Find Duplicate Characters in String | Dataford Interview Questions

Given a string s, return all characters that appear more than once, along with how many times each duplicate character occurs. The output should preserve the order in which duplicate characters first appear in the string. Write a function that takes a string and returns a list of [character, count] pairs.

Constraints

0 <= len(s) <= 10^5
s may contain letters, digits, spaces, or symbols
Character comparison is case-sensitive

Function Signature

def find_duplicate_characters(s):

Your question is Find Duplicate Characters in String. 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

Constraints

0 <= len(s) <= 10^5
s may contain letters, digits, spaces, or symbols
Character comparison is case-sensitive

Function Signature

def find_duplicate_characters(s):

Your question is Find Duplicate Characters in String. 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.