list - 订购 int 对

Question

我有一个 int 对列表，例如：

 [(1,2),(3,5),(0,1),(1,3),(3,0),(0,3)]

我想从最小的对到最大的对这个列表进行排序。对于上面的示例，它应该是：

 [(0,1),(0,3),(1,2),(1,3),(3,0),(3,5)].

您可以假设给定输入的列表中没有相同的对。我该怎么做？

Answer 1

Just use the function sort from Data.List. It works on any type which is an instance of Ord and pairs are indeed instances.

Answer 2

Tuples of 2 Ord values (including Ints) are instances of Ord class in turn, so you can just sort the list.