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# 用切片避免数组或字符越界
```
# s长度大于0则返回第一个字符，否则返回空字符串""
s = ""
first_ch = s[:1]

# s长度大于0则返回倒数第一个字符，否则返回空字符串""
end_ch = s[-1:]

## 数组同理
```

# 用`>>>`表示此行是代码
```
"""Return (exitcode, output) of executing cmd in a shell.

    Execute the string 'cmd' in a shell with 'check_output' and
    return a 2-tuple (status, output). The locale encoding is used
    to decode the output and process newlines.

    A trailing newline is stripped from the output.
    The exit status for the command can be interpreted
    according to the rules for the function 'wait'. Example:

    >>> import subprocess
    >>> subprocess.getstatusoutput('ls /bin/ls'

# 表示成功
- ✅
- ✔️
- 🍦
- 🍧
- 🍺
- 🎉

# 表示错误
- ❗

# 提示、小贴士
- 💡
- 🔔
# 表示警告
- ⚠️

# 运行、启动
- 🛩️
- 🚀
- ✈️

#添加`-u`参数
```
python -u main.py
```

/**
 * @param {number[]} nums
 * @param {number} maxOperations
 * @return {number}
 */
var minimumSize = function(nums, maxOperations) {
    // Helper function to determine if a given max_bag_size can be achieved with the allowed operations
    function canAchieve(max_bag_size) {
        let operations = 0;
        for (let balls of nums) {
            if (balls > max_bag_size) {
                // Calculate the number of splits needed for the current bag
                operations += Math.floor

# win10 输入`wsl`报错：不支持该请求

# 解决：
- `控制面板` -> `程序和功能` -> `启用或关闭Windows功能` 勾选`虚拟机平台`和`适用于Linux的Windows子系统`

## Github Actions报错：remote: Permission to nomeqc/naiveproxy-server-build.git denied to github-actions[bot].
- **解决：**
在仓库首页：
 `Settings` -> `Actions` -> `General` -> `Workflow permissions` -> 
`Read and write permissions`

#modules
Import-module "${env:ProgramFiles}\Microsoft Dynamics NAV\90\Service\NavAdminTool.ps1”


#global vars
$username = 'user1'
$PartnerLicense = 'C:\Temp\BC14DEV.flf'
$ServerInstance = 'BC140_CIF'
$ExtName = 'CIF - BC14 Temp Extension'

#Kick out users
#Stop Job Queues
#Disable CRM
#Create a Backup
#Restose Database
#Map user to Database
#Setup Serice Tier
#Add User to Database SQL 
#if the finsql gives driver error on temp server, install 
https://www.microsoft.com/en-US/

https://linuxconfig.org/how-to-check-disk-usage-by-folder-on-linux

/**
 * @param {number[]} banned
 * @param {number} n
 * @param {number} maxSum
 * @return {number}
 */
var maxCount = function(banned, n, maxSum) {
    // Convert banned array to a set for O(1) lookups
    const bannedSet = new Set(banned);
    let currentSum = 0; // Initialize the sum of chosen integers
    let count = 0; // Initialize the count of chosen integers

    // Iterate through integers from 1 to n
    for (let i = 1; i <= n; i++) {
        // Skip if the integer is in the banned set

/**
 * Выполнять колбэк только по прошествии указанного времени (с момента последнего вызова)
 *
 * @param func
 * @param delay
 *
 * @returns
 */
function debounce(func, delay) {
	let timeout;
	return function (...args) {
		clearTimeout(timeout);
		timeout = setTimeout(() => {
			func.apply(this, args);
		}, delay);
	};
}

const handleInput = debounce(() => {
	console.log('Функция вызвана после задержки');
}, 300);

document.querySelector('input').addEventListener('input', handleInput);

<?php
//  TransportListResolver
class {
    public function getList(Order\Order $order, ?\Closure $transportListResolverModifier = null): array {
  .
  .
  .
  
    if ($transportListResolverModifier) {
    	$transportListResolverModifier($transportListResolver);
    }
  .
  .
  .
  
  }
}


// usage in another class
// we can modify object via closure
$transportList = $this->transportListResolver->getList($order, function (TransportEshopOrderSelectionResolver $transportListResolver) {
			$trans

public static class DocumentLanguageValidator
    {
        // Language validation regexes
        private static readonly string[] RestrictedLanguagePatterns = new string[]
        {
            // Arabic (Includes Persian and Urdu)
            @"[\u0600-\u06FF\u0750-\u077F]", // Arabic Script and Supplement

            // Chinese (Unified Han Characters)
            @"[\u4E00-\u9FFF]", // Mandarin and Cantonese

            // Tagalog (Philippines)
            @"[\u1700-\u171F]", 

<?php
//
// Do NOT USE OPENING <?php TAG IN ALFRED APP
//

/**
 * Open 1 or more (comma or new line separated) IP Addresses from selection.
 *
 * @link https://github.com/cliffordp/alfred-app-workflows Download this Alfred App Workflow's code (and more).
 * @link https://gist.github.com/cliffordp/ This Alfred App Workflow's code snippet.
 */

// CHANGE THIS if you want it to work for a different site.
$url_base = 'https://dnschecker.org/ip-location.php?ip=';

// turn New Lines into commas
$query