day 12

py-ver/12.py

@@ -0,0 +1,93 @@
+from queue import Queue
+
+with open("12.txt") as f:
+  data = f.read()
+
+ex_data = """Sabqponm
+abcryxxl
+accszExk
+acctuvwj
+abdefghi"""
+
+def parse_data(data):
+  arr = dict()
+
+  for y, line in enumerate(data.splitlines()):
+    line = line.strip()
+    for x, c in enumerate(line):
+      if c == "S": start = (x, y); arr[x, y] = "a"
+      elif c == "E": end = (x, y); arr[x, y] = "z"
+      else: arr[x, y] = c
+
+  return arr, start, end
+
+def solve1(data):
+  arr, start, end = parse_data(data)
+
+  q = Queue()
+  q.put((0, start))
+
+  dirs = [(0, 1), (1, 0), (0, -1), (-1, 0)]
+  v = dict()
+
+  while not q.empty():
+    # print(q.queue)
+    steps, (x, y) = q.get()
+    if (x, y) == end:
+      print(steps)
+      break
+    if (x, y) in v:
+      continue
+    v[x, y] = steps
+    height = arr[x, y]
+
+    for (dx, dy) in dirs:
+      neighbor = (x + dx, y + dy)
+      if neighbor not in arr: continue
+      if neighbor in v: continue
+      nheight = arr[neighbor]
+      if ord(nheight) - ord(height) <= 1:
+        q.put((steps + 1, neighbor))
+
+    # input()
+
+def solve2(data):
+  arr, _, end = parse_data(data)
+
+  starts = set()
+  for coord, c in arr.items():
+    if c == "a": starts.add(coord)
+
+  min_dist = len(arr)
+  for start in starts:
+    q = Queue()
+    q.put((0, start))
+
+    dirs = [(0, 1), (1, 0), (0, -1), (-1, 0)]
+    v = dict()
+
+    while not q.empty():
+      # print(q.queue)
+      steps, (x, y) = q.get()
+      if (x, y) == end:
+        min_dist = min(min_dist, steps)
+        break
+      if (x, y) in v:
+        continue
+      v[x, y] = steps
+      height = arr[x, y]
+
+      for (dx, dy) in dirs:
+        neighbor = (x + dx, y + dy)
+        if neighbor not in arr: continue
+        if neighbor in v: continue
+        nheight = arr[neighbor]
+        if ord(nheight) - ord(height) <= 1:
+          q.put((steps + 1, neighbor))
+  print(min_dist)
+
+solve1(ex_data)
+solve1(data)
+
+solve2(ex_data)
+solve2(data)

py-ver/12.txt

@@ -0,0 +1,41 @@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