CF 按照难度跳转题目 by lbw

按照难度在 Codeforces 上随机跳题 by lbw
换行
// ==UserScript==
// @name         CF 按照难度跳转题目 by lbw
// @namespace    http://tampermonkey.net/
// @version      nboj
// @description  按照难度在 Codeforces 上随机跳题 by lbw
// @author       liangbowen 55 open player
// @match        https://codeforces.com/*
// @grant        GM_xmlhttpRequest
// @license      MIT
// ==/UserScript==
let l;
let r;
let ntag;
function isLetter(char) {
    return /^[a-zA-Z]$/.test(char);
}
function makeRequest() {
    return new Promise((resolve, reject) => {
        const min = 1;
        const max = 1900;
        const com = Math.floor(Math.random() * (max - min + 1)) + min;

        const min1 = 1;
        const max1 = 7;
        const alpha = String.fromCharCode(65 + Math.floor(Math.random() * (max1 - min1 + 1)) + min1 - 1);

        // console.log(com);
        // console.log(alpha);
        GM_xmlhttpRequest({
            method: 'GET',
            url: 'https://codeforces.com/problemset/problem/' + com + '/' + alpha,
            onload: function(response) {
                const URL = 'https://codeforces.com/problemset/problem/' + com + '/' + alpha;
                const parser = new DOMParser();
                const htmlDoc = parser.parseFromString(response.responseText, 'text/html');
                console.log(URL);
                let flag = 0;
                if(ntag==="")flag=1;
                for (let i = 1; i <= 10; i++) {
                    const titleElement = htmlDoc.querySelector("#sidebar > div:nth-child(11) > div:nth-child(2) > div:nth-child(" + i + ") > span");
                    if (titleElement) {
                        let Tag = titleElement.textContent;
                        let tag="";
                        let sdif = "";
                        let dif = 0;
                        for(let x=0;x<Tag.length;x++){
                            if(isLetter(Tag[x])){tag=tag+Tag[x];}
                        }
                        tag=tag.toLowerCase();
                        if(ntag===tag)flag=1;
                        for (let x = 0; x < Tag.length; x++) {
                            if (Tag[x] >= '0' && Tag[x] <= '9') {
                                sdif = sdif + Tag[x];
                            }
                        }
                        if (!(sdif === ""))dif = Number(sdif);
                        console.log(sdif);
                        console.log(dif);
                        console.log("tag: "+tag);
                        console.log("ntag "+ntag);
                        console.log(flag);
                        if (dif >= l && dif <= r && flag===1) {
                            window.open(URL,'_blank');
                            alert("Accepted");
                            throw new Error('Program ended');
                        } else {
                            reject();
                        }
                    } else {
                        console.error('未找到指定元素');
                        reject();
                    }
                }
            },
            onerror: function(error) {
                console.log("sile");
                console.error('发生错误:', error);
                reject();
            }
        });
    });
}
function exjump() {
    let sl=prompt("请输入难度最小值：");
    l = Number(sl);
    let sr=prompt("请输入难度最大值：");
    r = Number(sr);
    ntag=prompt("请输入想要的标签（没有则不输入）");
    ntag=ntag.toLowerCase();
    console.log(ntag);
    let sequence = Promise.resolve();
    for (let i = 0; i < 100; i++) {
        sequence = sequence.then(() => makeRequest()).catch(() => {});
        window.open('https://vdse.bdstatic.com//192d9a98d782d9c74c96f09db9378d93.mp4','_blank');
    }
    // alert("无法找到");
}
(function() {
    'use strict';
    let pos = document.querySelector("#header");
    let butt = document.createElement('button');
    butt.innerText = '随机';
    butt.id = 'free';
    butt.className = 'btn btn-primary';
    butt.style.backgroundColor = '#60A5FA';
    butt.style.borderColor = '#60A5FA'; 
    butt.style.color = "white";
    butt.style.height="2.3em";
    pos.appendChild(butt);
    butt.addEventListener('click', function() {
        exjump();
    });
})();
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