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June 5, 2018 22:06
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Paint bucket problem
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| def paint_bucket(image, row, col, new_color): | |
| original_color = image[row][col] | |
| _paint(image, row, col, new_color, original_color) | |
| def _paint(image, row, col, new_color, original_color): | |
| if (row < 0 or | |
| row > len(image) - 1 or | |
| col < 0 or | |
| col > len(image[row]) - 1 or | |
| image[row][col] != original_color): | |
| return | |
| image[row][col] = new_color | |
| _paint(image, row + 1, col, new_color, original_color) | |
| _paint(image, row - 1, col, new_color, original_color) | |
| _paint(image, row, col + 1, new_color, original_color) | |
| _paint(image, row, col - 1, new_color, original_color) | |
| image = [ | |
| ['B', 'G', 'B', 'B', 'B'], | |
| ['G', 'G', 'B', 'B', 'B'], | |
| ['G', 'G', 'G', 'B', 'B'], | |
| ['B', 'B', 'G', 'B', 'B'], | |
| ['B', 'B', 'G', 'B', 'B'], | |
| ] | |
| paint_bucket(image, 0, 1, 'R') | |
| print(image) | |
| # [['B', 'R', 'B', 'B', 'B'], | |
| # ['R', 'R', 'B', 'B', 'B'], | |
| # ['R', 'R', 'R', 'B', 'B'], | |
| # ['B', 'B', 'R', 'B', 'B'], | |
| # ['B', 'B', 'R', 'B', 'B']] |
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