Day 7 2025

1 files changed, 15 insertions, 0 deletions

diff --git a/2025/07/b.py b/2025/07/b.py
new file mode 100644
index 0000000..41c0db0
--- /dev/null
+++ b/2025/07/b.py
@@ -0,0 +1,15 @@
+import fileinput
+
+with fileinput.input() as lines:
+        rows = [line[:-1] for line in lines]
+        pos = {rows[0].find('S'): 1}
+
+for row in rows[1:]:
+        newpos = {}
+        for p, w in pos.items():
+                for pp in [p-1,p+1] if row[p] == '^' else [p]:
+                        t = newpos.get(pp, 0)
+                        newpos[pp] = t + w
+        pos = dict(newpos)
+
+print(sum(pos.values()))