// ==UserScript==
// @name         leetCode过滤器
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://leetcode-cn.com/problemset/all/
// @grant        none
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';
    let func = window.onload ;
    window.onload = ()=>{
        func && func();
        let observer = new MutationObserver((a,b)=>{
            Array.from(document.getElementsByTagName("tr"))
            .filter(item=>item.querySelectorAll("div>span>span").length>0)
            .forEach(item=>{item.style.display='none'});
        });
        let tb = document.querySelector(".category-group-base+div")
        let options = {
            'childList': true,
            "subtree":true,
        } ;
        observer.observe(tb, options);
    }
})();