Find Duplicate Characters in String | Dataford Interview Questions

Problem

Given a string s, return all duplicate characters in the order they first become confirmed as duplicates. A character is a duplicate if it appears more than once in the string. Return the result as a list of characters, with each duplicate character included only once.

Constraints

0 <= len(s) <= 10^5
s may contain lowercase letters, uppercase letters, digits, spaces, or symbols
Return each duplicate character only once

Problem

Constraints

0 <= len(s) <= 10^5
s may contain lowercase letters, uppercase letters, digits, spaces, or symbols
Return each duplicate character only once

Problem

Constraints

0 <= len(s) <= 10^5
s may contain lowercase letters, uppercase letters, digits, spaces, or symbols
Return each duplicate character only once

Problem

Constraints

0 <= len(s) <= 10^5
s may contain lowercase letters, uppercase letters, digits, spaces, or symbols
Return each duplicate character only once