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authorVincent Ambo <mail@tazj.in>2021-12-13T22·51+0300
committerVincent Ambo <mail@tazj.in>2021-12-13T23·15+0300
commit019f8fd2113df4c5247c3969c60fd4f0e08f91f7 (patch)
tree76a857f61aa88f62a30e854651e8439db77fd0ea /users/wpcarro/scratch/facebook/recursion-and-dynamic-programming/paint-fill.py
parent464bbcb15c09813172c79820bcf526bb10cf4208 (diff)
parent6123e976928ca3d8d93f0b2006b10b5f659eb74d (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.py36
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