day 7

day-07/part-1.py

@@ -0,0 +1,25 @@
+import aocd
+
+def parse(data):
+    return filter(None, [set(x for x, c in enumerate(line) if c != '.') for line in data.strip().split('\n')])
+
+def num_splits(manifold):
+    total = 0
+    
+    beams, *rows = manifold
+    for row in rows:
+        for splitter in row:
+            if splitter in beams:
+                beams.remove(splitter)
+                beams |= {splitter-1, splitter+1}
+                total += 1
+
+    return total
+
+def main(data):
+    return num_splits(parse(data))
+
+if __name__ == '__main__':
+    solution = main(aocd.get_data(day=7, year=2025))
+    print(solution)
+    aocd.submit(solution, part='a', day=7, year=2025)

day-07/part-2.py

@@ -0,0 +1,26 @@
+import aocd
+
+import collections
+
+def parse(data):
+    return filter(None, [set(x for x, c in enumerate(line) if c != '.') for line in data.strip().split('\n')])
+
+def num_timelines(manifold):
+    timelines, *rows = manifold
+    timelines = collections.Counter(timelines)
+    for row in rows:
+        for splitter in row:
+            if splitter in timelines:
+                timelines[splitter-1] += timelines[splitter]
+                timelines[splitter+1] += timelines[splitter]
+                del timelines[splitter]
+
+    return sum(timelines.values())
+
+def main(data):
+    return num_timelines(parse(data))
+
+if __name__ == '__main__':
+    solution = main(aocd.get_data(day=7, year=2025))
+    print(solution)
+    aocd.submit(solution, part='b', day=7, year=2025)