function solve() {
  return function (selector, count) {
    if(typeof selector === 'undefined' || selector === null || typeof selector !== 'string'){
      throw Error('Invalid or missing selector!');
    }

    if (isNaN(count) || count < 1) {
      throw Error('Count is not a valid number!');
    }

    var $ul = $('<ul />').addClass('items-list');
    var $selected = $(selector);

    if ($selected.length !== 0) {
      for (var i = 0; i < count; i += 1) {
        var $li = $('<li>')
        .addClass('list-item')
        .text('List item #' + i)
        .appendTo($ul);
      }

      $selected.append($ul);
    }
  };
}