LeetBook--队列&栈--钥匙和房间

src/main/java/leet/book/queueStack/CanVisitAllRooms.java

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+package leet.book.queueStack;
+
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Queue;
+
+/**
+ * Created with IntelliJ IDEA.
+ *
+ * @author: 轩辕龙儿
+ * @date: 2021/7/2 16:09
+ * @Description: No Description
+ */
+public class CanVisitAllRooms {
+    class Solution {
+        public boolean canVisitAllRooms(List<List<Integer>> rooms) {
+            int num = rooms.size();
+            List<Integer> use = new ArrayList<>();
+            Queue<Integer> queue = new LinkedList<>();
+            queue.offer(0);
+            use.add(0);
+            if (num == use.size()) {
+                return true;
+            }
+            while (!queue.isEmpty()) {
+                int open = queue.poll();
+                for (int room : rooms.get(open)) {
+                    if (use.contains(room)) {
+                        continue;
+                    }
+                    queue.offer(room);
+                    use.add(room);
+                    if (num == use.size()) {
+                        return true;
+                    }
+                }
+            }
+            return false;
+        }
+    }
+}