \\
        a3 & 0 & 0 & 1 & 0 & 0 \\
        a4 & 0 & 0 & 0 & 1 & 0 \\
        a5 & 30 & 155 & 0 & 0 & 0
    }
    \]

\end{document}

I am using the auto py to exe library to pass a file from python to .exe . But when converting test.py I get an error and it gives me this Traceback that I don't know what it could be due to.

File "c:\python\python37\lib\site-packages\PyInstaller\lib\modulegraph\modulegraph.py", line 1638, in _find_head_package
    target_module_headname, target_package_name, source_package)
  File "c:\python\python37\lib\site-packages\PyInstaller\depend\analysis.py", line 382, in _safe_import_module
    module_basename, module_name, parent_package)
  File "c:\python\python37\lib\site-packages\PyInstaller\lib\modulegraph\modulegraph.py", line 2055, in _safe_import_module
    module_name, file_handle, pathname, metadata)
  File "c:\python\python37\lib\site-packages\PyInstaller\lib\modulegraph\modulegraph.py", line 2093, in _load_module
    m = self._load_package(fqname, pathname, packagepath)
  File "c:\python\python37\lib\site-packages\PyInstaller\lib\modulegraph\modulegraph.py", line 2912, in _load_package
    self._load_module(fqname, fp, buf, stuff)
  File "c:\python\python37\lib\site-packages\PyInstaller\lib\modulegraph\modulegraph.py", line 2105, in _load_module
    co = compile(contents, pathname, 'exec', ast.PyCF_ONLY_AST, True)
ValueError: source code string cannot contain null bytes

It is a longer error trace but I put only part of it. I put the project structure in which I only use the img package , the other python files I don't use, I just want to pass the tests.py . mainClass and preprocessing I don't use them at all. What is causing this error?

Well this is the error I get when I run protractor:

Failed: Angular could not be found on the page http://localhost:8080/ . If this is not an Angular application, you may need to turn off waiting for Angular.

The only thing I've done is change node versions to 7 , and install protractor and phantomjs , and when I run the protractor tests/tests.js command I get that error.

tests.js:

exports.config = {
    seleniumAddress: 'http://localhost:4444/wd/hub',
    chromeOnly: true,
    specs: ["e2e/TC01-loadFilm.js"]

};

AngularJS and Bootstrap is installed in a /public folder, both my /public and /tests folders are in the root of the project, I don't know if that will be the problem.

i have this code

takings-app.js:

angular
    .module("TakingsApp",["ngRoute"])
    .config(function($routeProvider){ 
        $routeProvider
            .when("/",{
               controller: "ListCtrl",
               templateUrl:"listTaking.html"   //cargar esta vista(templateUrl) con este controlador
            })
            .when("/edit/:film",{
                controller:"EditCtrl",
                templateUrl:"editTaking.html"
            });
    });

console.log("TakingsApp initialized.");

editTaking-control.js:

/* global angular */

    angular
        .module("TakingsApp")
        .controller("EditCtrl",
                        ["$scope",
                        "$http", 
                        "$routeParams",
                        "$location",
        function ($scope,$http,$routeParams,$location){
            console.log("Edit Controller initialized.");

listTaking-ctrl.js:

var app = angular.module("TakingsApp");

  app.controller("ListCtrl", ["$scope", "$http", function($scope, $http) {
      console.log("ListCtrl initicialized!");

Google console output:

I have put the initializations only of the .js files, since the error is supposedly from the initialization of the module or some controller but I don't know the truth. In what error?

index.html:

<html ng-app="TakingsApp">

<head>
    <title>Ingresos cine español</title>
    <link rel="stylesheet" href="/bower_components/bootstrap/dist/css/bootstrap.min.css">
    <script src="/bower_components/bootstrap/dist/js/bootstrap.min.js"></script>
    <script src="/bower_components/angular/angular.min.js"></script>
    <script src="/bower_components/angular-route/angular-route.min.js"></script>
    <script src="editTaking-ctrl.js"></script>
    <script src="listTaking-ctrl.js"></script>

</head>

</head>

<body ng-view>

    </body>

I have two lists of the same length, and I want to count the number of positions in which the elements of both lists match. I've done something like this but I think it doesn't make much sense:

def cuenta_coincidentes(l1,l2):
res=0;
for x in l1:
    for y in l2:
        if l1.index(x)==l2.index(y):
            res+=1;
return res;

I have this code in Java:

for(int i=0;i<num;i++){
        if(i!=0){
            r = r + "+";
        }
        if(ProblemaVagones.listaVagones.get(i).isElectricidad()){
            r = r + "x" + i;
            r.substring(0, r.length()-1);       
        }
    }

My output from this piece of code is this:

x0+x1+x2+<=2;

Which is wrong because at the end it has a "+" that is left over, I have tried to make a substring from 0 to the penultimate element of the string to remove it, from what you see it does not work. Does anyone see the error?

private static String invertirPalabra(String palabra) {
    String res = "";

    if(palabra.length()==0){
        res = palabra;
    }else{
        res = invertirPalabra(palabra.substring(1)+ palabra.charAt(0));

    }
    return res;
}

When doing this method of inverting a word, I get the StackOverFlow error. I guess it must have gone off the chain or something, but I don't know exactly what the error is.

Exception in thread "main" java.lang.StackOverflowError
  at java.lang.String.<init>(Unknown Source)
  at java.lang.String.substring(Unknown Source)
  at Ejemplo2.invertirPalabra(Ejemplo2.java:70)

This is my code for a recursive function written in non-final form, I would like to make it iterative with a while , but I really can't do it, advice to do it with bottom-up? The abc method is a square root(x) , and the number of iterations performed (n) , the higher the iteration the better the result.

public static Double abc(int x,int n){
    Double d = .0;
    if(n==0){ //caso base
        d = 1.0;
    }else{
        d = (abc(x,n-1)+(x/abc(x,n-1)))/2;
    }
    return d;
}

This is what I have tried with the while loop:

  public static Double abcIter(Integer x,Integer n){                 
    Double res = 1.0;
    Double r0=.0;
    Integer numeroAuxiliar = 0;

        while(numeroAuxiliar<=n){

            res = (res+(x/res))/2;
            r0 = res;
            res = (r0+(x/r0))/2;
            numeroAuxiliar++;
        }


    return res;
}

When I try some root and iteration with the while it doesn't give me the exact value. On the other hand, the first method works well for me. Tips on the while method, and bottom-up?

I have a method that receives a LocalTime object, and that returns a String , the objective of this method is that when receiving a time it is for example --> 13:00 returns("It is 13 o'clock") , another example would be - -> 17:08("It is 17 and 8"). Where should I start? Passing the LocalTime object to a String?

EDIT I ​​think I've already got the answer, I'm posting it in case someone wants to know.

private static String generaTextoHora(LocalTime tiempo){

    Integer hora = tiempo.getHour();
    Integer minutos = tiempo.getMinute();
    String mensaje = "";
    if(minutos==00){
        mensaje = "son las " + hora + " en punto";
    }else if(minutos>0 && minutos <15){
        mensaje = "son las " + hora + " y " + minutos;
    }else if(minutos==15){
        mensaje = "son las " + hora +" y cuarto";
    }else if(minutos>15 && minutos>30){
        mensaje = "son las " + hora + " y " + minutos;
    }else if(minutos==30){
        mensaje = "son las" + hora + " y media";
    }else if(minutos>30 && minutos<=59){
        mensaje = "son las" + hora + " y " + minutos;
    }
    return mensaje;
}

I am a SQL beginner and I am creating a table, my doubt is that I have defined my StartTime and EndTime as VARCHAR2 to introduce a time, which correspond to some classes (of a gym), that it would be more correct to create it with some type time , or with VARCHAR2 and introduce StartTime and EndTime to each class manually with an INSERT INTO?

CREATE TABLE CLASES(
OID_CL SMALLINT,
nombre VARCHAR2(20),
horaInicio VARCHAR2(10),
horaFin VARCHAR2(10),
disponibilidadClase VARCHAR2(20),
codigo VARCHAR2(6),
PRIMARY KEY(OID_CL),
FOREIGN KEY(codigo) REFERENCES REGISTRO_CLASES
);

removeAll(Collection c) Removes all objects from the calling collection that are in c.

retainAll(Collection c) In the collection that invokes only those objects that are in c.(intersection) will remain

My question is, do they work the same way? Since retainAll has to remove uncommon elements, and removeAll does the action set above

Hi, I have a question and I don't know how stderr from the stdio.h library and fprintf() from string.h are used . For example I have this:

fprintf(stderr, "Error en planta de Centro: %d\n", numeroPlantas);

Where numberPlants is an int . I would like you to clarify when they are usually used and their meaning if possible.

I have a doubt and it is that when working with maps I don't know the difference between both methods, I know that put is to assign a key/value pair, but replace? As it says the name will be to replace either the key or value, but I am not clear with both methods. I hope you can help me

I would like to know what is the actual function of strcopy from the string.h library and what does this C method do, I think that what is in one character set is copied to a pointer of another character set. But I would like to know what it does exactly and if it copies all memory addresses up to \0 , or all without considering \0

I have this simple code for a Header File and it gives me an error when defining this:

typedef char Cadena[N];

and my code is this:

 /* cadenas.h */


#ifndef CADENAS_H_
#define CADENAS_H_

#include <stdio.h>
#include <string.h>

#define N 129;

typedef enum{FALSO,CIERTO} Logico;
typedef char Cadena[N];

int buscaCaracter(const Cadena cad,char c);
Logico esPalindromo(const Cadena cad);


#endif /* CADENAS_H_ */

I am a beginner in C , and it is a fairly simple code but I don't know why when defining the type char it gives me a syntax error.

I have a big question and it is: What are pointers and what are they for? , since I have been learning Java at university, but now we are teaching the basics of C. But the pointers issue has not been clear to me.

I would like someone to clarify it for me, and with small examples if possible.

Thank you in advance and greetings!

I am working with Streams(Java 8) and when I use the method .stream() it is not clear to me the difference between .mapand .flatMap. What differences are there between these methods?

Hello, I would like to know what Mutable Types really are in Java, since it is not very clear to me sometimes when making classes. Cheers