this time with no legal info

7/ex2.py

@@ -0,0 +1,32 @@
+def count_timelines(grid): # Dynamic programming my beloved/behated
+    num_rows = len(grid)
+    num_cols = len(grid[0])
+
+    counts = [1 if grid[0][c] == 'S' else 0 for c in range(num_cols)]
+
+    for r in range(num_rows):
+        next_counts = [0] * num_cols
+        row = grid[r]
+        for c in range(num_cols):
+            k = counts[c]
+            if k == 0:
+                continue
+            if row[c] == '^':
+                if c > 0:
+                    next_counts[c - 1] += k
+                if c + 1 < num_cols:
+                    next_counts[c + 1] += k
+            else:
+                next_counts[c] += k
+        counts = next_counts
+
+    return sum(counts)
+
+
+with open('input.txt', 'r') as f:
+    lines = [line.rstrip('\n') for line in f]
+
+grid = [list(line) for line in lines]
+
+total = count_timelines(grid)
+print(total)