Advent of code 2024 day 9 part 1 (7 ms)

def day9_part1(s):
  values = list(map(int, list(s.strip())))
  last_index = len(values) // 2
  checksum = position = index = i = 0

  while i < len(values):
    for _ in range(values[i]):
      checksum += position * index
      position += 1
    i += 1
    index += 1
    if i < len(values):
      for _ in range(values[i]):
        while i + 1 < len(values):
          if values[-1]:
            checksum += position * last_index
            position += 1
            values[-1] -= 1
            break
          values.pop(), values.pop()
          last_index -= 1
      i += 1

  return checksum