If you do not understand this code listing, you should read the documentation for the map and sort functions carefully.
如果不理解这个代码清单，则应该仔细阅读有关map和sort函数的文档。
If you do not understand this code listing, you should read the documentation for the map and sort functions carefully.
如果不理解这个代码清单，则应该仔细阅读有关map和sort函数的文档。
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