Detect Duplicate String Values | Dataford Interview Questions

Find duplicate values in a String.

Return each duplicated alphabetic value once, ordered by when its duplicate is encountered. Lowercase letters establish values, repeated lowercase letters count as duplicates, and an uppercase letter counts as a duplicate only when its lowercase value appeared earlier. Ignore non-alphabetic characters.

Input: one string s. Output: a list of lowercase strings.

Example 1: s = "programming" returns ["r", "m", "g"].

Example 2: s = "Sears QA" returns ["a"], because a appears before A; the initial uppercase S does not establish a lowercase value.

Constraints: 0 <= len(s) <= 10^5; characters may be letters, spaces, or punctuation.

Constraints

0 <= len(s) <= 10^5
Characters may be alphabetic, whitespace, or punctuation
Return values in the order their duplicates are first encountered
Each returned value appears only once

Function Signature

def find_duplicate_values(s):

Your question is Detect Duplicate String Values. 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