中文翻译：每天选择一条存在的出边走过去。

然后我就不懂了，如果没有可行的出边咋办？？

看了下原题面：At each moment you can either travel to another galaxy through one of wormholes that exist at this moment or you can simply wait for one galaxy day to see which wormholes will lead from your current position at the next day.

也就是，应这样翻译：

每天选择一条存在的出边走过去或停留在原地不动。