string - What is lexicographical order? - Stack Overflow Alphabetical ordering includes variants that differ in how to handle spaces, uppercase characters, numerals, and punctuation Purists believe that allowing characters other than a-z makes the sort not "alphabetic" and therefore it must fall in to the larger class of "lexicographic" Again, wikipedia has additional details
lexicographic - What does lexicographically mean? - Stack Overflow In this reference we see, "In mathematics, the lexicographic or lexicographical order (also known as lexical order, or dictionary order) is a generalization of the alphabetical order of the dictionaries to sequences of ordered symbols or, more generally, of elements of a totally ordered set "
lexicographic ordering - What is exact meaning of lexicographically . . . Yes, that is correct With words lexicographic order is what we naturally expect It's not so for numbers Lexicographic sorting does not order them the way most people expect, with your example of 2 and 11 being a great illustration –
Generating Permutations in Lexicographic Order vs Sorting? There's a fairly easy way to generate the nth permutation in lexicographic order The set of choices you make in selecting the permutation elements are: pick 1 of N, then 1 of N-1, then 1 of N-2, then 1 of 2, and finally there's just one left
c++ - Definition of a lexicographical order? - Stack Overflow Lexicographic ordering is particularly useful if the elements of the sequence have some specific meaning, with the earlier values giving a higher precedence For example, consider these times: 9:13 AM and 8:25 AM If we represent these with the sequence (9,13) and (8,25), then (8,25) comes before (9,13) because 8 comes before 9
Algorithm for finding numerical permutation given lexicographic index Here is a simple solution: from math import factorial # python math library i = 5 # i is the lexicographic index (counting starts from 0) n = 3 # n is the length of the permutation p = range(1, n + 1) # p is a list from 1 to n for k in range(1, n + 1): # k goes from 1 to n f = factorial(n - k) # compute factorial once per iteration d = i f # use integer division (like division + floor
testing - How to explain sorting (numerical, lexicographical and . . . Use a phone book analogy: "numerical" is like phone numbers "Lexicographic" is like the way names are ordered in a phone book "Collation" is like the difference between a French and a Spanish phone book IF your tester is less than 20 years old, she may not know what a "phone book" is, though –
java - Lexicographic sorting with a Trie - Stack Overflow Lexicographic sorting of a set of keys can be accomplished with a simple trie-based algorithm as follows: Insert all keys in a trie Output all keys in the trie by means of pre-order traversal, which results in output that is in lexicographically increasing order However, this is my testing with my standard trie implementation:
Whats the simplest way of defining lexicographic comparison for . . . If I have a class that I want to be able to sort (ie support a less-than concept), and it has several data items such that I need to do lexicographic ordering then I need something like this: struct MyData { string surname; string forename; bool operator<(const MyData other) const { return surname < other surname || (surname==other surname