当所给风向图是欧拉图时，由这一近似算法求得的投递员路线是最优的投递员路线。
It is also shown that the postman route obtained by this approximation algorithm is optimal if the given windy graph is Eulerian.
当所给风向图是欧拉图时，由这一近似算法求得的投递员路线是最优的投递员路线。
It is also shown that the postman route obtained by this approximation algorithm is optimal if the given windy graph is Eulerian.
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