0841.钥匙和房间.md, 增加 Golang, Java, Python 实现

problems/0841.钥匙和房间.md

@@ -121,10 +121,109 @@ public:
 
 Java：
 
+```java
+class Solution {
+     private void dfs(int key, List<List<Integer>>  rooms, List<Boolean> visited) {
+        if (visited.get(key)) {
+            return;
+        }
+
+        visited.set(key, true);
+        for (int k : rooms.get(key)) {
+            // 深度优先搜索遍历
+            dfs(k, rooms, visited);
+        }
+    }
+
+
+    public boolean canVisitAllRooms(List<List<Integer>> rooms) {
+        List<Boolean> visited = new ArrayList<Boolean>(){{
+            for(int i = 0 ; i < rooms.size(); i++){
+                add(false);
+            }
+        }};
+
+        dfs(0, rooms, visited);
+
+        //检查是否都访问到了
+        for (boolean flag : visited) {
+            if (!flag) {
+                return false;
+            }
+        }
+        return true;
+    }
+}
+```
+
+
+
+
 Python：
 
+python3
+
+```python
+
+class Solution:
+
+    def dfs(self, key: int, rooms: List[List[int]]  , visited : List[bool] ) :
+        if visited[key] :
+            return
+
+        visited[key] = True
+        keys = rooms[key]
+        for i in range(len(keys)) :
+            # 深度优先搜索遍历
+            self.dfs(keys[i], rooms, visited)
+
+    def canVisitAllRooms(self, rooms: List[List[int]]) -> bool:
+        visited = [False for i in range(len(rooms))]
+
+        self.dfs(0, rooms, visited)
+
+        # 检查是否都访问到了
+        for i in range(len(visited)):
+            if not visited[i] :
+                return False
+        return True
+
+```
+
+
 Go：
 
+```go
+
+func dfs(key int, rooms [][]int, visited []bool ) {
+	if visited[key] {
+		return;
+	}
+
+	visited[key] = true
+	keys := rooms[key]
+	for _ , key := range keys {
+		// 深度优先搜索遍历
+		dfs(key, rooms, visited);
+	}
+}
+
+func canVisitAllRooms(rooms [][]int) bool {
+
+	visited := make([]bool, len(rooms));
+
+    dfs(0, rooms, visited);
+
+	//检查是否都访问到了
+	for i := 0; i < len(visited); i++ {
+		if !visited[i] {
+			return false;
+		}
+	}
+	return true;
+}
+```
+
 JavaScript：
 
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