old_contents: '''
  - Leetcode problem: 733
  
  - Difficulty: Easy
  
  - Brief problem description:
  
  An image is represented by a 2-D array of integers, each integer representing the pixel value of the image (from 0
  to 65535).
  
  Given a coordinate (sr, sc) representing the starting pixel (row and column) of the flood fill, and a pixel value
  newColor, "flood fill" the image.
  
  To perform a "flood fill", consider the starting pixel, plus any pixels connected 4-directionally to the starting
  pixel of the same color as the starting pixel, plus any pixels connected 4-directionally to those pixels (also with the
  same color as the starting pixel), and so on. Replace the color of all of the aforementioned pixels with the newColor.
  
  At the end, return the modified image.
  
  Example 1:
  Input:
  image = [[1,1,1],[1,1,0],[1,0,1]]
  sr = 1, sc = 1, newColor = 2
  Output: [[2,2,2],[2,2,0],[2,0,1]]
  Explanation:
  From the center of the image (with position (sr, sc) = (1, 1)), all pixels connected
  by a path of the same color as the starting pixel are colored with the new color.
  Note the bottom corner is not colored 2, because it is not 4-directionally connected
  to the starting pixel.
  Note:
  
  The length of image and image[0] will be in the range [1, 50].
  The given starting pixel will satisfy 0 <= sr < image.length and 0 <= sc < image[0].length.
  The value of each color in image[i][j] and newColor will be an integer in [0, 65535].
  
  - Solution Summary:
  
  - Used Resources:
  
  --- Bo Zhou
  '''
  
  
  class Solution:
      def floodFill(self, image: List[List[int]], sr: int, sc: int, newColor: int) -> List[List[int]]:
          if (newColor != image[sr][sc]):
              self.floodImage(image, sr, sc, image[sr][sc], newColor)
          return image
  
      def floodImage(self, image, x, y, oldValue, newValue):
          if x < 0 or y < 0 or x > len(image) - 1 or y > len(image[0]) - 1 or image[x][y] != oldValue:
              return
          image[x][y] = newValue
          self.floodImage(image, x - 1, y, oldValue, newValue)
          self.floodImage(image, x + 1, y, oldValue, newValue)
          self.floodImage(image, x, y - 1, oldValue, newValue)
          self.floodImage(image, x, y + 1, oldValue, newValue)
new_contents: '''
  - Leetcode problem: 733
  
  - Difficulty: Easy
  
  - Brief problem description:
  
  An image is represented by a 2-D array of integers, each integer representing the pixel value of the image (from 0
  to 65535).
  
  Given a coordinate (sr, sc) representing the starting pixel (row and column) of the flood fill, and a pixel value
  newColor, "flood fill" the image.
  
  To perform a "flood fill", consider the starting pixel, plus any pixels connected 4-directionally to the starting
  pixel of the same color as the starting pixel, plus any pixels connected 4-directionally to those pixels (also with the
  same color as the starting pixel), and so on. Replace the color of all of the aforementioned pixels with the newColor.
  
  At the end, return the modified image.
  
  Example 1:
  Input:
  image = [[1,1,1],[1,1,0],[1,0,1]]
  sr = 1, sc = 1, newColor = 2
  Output: [[2,2,2],[2,2,0],[2,0,1]]
  Explanation:
  From the center of the image (with position (sr, sc) = (1, 1)), all pixels connected
  by a path of the same color as the starting pixel are colored with the new color.
  Note the bottom corner is not colored 2, because it is not 4-directionally connected
  to the starting pixel.
  Note:
  
  The length of image and image[0] will be in the range [1, 50].
  The given starting pixel will satisfy 0 <= sr < image.length and 0 <= sc < image[0].length.
  The value of each color in image[i][j] and newColor will be an integer in [0, 65535].
  
  - Solution Summary:
  
  - Used Resources:
  
  --- Bo Zhou
  '''
  
  
  class Solution:
      def floodFill(self, image: List[List[int]], sr: int, sc: int, newColor: int) -> List[List[int]]:
          if (newColor != image[sr][sc]):
              self.floodImage(image, sr, sc, image[sr][sc], newColor)
          return image
  
      def floodImage(self, image, x, y, oldValue, newValue):
          if x < 0 or y < 0 or x > len(image) - 1 or y > len(image[0]) - 1 or image[x][y] != oldValue:
              return
          image[x][y] = newValue
          self.floodImage(image, x - 1, y, oldValue, newValue)
          self.floodImage(image, x + 1, y, oldValue, newValue)
          self.floodImage(image, x, y - 1, oldValue, newValue)
          self.floodImage(image, x, y + 1, oldValue, newValue)
  
subject: update problem 733