leetcode: finished #752

content/leetcode/2024/1.md

@@ -3,6 +3,47 @@ title: 2024.1
 draft: false
 ---
 
+# 2024.1.23
+
+```python
+#
+# @lc app=leetcode.cn id=752 lang=python3
+#
+# [752] 打开转盘锁
+#
+
+
+# @lc code=start
+class Solution:
+    def openLock(self, deadends: List[str], target: str) -> int:
+        def neighbors(node):
+            for i in range(4):
+                x = int(node[i])
+                for d in (-1, 1):
+                    y = (x + d) % 10
+                    yield node[:i] + str(y) + node[i + 1 :]
+
+        dead = set(deadends)
+        if "0000" in dead:
+            return -1
+        q = deque([("0000", 0)])
+        seen = {"0000"}
+
+        while q:
+            node, depth = q.popleft()
+            if node == target:
+                return depth
+            for nei in neighbors(node):
+                if nei not in seen and nei not in dead:
+                    seen.add(nei)
+                    q.append((nei, depth + 1))
+
+        return -1
+
+
+# @lc code=end
+```
+
 # 2024.1.22
 
 ```python