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// ==UserScript==
// @name         Codeforces Tag Hiding
// @namespace    http://t...content-available-to-author-only...y.net/
// @version      0.1
// @description  Hides tags on Codeforces, except difficulty. Enable tags in settings first.
// @author       Black.n.White
// @match        https://c...content-available-to-author-only...s.com/contest/*/problem/*
// @match        https://c...content-available-to-author-only...s.com/problemset/problem/*/*
// @grant        none
// ==/UserScript==
 
(function() {
    'use strict';
 
    var tagList = document.getElementsByClassName("tag-box");
    for(var i = 0; i < tagList.length; i++){
        if(tagList[i].title != "Difficulty"){
            tagList[i].parentElement.style.display = "none";
        }
    }
})();

prog.cpp:13:5: warning: character constant too long for its type
     'use strict';
     ^~~~~~~~~~~~
prog.cpp:12:12: error: expected ‘)’ before ‘{’ token
 (function() {
 ~          ^~
            )
prog.cpp:21:2: error: expected unqualified-id before ‘)’ token
 })();
  ^

Standard output is empty