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sk-lm-oAmPj8OQ:ZnwH51IwH6oD64IrpVZ52839. Check if Strings Can be Made Equal With Operations I
You are given two strings s1 and s2, both of length 4, consisting of lowercase English letters.
You can apply the following operation on any of the two strings any number of times:
Choose any two indices i and j such that j - i = 2, then swap the two characters at those indices in the string.
Return true if you can make the strings s1 and s2 equal, and false otherwise.
/**
* @param {string} s1
* @param {string} s2
* @return {boolean}
*/
var canBeEqual = function(s1, s2) {
// --- Core idea ---
// We are only allowed to swap:
// - index 0 ↔ 2 (even positions)
// - index 1 ↔ 3 (odd positions)
//
// This means characters can move *within* their parity group (even/odd),
// but never cross between them.
//
// So the strings can be made equal if:
// 1. The even-index characters match as a multiset
// 2. The skills
1custom router
import { useState } from 'react'
import { useKV } from '@github/spark/hooks'
import { KnowledgeItem, ChatMessage } from './lib/types'
import { useTheme } from './hooks/use-theme'
import { Sidebar } from './components/Sidebar'
import { Dashboard } from './components/Dashboard'
import { Search } from './components/Search'
import { Upload } from './components/Upload'
import { Chat } from './components/Chat'
import { Scraper } from './components/Scraper'
import { Analytics } from './components/Analydev knowlege hub
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2573. Find the String with LCP
We define the lcp matrix of any 0-indexed string word of n lowercase English letters as an n x n grid such that:
lcp[i][j] is equal to the length of the longest common prefix between the substrings word[i,n-1] and word[j,n-1].
Given an n x n matrix lcp, return the alphabetically smallest string word that corresponds to lcp. If there is no such string, return an empty string.
A string a is lexicographically smaller than a string b (of the same length) if in the first position where a and b differ, string a has a letter that appears earlier in the alphabet than the corresponding letter in b. For example, "aabd" is lexicographically smaller than "aaca" because the first position they differ is at the third letter, and 'b' comes before 'c'.
/**
* @param {number[][]} lcp
* @return {string}
*/
var findTheString = function(lcp) {
const n = lcp.length;
// -----------------------------
// 1. Validate the diagonal
// -----------------------------
// lcp[i][i] must equal the length of the suffix starting at i.
for (let i = 0; i < n; i++) {
if (lcp[i][i] !== n - i) {
return ""; // impossible
}
}
// -----------------------------
// 2. Union-Find to group equal positions
AWS DDoS コスト爆発防止策
# AWS DDoS コスト爆発防止策まとめ
**出典：** [DDoS攻撃でAWS請求が200万円に！S3・CloudFrontで絶対やるべきコスト爆発防止策 6選 - Qiita](https://qiita.com/miruky/items/b996e374c91923141178)
---
## 事例
2026年3月、個人開発者のS3バケットがDDoS攻撃を受け、3日間で160TBのデータ転送が発生し約$15,000（約200万円）の請求が発生。
## なぜ高額になるか
S3はデフォルトでレート制限がなく、パブリックバケットへは事実上無制限にGETリクエストを送れる。160TB転送時のデータ転送料金は約$14,140（東京リージョン）。
| データ転送量 | 単価 |
|---|---|
| 〜10TB | $0.114/GB |
| 10TB〜50TB | $0.089/GB |
| 50TB〜150TB | $0.086/GB |
| 150TB超 | $0.084/GB |
---
## 防止策（優先度順）
| 優先度 | 対策 | コスト |
|--cssでデータ属性の値をcalcやCSSプロパティの値に使用する
<p class="badge" data-size="1.6" data-color="orange">文字</p>多言語対応実施時のhead追記事項(SEO)
<head>
<!-- 日本語版ページの場合 -->
<link rel="alternate" hreflang="ja" href="https://example.com/ja/page" />
<link rel="alternate" hreflang="en" href="https://example.com/en/page" />
<link rel="alternate" hreflang="zh" href="https://example.com/zh/page" />
<!-- フォールバック（言語が一致しない場合のデフォルト） -->
<link rel="alternate" hreflang="x-default" href="https://example.com/" />
</head>無限スクロールなどでcanvasを大量に描画する場合のメモリ管理
<div class="grid" id="grid"></div>.css
.grid {
display: flex;
flex-wrap: wrap;
gap: 1rem;
max-width: 960px;
margin: 2rem auto;
padding: 0 1rem;
}
.item {
width: calc((100% - 2rem) / 3);
aspect-ratio: 16 / 9;
background: #ddd;
}