Clean up and alternative solution to day 7

1 files changed, 17 insertions, 0 deletions

diff --git a/2025/07/b2.py b/2025/07/b2.py
new file mode 100644
index 0000000..b77188c
--- /dev/null
+++ b/2025/07/b2.py
@@ -0,0 +1,17 @@
+import fileinput
+
+with fileinput.input() as lines:
+        rows = [line[:-1] for line in lines]
+
+t = [1 if x == 'S' else 0 for x in rows[0]]
+for row in rows[1:]:
+        next = [0] * len(row)
+        for i in range(len(row)):
+                if row[i] == '^':
+                        next[i-1] += t[i]
+                        next[i+1] += t[i]
+                else:
+                        next[i] += t[i]
+        t = next
+
+print(sum(t))