小编Jam*_*s Z的帖子

与其他数据结构相比,二进制索引树具有非常少或相对没有理论可供研究.顶级编码器教程是唯一能够简洁教授它的地方.虽然教程在所有解释中都是完整的,但我无法理解这种树背后的直觉是什么？以及如何证明它的正确性？

我认为证明是复杂的解释.那么在使用BIT时,您遵循什么方法？

C:\Users\lg\Desktop> npm uninstall -g create-react-app

up to date, audited 1 package in 216ms

found 0 vulnerabilities

C:\Users\lg\Desktop>npx clear-npx-cache
Need to install the following packages:
  clear-npx-cache
Ok to proceed? (y) y

C:\Users\lg\Desktop>npx create-react-app@5.0.0 reduxapp
Need to install the following packages:
  create-react-app@5.0.0
Ok to proceed? (y) y
npm WARN deprecated tar@2.2.2: This version of tar is no longer supported, and will not receive security updates. Please upgrade asap.

You are running `create-react-app` 4.0.3, which is behind the latest release (5.0.0).

We no …

当我导航到 Laravel 项目的管理员登录页面时，我不明白为什么会出现上述错误。Laravel 版本是 7x。我怎样才能解决这个问题？

<?php

namespace App\Http\Controllers\Admin;

use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\AuthenticatesUsers;


class LoginController extends Controller
{
    use AuthenticatesUsers;

    /**
     * Where to redirect admins after login.
     *
     * @var string
     */
    protected $redirectTo = '/admin';

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest:admin')->except('logout');
    }

    /**
     * @return \Illuminate\Contracts\View\Factory|\Illuminate\View\View
     */
    public function showLoginForm()
    {
        return view('admin.auth.login');
    }
}

我正在尝试使用以下命令启动 docker 容器。

docker run -it -p 50070:50070 -p 8088:8088 -p 8080:8080 suhothayan/hadoop-spark-pig-hive:2.9.2 bash

它最终出现了以下错误。

docker：来自守护进程的错误响应：端口不可用：listen tcp 0.0.0.0/50070：bind：尝试以访问权限禁止的方式访问套接字。

据我了解，由于另一个进程使用了​​端口 50070，因此发生了错误。我试图识别该进程，以便在命令提示符下使用以下命令终止该进程，但它既没有给出输出也没有给出错误。

netstat -ano | findstr :50080

我正准备添加谷歌地图活动,我的android工作室显示此错误

错误:错误:第(25)行无法为org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler类型的对象获取未知属性'compile'.

 <a href="openFi`here`le:C:\Users\dhami\Desktop\uber1\ParseStarterProject\build.gradle"></a>

这是我的解析项目Gradle文件

apply plugin: 'com.android.application'android {                                                                              compileSdkVersion rootProject.ext.compileSdkVersion
buildToolsVersion rootProject.ext.buildToolsVersion

defaultConfig {
    applicationId "com.parse.starter"
    minSdkVersion rootProject.ext.minSdkVersion
    targetSdkVersion rootProject.ext.targetSdkVersion
    versionCode 1
    versionName "1.0"
}

buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}

dependencies {
    compile 'com.android.support:appcompat-v7:23.4.0'
    compile 'com.parse.bolts:bolts-tasks:1.3.0'
    compile 'com.parse:parse-android:1.13.0'
    compile 'com.google.android.gms``:play-services:9.2.1'
}

这是我的项目gradle文件

buildscript {
repositories {
    mavenCentral()
}
dependencies {
    classpath 'com.android.tools.build:gradle:2.1.3'
}}allprojects {
repositories {
    mavenCentral()
}  } ext {
compileSdkVersion = 23
buildToolsVersion = "23.0.1"
minSdkVersion = 14
targetSdkVersion = 23 …

我在安装android studio的最新预览版后再次尝试构建我的项目,但是在更新gradle版本时会出现以下异常:

org.gradle.api.UncheckedIOException: Failed to capture snapshot of input files for task ':app:mergeDebugResources' property 'aapt2FromMaven' during up-to-date check.
at org.gradle.api.internal.changedetection.state.CacheBackedTaskHistoryRepository.snapshotTaskFiles(CacheBackedTaskHistoryRepository.java:331)
at org.gradle.api.internal.changedetection.state.CacheBackedTaskHistoryRepository.createExecution(CacheBackedTaskHistoryRepository.java:151)
at org.gradle.api.internal.changedetection.state.CacheBackedTaskHistoryRepository.access$100(CacheBackedTaskHistoryRepository.java:61)
at org.gradle.api.internal.changedetection.state.CacheBackedTaskHistoryRepository$1.getCurrentExecution(CacheBackedTaskHistoryRepository.java:111)
at org.gradle.api.internal.changedetection.changes.DefaultTaskArtifactStateRepository$TaskArtifactStateImpl.getStates(DefaultTaskArtifactStateRepository.java:208)
at org.gradle.api.internal.changedetection.changes.DefaultTaskArtifactStateRepository$TaskArtifactStateImpl.isUpToDate(DefaultTaskArtifactStateRepository.java:93)
at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:50)
at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:54)
at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:59)
at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:101)
at org.gradle.api.internal.tasks.execution.FinalizeInputFilePropertiesTaskExecuter.execute(FinalizeInputFilePropertiesTaskExecuter.java:44)
at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:91)
at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:62)
at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:59)
at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:54)
at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:34)
at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker$1.run(DefaultTaskGraphExecuter.java:256)
at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336)
at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328)
at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199)
at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110)
at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:249)
at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:238)
at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.processTask(DefaultTaskPlanExecutor.java:123)
at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.access$200(DefaultTaskPlanExecutor.java:79)
at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:104)
at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:98)
at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.execute(DefaultTaskExecutionPlan.java:663)
at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.executeWithTask(DefaultTaskExecutionPlan.java:597)
at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.run(DefaultTaskPlanExecutor.java:98) …

我正在使用 Kotlin，现在 android studio 建议我添加

这是一个微妙的 API，使用时需要小心。确保您完全阅读并理解标记为敏感 API 的声明文档。

当我点击

add @DelicateCoroutinesApi annotation to function

它添加了 @DelicateCoroutinesApi 这样的东西

@DelicateCoroutinesApi
fun getAmount(activity: LoginActivity, user:FirebaseUser){
      mFireStore.collection(Constants.AMOUNT).document(user.uid).get().
            addOnSuccessListener { d ->
                 activity.amountGetSuccess( d, user)
            }
 }

当我使用协程时，它建议我看另一个例子

@DelicateCoroutinesApi
 private fun playsound() {

   GlobalScope.launch {
        withTimeout(10L) {
            // play sound
   val  mPlayerPress = MediaPlayer.create(this, R.raw.button_press)
            mPlayerPress.start()
        }
    }

我的问题是为什么这个@DelicateCoroutinesApi @DelicateCoroutinesApi 的工作是什么

码:

let names= ["Style","List","Raw"];
let results= names.find(x=> x.includes("s");
console.log(results); // 

如何从数组名称中获取包含"s"的名称,目前,我只得到一个元素,但我需要所有出现.

材料图标在我的项目中无法正确呈现,我安装正确,但即使没有在浏览器中显示.

我按照以下步骤:

npm install material-design-icons

.angular-cli.json

"styles": [
        "styles.css",
        "../node_modules/material-design-icons/iconfont/material-icons.css"
      ],

app.module.ts

import {MatSidenavModule, MatToolbarModule, MatIconModule} from '@angular/material';

app.component.html

<mat-toolbar-row>
    <span>Second Line</span>
    <span class="example-spacer"></span>
    <mat-icon class="example-icon">verified_user</mat-icon>
  </mat-toolbar-row>

在 PYCHARM 上运行 pyspark 程序时出现以下错误，错误：

java.io.IOException: 无法运行程序“python3”: CreateProcess error=2, 系统找不到指定的文件......

解释器正在识别 python.exe 文件，并且我已在项目结构中添加了内容根目录。

我之前在 Windows 命令提示符下运行相同的程序时遇到了类似的问题，并使用What is the right way to edit spark-env.sh before running Spark-shell?解决了它。