In order to filter locked questions in Leetcode, install Custom Blocker chrome extention and import rule below.

leetcode_filter_locked

[{"words":[{"word_id":17,"rule_id":1,"word":".*","is_regexp":true,"is_complete_matching":false,"is_case_sensitive":false,"is_include_href":false,"insert_date":1509556290460,"update_date":1509556290460,"delete_date":0}],"search_block_by_css":false,"hide_block_by_css":false,"rule_id":1,"title":"Problems - LeetCode","is_disabled":false,"site_regexp":"https://leetcode.com/problemset/*","example_url":"https://leetcode.com/problemset/all/?difficulty=Medium&status=Todo","site_description":"Problems - LeetCode","specify_url_by_regexp":true,"search_block_xpath":"//TR//DIV//SPAN","search_block_css":"TR I","search_block_description":"","hide_block_xpath":"//TBODY[@class=\"reactable-data\"]//TR","hide_block_css":"","hide_block_description":"","user_identifier":"164e7d1a-d68d-4d38-b51a-394eddaa6adc","global_identifier":"5a544c54-df76-492c-9d58-785d4927ac5f","block_anyway":false,"insert_date":1509551105336,"update_date":1509556446509,"delete_date":0}]

leetcode_filter_locked.txt

// In order to filter locked questions in Leetcode, install Custom Blocker chrome extention and import rule below.
// https://chrome.google.com/webstore/detail/customblocker/elnfhbjabfcepfnaeoehffgmifcfjlha

tampermonkey_script.txt

// ==UserScript==
// @name         leetcode hide locked problems
// @description Hide Locked Problems on Leetcode
// @version      0.1
// @author       akdeniz
// @require      https://gist.github.com/raw/2625891/waitForKeyElements.js
// @match        https://leetcode.com/*
// ==/UserScript==


(function() {
    'use strict';
    observeDomChange();
})();

function observeDomChange() {
    var MutationObserver = window.MutationObserver;
    var myObserver       = new MutationObserver (remove_locked_questions);
    var obsConfig        = {
        childList: true, attributes: true,
        subtree: true,   attributeFilter: ['list-group']
    };
    myObserver.observe (document, obsConfig);
    function remove_locked_questions () {
        var $locked_question_rows = $("tbody.reactable-data").find("tr").filter(
            function(){
                return $(this).find('i.fa-lock').length > 0;
            });
        for (var i = 0; i < $locked_question_rows.length; i++) {
            try{
                $locked_question_rows[i].remove();
            }catch(err)
            {
            }
        }
    }
}