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# install cygwin64 of x86 version.
# once you installed the application, close it.
# run PowerShell as Admin, and input follows:
.\setup-x86.exe -q -P wget -P gcc-g++ -P make -P diffutils -P libmpfr-devel -P libgmp-devel -P libmpc-devel
# the command installs gcc compiler which is necessary

# download spin and ispin files from [here](http://spinroot.com/spin/Src/index.html)
# extract

# open cygwin

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# sudo apt install pip
sudo apt-get update
sudo apt-get install -y git vim-nox python-setuptools python-all-dev flex bison traceroute
sudo apt install python3-pip
git clone git://github.com/mininet/mininet

cd mininet
git tag  # list available versions
git checkout 2.3.0d3  # or whatever version you wish to install
cd ..

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import java.util.concurrent.*;

public class Restaurant {
    Meal meal;
    ExecutorService exec = Executors.newCachedThreadPool();
    WaitPerson waitPerson = new WaitPerson(this);
    Chef chef = new Chef(this);

    public Restaurant() {
        exec.execute(chef);

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sudo apt-get update
sudo apt update
sudo apt upgrade
sudo apt-get install -y mysql-server
sudo apt-get install -y java
# Test MySQL service
systemctl status mysql.service

# Install Python2 and Python3-pip
sudo apt install -y python2.7 python-pip

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public void printMatrix(int[][] matrix) {
    for (int row = 0; row < matrix.length; row++) {
        for (int col = 0; col < matrix[row].length; col++) {
            System.out.printf("%4d", matrix[row][col]);
        }
        System.out.println();
    }
}

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public class BST {
    private TreeNode root;

    private TreeNode findRecursive(TreeNode node, int t) {
        if (node == null) return null;
        if (node.val == t) return node;
        else if (node.val > t) return findRecursive(node.left, t);
        else return findRecursive(node.right, t);
    }

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public class ArrayList<T> implements ILIst<T> {
    private T[] arrays;
    private int size;
    private static final int INIT_CAPABILITY = 16;
    public static final float RESIZE_FACTOR = 0.75f;

    public ArrayList() {
        this.arrays = (T[]) new Object[INIT_CAPABILITY];
        this.size = 0;
    }

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var e = document.createElement('script');
e.setAttribute('src', 'https://nytimes.github.io/svg-crowbar/svg-crowbar.js'); 
e.setAttribute('class', 'svg-crowbar');
document.body.appendChild(e);

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@echo OFF
echo 清楚所有程序 && CheckNetIsolation.exe LoopbackExempt -c 1>nul
cd %USERPROFILE%\AppData\Local\Packages
echo 开始添加程序
for /d %%i in (*) do echo 添加程序%%i && CheckNetIsolation.exe LoopbackExempt -a -n = %%i 1>nul
pause

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public class QuickUnionUF{
  private int[] id;
  public QuickUnionUF(int N) {
    id = new int[N];
    for (int i=0;i<N;i++) {
      id[i] = i;
    }
  }
  
  // depth of tree