new_contents: def get_water(arr: list[int]) -> int:
      size = len(arr)
      res: int = 0
      lmax: list[int] = arr[:]
      rmax: list[int] = arr[:]
      for i in range(1, size, 1):
          lmax[i] = max(arr[i], lmax[i-1])
      for i in range(size-2, -1, -1):
          rmax[i] = max(arr[i], rmax[i+1])
      for i in range(size):
          res += (min(lmax[i], rmax[i]) - arr[i])
  
      print(f"The maximum amount of water that can be trapped is {res}")
  
  def main() -> None:
      size = int(input("Enter the size of the bars: "))
  
      arr: list[int] = []
      print("Enter values for the bars:")
      for i in range(size):
          arr.append(int(input()))
  
      get_water(arr)
  
  main()
  
subject: add solution for trapping rain water problems in python