code: def get_indices(integers):
      
      indices = AccumDict(accum=[])  # idx -> [(start, stop), ...]
      start = 0
      for i, vals in itertools.groupby(integers):
          n = sum(1 for val in vals)
          indices[i].append((start, start + n))
          start += n
      return indices
docs: :param integers: a sequence of integers (with repetitions)
      :returns: a dict integer -> [(start, stop), ...]
  
      >>> get_indices([0, 0, 3, 3, 3, 2, 2, 0])
      {0: [(0, 2), (7, 8)], 3: [(2, 5)], 2: [(5, 7)]}