export function groupConsecutiveDuplicates(nums: number[]): number[][] {
  const result: number[][] = []

  for (const num of nums) {
    const lastSequence = result[result.length - 1]

    if (!lastSequence || num !== lastSequence[0]) {
      result.push([num])
    } else {
      lastSequence.push(num)
    }
  }

  return result;
}