问答题A postman delivers mail round a housing estate. He does not want to visit the same street more than once, but can pass over the same street corners. On which housing estate is this possible?
题目
问答题
A postman delivers mail round a housing estate.
He does not want to visit the same street more than once, but can pass over the same street corners.
On which housing estate is this possible?
He does not want to visit the same street more than once, but can pass over the same street corners.
On which housing estate is this possible?