Add a button to redirect from AtCoder problems to Luogu
// ==UserScript==
// @name AtCoder to Luogu Redirect Button
// @namespace http://tampermonkey.net/
// @version 1.2
// @description Add a button to redirect from AtCoder problems to Luogu
// @author ChatGPT (prompted by PsychoPinkQ)
// @match https://atcoder.jp/contests/*/tasks/*
// @grant GM_xmlhttpRequest
// @connect luogu.com.cn
// @license MIT
// ==/UserScript==
(function() {
'use strict';
// 取得目前 AtCoder 題目 URL 的最後部分 (例如 abc328_g)
const path = window.location.pathname;
const match = path.match(/contests\/(.*?)\/tasks\/(.*)/);
if (!match) return;
const contest = match[1];
const task = match[2];
const luoguURL = `https://www.luogu.com.cn/problem/AT_${task}`;
// 創建按鈕樣式
const button = document.createElement("button");
button.style.position = "fixed";
button.style.bottom = "60px"; // 將按鈕位置向上調整
button.style.left = "20px";
button.style.padding = "5px 10px"; // 調整按鈕大小
button.style.backgroundColor = "rgba(173, 216, 230, 0.7)"; // 淺藍色
button.style.color = "black";
button.style.border = "none";
button.style.borderRadius = "5px";
button.style.fontSize = "12px"; // 縮小字體
button.style.cursor = "pointer";
button.style.zIndex = "1000";
button.textContent = "查看对应 Luogu 题目";
// 檢查 Luogu 題目是否存在
GM_xmlhttpRequest({
method: "GET",
url: luoguURL,
onload: function(response) {
// 判斷頁面標題是否包含「錯誤」
const parser = new DOMParser();
const doc = parser.parseFromString(response.responseText, "text/html");
const title = doc.querySelector("title").innerText;
if (title.includes("错")) {
// 題目不存在，將按鈕變為淺紅色
button.style.backgroundColor = "rgba(240, 128, 128, 0.7)"; // 淺紅色
button.textContent = "Luogu 似乎尚未有此题目";
button.disabled = true;
} else {
// 題目存在，設置點擊事件
button.onclick = function() {
window.open(luoguURL, "_blank");
};
}
},
onerror: function() {
button.style.backgroundColor = "rgba(240, 128, 128, 0.7)"; // 請求錯誤也設置為淺紅色
button.textContent = "发生异常";
button.disabled = true;
}
});
// 將按鈕加入頁面
document.body.appendChild(button);
})();