Day 3b

day3b.py

+from functools import reduce
+
+def main():
+    with open("input3.txt") as file:
+        lines = file.readlines()
+    grid = [list(line.strip()) for line in lines]
+    print(grid[0])
+    wrap = len(grid[0])
+    treebumps = []
+    routes = [[1,1],[3,1],[5,1],[7,1],[1,2]]
+    for route in routes:
+        coords = [0,0] # x, y - across, down
+        trees = 0
+        while coords[1] < len(grid):
+            if grid[coords[1]][coords[0]] == "#":
+                trees += 1
+            coords[0] = coords[0] + route[0]
+            coords[1] = coords[1] + route[1]
+            if coords[0] >= wrap:
+                coords[0] = coords[0] - wrap
+        print(f"It's been a long toboggan trip going {route[0]} right and {route[1]} down, and I encountered {trees} trees.")
+        treebumps.append(trees)
+    total = reduce((lambda x,y: x*y), treebumps)
+    print(f"I encountered these trees: {treebumps} - those produce {total}.")
+
+
+if __name__ == "__main__":
+    main()