问题
What is the exact meaning of lexicographical order? How it is different from alphabetical order?
回答1:
lexicographical order is alphabetical order. The other type is numerical ordering. Consider the following values,
1, 10, 2
Those values are in lexicographical order. 10 comes after 2 in numerical order, but 10 comes before 2 in "alphabetical" order.
来源：https://stackoverflow.com/questions/45950646/what-is-lexicographical-order