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32
votes
4answers
2k views

Etymology of “String”

So it's obvious that a string of things is a sequence of things, and so a sequence of characters/bytes/etc. might as well be called a string. But who first called them strings? And when? And in what ...
1
vote
4answers
1k views

Regex to String generation

Let's say that we have a regex and an index i. If we suppose that the set of strings that match our regex are sorted in a lexicographical order, how could we get the i element of this list? Edit : I ...
20
votes
5answers
2k views

Why are strings so slow?

Ever since my very first programming class in high school, I've been hearing that string operations are slower — i.e. more costly — than the mythical "average operation." Why makes them so ...
1
vote
3answers
1k views

Search for a sub-string in a given array of strings

I have an array of n strings. I want to select all the elements of the array that starts with the given string. Sorry if that is not clear. I'll give an example. input = "as" array = ["abas", ...
10
votes
6answers
2k views

Is it inefficient to concatenate strings one at a time?

I recall back from my days of programming in C that when two strings are joined, the OS must allocate memory for the joined string, then the program can copy all the string text over to the new area ...
3
votes
2answers
199 views

Algorithm for finding automorphisms of a string in O(n) time

I recently stumbled upon this problem, which requires a solution in O(n) time, and I'm struggling to find a correct one. The obvious, naive solution runs in O(n²) time. Any ideas? A string S = ...