cleanTheRoom

function cleanTheRoom(arr) {
  // sort the array in ascending order
  arr.sort((a, b) => a - b);
  // initialize an empty array to store the result
  let result = [];
  // initialize a variable to store the current element
  let current = null;
  // initialize a variable to store the count of the current element
  let count = 0;
  // loop through the array
  for (let num of arr) {
    // if the current element is null or different from the num
    if (current === null || current !== num) {
      // if the count is more than one, push an array of the current element and count to the result
      if (count > 1) {
        result.push(Array(count).fill(current));
      }
      // else if the count is one, push the current element to the result
      else if (count === 1) {
        result.push(current);
      }
      // update the current element and count
      current = num;
      count = 1;
    }
    // else if the current element is equal to the num, increment the count
    else {
      count++;
    }
  }
  // handle the last element and count
  if (count > 1) {
    result.push(Array(count).fill(current));
  } else if (count === 1) {
    result.push(current);
  }
  // return the result
  return result;
}