export function groupConsecutiveDuplicates(nums: number[]): number[][] {
  if (nums.length === 0) return [];
  const answer = [];
  const temp = [];
  for (let i = 0; i < nums.length; i++) {
    const current = nums[i];
    if (!temp.includes(current) && temp.length > 0) {
      answer.push([...temp]);
      temp.length = 0;
    }
    temp.push(current);
  }
  if (temp.length > 0) answer.push(temp);
  return answer;
}