Day 12 (minified)

day12/part1.min.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+import numpy as np
+
+lines = np.array([np.array([ord(y) for y in x.strip()]) for x in open("input.txt")])
+start = tuple(np.array(np.where(lines == ord('S'))).T[0])
+end = tuple(np.array(np.where(lines == ord('E'))).T[0])
+
+lines[start] = ord('a')
+lines[end] = ord('z')
+lines = lines-ord('a')
+
+
+open = [(0, start, None)]
+closed = dict()
+while open:
+    prio, n, prev = open.pop(0)
+    if n in closed:
+        continue
+    closed[n] = (prio, prev)
+    if n == end:
+        path = [n]
+        while path[-1] is not None:
+            path.append(closed[path[-1]][1])
+        print(len(path)-2)
+        break
+
+    for dx, dy in [(-1, 0), (0, -1), (1, 0), (0, 1)]:
+        xn, yn = n[0]+dx, n[1]+dy
+        if 0 <= xn < len(lines) and 0 <= yn < len(lines[0]) and lines[n] + 1 >= lines[xn, yn]:
+            open.append((prio+1, (xn, yn), n))

day12/part1.py

@@ -53,8 +53,6 @@ def find_path(start, end_fnct, neighbors_fnct, heuristic_cost_estimate_fnct, dis
     return None
 
 
-
-
 path = list(find_path(
     start,
     end_fnct=is_end,

day12/part2.min.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+import numpy as np
+
+lines = np.array([np.array([ord(y) for y in x.strip()]) for x in open("input.txt")])
+start = tuple(np.array(np.where(lines == ord('S'))).T[0])
+end = tuple(np.array(np.where(lines == ord('E'))).T[0])
+
+lines[start] = ord('a')
+lines[end] = ord('z')
+lines = lines-ord('a')
+
+
+open = [(0, end, None)]
+closed = dict()
+while open:
+    prio, n, prev = open.pop(0)
+    if n in closed:
+        continue
+    closed[n] = (prio, prev)
+    if lines[n] == 0:
+        path = [n]
+        while path[-1] is not None:
+            path.append(closed[path[-1]][1])
+        print(len(path)-2)
+        break
+
+    for dx, dy in [(-1, 0), (0, -1), (1, 0), (0, 1)]:
+        xn, yn = n[0]+dx, n[1]+dy
+        if 0 <= xn < len(lines) and 0 <= yn < len(lines[0]) and lines[n] - 1 <= lines[xn, yn]:
+            open.append((prio+1, (xn, yn), n))

day12/part2.py

@@ -53,8 +53,6 @@ def find_path(start, end_fnct, neighbors_fnct, heuristic_cost_estimate_fnct, dis
     return None
 
 
-
-
 path = list(find_path(
     end,
     end_fnct=is_end,