new_contents: """Leetcode 63. Unique Paths II.
  
  A robot is located at the top-left corner of a m x n grid 
  (marked 'Start' in the diagram below).
  
  The robot can only move either down or right at any point in time. 
  The robot is trying to reach the bottom-right corner of the grid (marked 'Finish' in the diagram below).
  
  Now consider if some obstacles are added to the grids. 
  How many unique paths would there be?
  
  An obstacle and empty space is marked as 1 and 0 respectively in the grid.
  
  Note: m and n will be at most 100.
  
  Example 1:
  
  Input:
  [
    [0,0,0],
    [0,1,0],
    [0,0,0]
  ]
  Output: 2
  """
  
  def main():
      pass
  
  
  if __name__ == '__main__':
      main()
  
subject: Add lc_063_unique_paths_II.py