Finding the First Unique Character | Dataford Interview Questions

How would you solve the problem of finding the first unique character in a string?

Implement first_unique_char(s), returning the zero-based index of the first character whose total frequency is one, or -1 if no such character exists. The input is a string, including the possibility of an empty string, and the result is an integer.

Constraints

0 <= len(s) <= 1000
The string may contain lowercase English letters.
Return a zero-based index or -1.

Function Signature

def first_unique_char(s):

Your question is Finding the First Unique Character. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

How would you solve the problem of finding the first unique character in a string?

Constraints

0 <= len(s) <= 1000
The string may contain lowercase English letters.
Return a zero-based index or -1.

Function Signature

def first_unique_char(s):

Your question is Finding the First Unique Character. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.