list - 转换具有更高功能的图形

Question

我有一个类似的图表：[("a","b"),("a","c"),("a","d"),("b","e"),("c","f"),("d","e"),("e","f"),("e","g"),("f","d")]我需要将其转换为：

[("a",["b","c","d"]),("b",["e"]) ...]

因为它是一个大学项目我只能使用更高的功能和 Data.List

谁能帮我？

谢谢

Answer 1

由于这是作业，我只给你一个提示：看看Data.List.groupBy.