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author | Vincent Ambo <mail@tazj.in> | 2021-12-13T22·51+0300 |
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committer | Vincent Ambo <mail@tazj.in> | 2021-12-13T23·15+0300 |
commit | 019f8fd2113df4c5247c3969c60fd4f0e08f91f7 (patch) | |
tree | 76a857f61aa88f62a30e854651e8439db77fd0ea /users/wpcarro/scratch/facebook/recursion-and-dynamic-programming/paint-fill.py | |
parent | 464bbcb15c09813172c79820bcf526bb10cf4208 (diff) | |
parent | 6123e976928ca3d8d93f0b2006b10b5f659eb74d (diff) |
subtree(users/wpcarro): docking briefcase at '24f5a642' r/3226
git-subtree-dir: users/wpcarro git-subtree-mainline: 464bbcb15c09813172c79820bcf526bb10cf4208 git-subtree-split: 24f5a642af3aa1627bbff977f0a101907a02c69f Change-Id: I6105b3762b79126b3488359c95978cadb3efa789
Diffstat (limited to 'users/wpcarro/scratch/facebook/recursion-and-dynamic-programming/paint-fill.py')
-rw-r--r-- | users/wpcarro/scratch/facebook/recursion-and-dynamic-programming/paint-fill.py | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/users/wpcarro/scratch/facebook/recursion-and-dynamic-programming/paint-fill.py b/users/wpcarro/scratch/facebook/recursion-and-dynamic-programming/paint-fill.py new file mode 100644 index 000000000000..e9e7f6a9c159 --- /dev/null +++ b/users/wpcarro/scratch/facebook/recursion-and-dynamic-programming/paint-fill.py @@ -0,0 +1,36 @@ +from collection import deque + +def fill(point, canvas, color): + if x not in canvas: + return + elif y not in canvas[x]: + return + + x, y = point + if canvas[y][x] == color: + return + canvas[y][x] = color + fill((x + 1, y), canvas, color) + fill((x - 1, y), canvas, color) + fill((x, y + 1), canvas, color) + fill((x, y - 1), canvas, color) + +def fill_bfs(point, canvas, color): + x, y = point + if x not in canvas: + return None + if y not in canvas[x]: + return None + xs = deque() + xs.append((x, y)) + while xs: + x, y = xs.popleft() + canvas[y][x] = color + for x2, y2 in [(x - 1, y), (x + 1, y), (x, y - 1), (x, y + 1)]: + if x2 not in canvas: + continue + elif y2 not in canvas[x2]: + continue + if canvas[y2][x2] != color: + xs.append((x2, y2)) + return None |