小编sab*_*yan的帖子

在Android Studio中创建新项目后,我在项目中添加了Firebase和Firebase消息,如手册中所述.

但是,在Gradle同步后,IDE会显示错误:
All com.android.support libraries must use the exact same version specification (mixing versions can lead to runtime crashes). Found versions 28.0.0-beta01, 26.1.0. Examples include com.android.support:animated-vector-drawable:28.0.0-beta01 and com.android.support:support-media-compat:26.1.0

没有Firebase库,项目就可以正确构建.

项目级别build.gradle:

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    ext.kotlin_version = '1.2.30'
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.3'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual …

我写了一个简单的C ++程序，代码如下：

// ??????? 72, ?????? 2.18
#include <iostream>

#define lint long long int

using std::cin;
using std::cout;

void input(lint arr[], lint arrLen) {
    for (lint i = 0; i < arrLen; ++i) {
        cout << "arr[" << i << "] = ";
        cin >> arr[i];
    }
}

void output(lint arr[], lint arrLen) {
    for (lint i = 0; i < arrLen; ++i) {
        cout << "newArr[" << i << "] = " << arr[i] << '\n';
    }
}

bool …