hackerrank.user.js

// ==UserScript==
// @name         HackerRank Copy/Paste
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Allow copy/paste on HackerRank
// @author       Rinoc Johnson
// @include      https://www.hackerrank.com/tests/*
// @grant        none
// ==/UserScript==
/* jshint -W097 */
'use strict';
var docEvents = $(document).data('events'),
targetEvents = [
  'contextmenu',
  'cut',
  'copy',
  'paste'
];
Object.observe(docEvents, function (changes) {
  changes.forEach(function (change) {
    if (targetEvents.indexOf(change.name) != - 1 && change.type == 'add') {
      $(document).off(change.name);
    }
  });
});