I think my algorithm is just right,but got RUNTIME ERROR when judge it.

anyone can help me?

python of course

```
class Solution:
# @param node, a undirected graph node
# @return a undirected graph node
def deep_copy(self,node):
self.copyed.setdefault(node,None)
if self.copyed[node]!=None:
return self.copyed[node]
ans = UndirectedGraphNode(node.label)
self.copyed[node] = ans
ans.neighbors = map(lambda x:self.deep_copy(x),node.neighbors)
return ans
def cloneGraph(self, node):
if node==None:
return None
self.copyed = {}
return self.deep_copy(node);
```