CF Random Current Page

cf_get_random.js

// ==UserScript==
// @name         Codeforces Get Random
// @namespace    https://github.com/KNN-07
// @version      1.0
// @description  try to take over the world!
// @author       KNN-07 / normankr07
// @match        https://*.codeforces.com/problemset*
// @icon         data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    let list = document.querySelector(".problems").querySelectorAll("tr:not(.accepted-problem)");
    let size = list.length;
    let ranbtn = document.createElement("button");
    ranbtn.innerHTML = "Get Random";
    ranbtn.onclick = function () {
//         let params = `scrollbars=no,resizable=no,status=no,location=no,toolbar=no,menubar=no,
// width=0,height=0,left=-1000,top=-1000`;
//         window.open(url, '_blank', params).focus();
        let id = Math.floor(Math.random() * (size + 1));
        let base = list[id].querySelector("a").getAttribute("href");
        let url = 'https://codeforces.com' + base;
        window.open(url, '_blank').focus();
    };
    document.querySelector("._FilterByTagsFrame_main").children[2].appendChild(ranbtn);
})();