12: Solve in Python

12/input

@@ -0,0 +1,41 @@
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12/solution.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+
+import sys
+from collections import deque
+
+def solve(hmap, startpos, endpos, reverse = False):
+    dirs = [(-1, 0), (0, -1), (1, 0), (0, 1)]
+    h, w = len(hmap), len(hmap[0])
+
+    visited = set()
+    visited.add(startpos)
+
+    minsteps = float("inf")
+
+    queue = deque([(*startpos, 0)])
+    while len(queue):
+        y, x, steps = queue.popleft()
+
+        if (reverse and hmap[y][x] == ord("a")) or (y, x) == endpos:
+            minsteps = min(minsteps, steps)
+            continue
+
+        for d in dirs:
+            ny, nx = y + d[0], x + d[1]
+            if 0 <= ny < h and 0 <= nx < w:
+                diff = hmap[ny][nx] - hmap[y][x]
+                if reverse:
+                    cond = diff == -1 or hmap[ny][nx] >= hmap[y][x]
+                else:
+                    cond = diff == 1 or hmap[ny][nx] <= hmap[y][x]
+                if cond:
+                    c = (ny, nx)
+                    if c not in visited:
+                        visited.add(c)
+                        queue.append((*c, steps + 1))
+
+    return minsteps
+
+hmap = [list(l.strip()) for l in sys.stdin]
+
+for i, y in enumerate(hmap):
+    for j, x in enumerate(y):
+        if x == "S":
+            startpos = (i, j)
+            hmap[i][j] = "a"
+        elif x == "E":
+            endpos = (i, j)
+            hmap[i][j] = "z"
+        hmap[i][j] = ord(hmap[i][j])
+
+print("Silver:", solve(hmap, startpos, endpos))
+print("Gold:", solve(hmap, endpos, startpos, True))