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"""
Complete st.session_state Tutorial App
This app demonstrates ALL use cases of st.session_state with interactive examples.
"""

import streamlit as st
import pandas as pd
from datetime import datetime, timedelta
import random

# ============================================================================
# PAGE CONFIGURATION
# ============================================================================
st.set_page_config(
    page_title="Session State Tutorial",
    page_icon="

/**
 * Definition for a binary tree node.
 * function TreeNode(val, left, right) {
 *     this.val = (val===undefined ? 0 : val)
 *     this.left = (left===undefined ? null : left)
 *     this.right = (right===undefined ? null : right)
 * }
 */
/**
 * @param {TreeNode} root
 * @return {number}
 */
var maxLevelSum = function(root) {
    // Edge case: if the tree is empty (not typical for this problem)
    if (!root) return 0;

    // Queue for BFS - start with the root
    const queue = [root]

 

# Option 1: Modern Vibrant Gradient (Sunset Orange to Pink)
st.markdown("""
<div style='
    background: linear-gradient(135deg, #FF6B6B 0%, #FF8E53 50%, #FFA07A 100%);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 8px 20px rgba(255, 107, 107, 0.4);
    text-align: center;
    margin-bottom: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
'>
    <h2 style='
        color: white;
        font-weight: bold;
        margin: 0;
        font-size: 28px;
        l

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/swiper/swiper-bundle.min.css" />

<!-- Carousel -->
<div class="swiper looping-words">
  <div class="swiper-wrapper">
    <div class="swiper-slide">Get noticed fast</div>
    <div class="swiper-slide">Win more leads</div>
    <div class="swiper-slide">Sell with ease</div>
    <div class="swiper-slide">Build real trust</div>
    <div class="swiper-slide">Grow every day</div>
  </div>
</div>

<!-- Swiper Scripts -->
<script sr

services:
  postgres:
    image: postgres:16-alpine
    container_name: n8n-postgress
    restart: unless-stopped
    environment:
      - POSTGRES_USER=${POSTGRES_USER}
      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
      - POSTGRES_DB=${POSTGRES_DB}
    volumes:
      - ./postgres_data:/var/lib/postgresql/data

  n8n:
    image: n8nio/n8n:latest
    container_name: n8n
    restart: unless-stopped
    environment:
      - DB_TYPE=postgresdb
      - DB_POSTGRESDB_DATABASE=${POSTGRES_DB}
      - 

package main

import "fmt"

func main() {
	fruits := [4]string{"Apple", "Banana", "Orange", "Grapes"}
	fmt.Println("Fruits array:", fruits)
}

// import fmt #format package
// fmt.Println

package main

import "fmt"

func main() {
	var numbers [5]int
	fmt.Println("Default values in an integer array:", numbers)
}

/*
https://jsbin.com/setohiqiwe/edit?html,css,output
*/

:root {
	--color: red;
}

.a, .b, .c {
	margin: 1rem;
	padding: 0.55rem;
}


.a {
	background: hsl(from var(--color) h s 90%);
}

.b {
	background: hsl(from var(--color) h s calc(l + 40));
}

.c {
	background: hsl(from var(--color) h s l / 0.2);
}




/*

Converted to HSL, red is hsl(0 100% 50%), thus:

Setting l to 90%,
Is just hsl(0 100% 90%).

Adding 40 to l,
Add the l components together:
hsl(0 100% (50% + 40%)) → hsl(0 100% 90%)

Chan

function Get-IniContent ($filePath) {
    $ini = @{}
    switch -regex -file $FilePath {
        "^\[(.+)\]" {
            # Section
            $section = $matches[1]
            $ini[$section] = @{}
            $CommentCount = 0
        }
        "^(;.*)$" {
            # Comment
            $CommentCount++
            $name = "Comment$($CommentCount)"
            $value = $matches[1]
            $ini[$section][$name] = $value
        }
        "(.+?)\s*=(.*)" {
            # 

aaaa

all:

const loadingScreen = document.querySelector('.loading-screen');

if (loadingScreen) {
  const CONFIG = {
    fadeThreshold: 150,
    bufferZone: 50,
    reactivateAt: 5,
    wheelMultiplier: 0.8,
    touchMultiplier: 1.5,
    extraVirtualCap: 100
  };

  const UNLOCK_THRESHOLD = CONFIG.fadeThreshold + CONFIG.bufferZone;
  const MAX_VIRTUAL = UNLOCK_THRESHOLD + CONFIG.extraVirtualCap;

  const state = {
    ticking: false,
    virtualY: 0,
    locked: false,
    savedScrollY: 0,
    hasLeftTop: 

realpath file.txt

# realpath is part of GNU coreutils

# Installed by default on most Linux distributions

/**
 * @param {number[]} nums
 * @return {number}
 */
var sumFourDivisors = function(nums) {
    // Helper: return the sum of divisors of n if it has exactly 4 divisors.
    // Otherwise return 0.
    function sumIfFourDivisors(n) {
        let count = 0; // how many divisors we've found
        let sum = 0;   // sum of those divisors

        // Check all possible divisors from 1 up to sqrt(n)
        for (let d = 1; d * d <= n; d++) {
            if (n % d === 0) {
                let other = 

<p class="text">テキスト</p>

# メール認証技術（SPF・DKIM・DMARC）学習メモ

---

## 1. SPF（Sender Policy Framework）

### 概要

- 「このドメインからのメールは、これらのIPアドレスから送信される」とDNSで宣言する仕組み
- 受信サーバーが送信元IPをSPFレコードと照合し、正当性を検証する

### なぜ必要か

- SMTPプロトコルは送信元アドレスを検証する仕組みを持たない
- 任意のサーバーから任意の送信元アドレスでメール送信が可能
- SPFにより、ドメイン所有者が「正当な送信元IP」を定義できる

### 設定場所

- ドメインのDNS TXTレコード

### レコード例

```
example.com. IN TXT "v=spf1 ip4:203.0.113.1 include:_spf.google.com -all"
```

| 部分 | 意味 |
|------|------|
| `v=spf1` | SPFバージョン1 |
| `ip4:203.0.113.1` | このIPからの送信を許可 |
| `include: