Update shortest-path-in-a-hidden-grid.py

kamyu104 · web-flow · commit c1ddd5c1cec6 · 2021-08-17T00:06:47.000+08:00
diff --git a/Python/shortest-path-in-a-hidden-grid.py b/Python/shortest-path-in-a-hidden-grid.py
@@ -41,7 +41,7 @@ def dfs(pos, target, master, lookup, adj):
                 master.move(rollback[d])
                         
         def bi_bfs(adj, start, target):
-            left, right = set([start]), set([target])
+            left, right = {start}, {target}
             lookup = set()
             steps = 0
             while left:
