Distinct Characters
May 9, 2017
We’ve done similar exercises in the past:
Write a program to determine if all the characters in a string are distinct. For instance, the word “Programming” has two m and two g, so all the characters are not distinct, but the word “Praxis” has six distinct characters.
Your task is to write a program to determine if all the characters in a string are distinct; you should provide three solutions, one that takes time O(n²), one that takes time O(n log n), and one that takes time O(n). When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.
Programming Praxis 