First Unique Stream Character | Dataford Interview Questions

Find the first non-repeating character in a continuous stream of telemetry data.

Implement first_non_repeating_stream(stream). The input is a string processed from left to right. Return a list containing the first character whose frequency is one after each character arrives, or None if no such character exists.

Constraints

0 <= len(stream) <= 5,000
The stream contains arbitrary single-character strings
Return one output value for each character in stream
Use None when no non-repeating character exists

Function Signature

def first_non_repeating_stream(stream):

Your question is First Unique Stream 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

Find the first non-repeating character in a continuous stream of telemetry data.

Constraints

0 <= len(stream) <= 5,000
The stream contains arbitrary single-character strings
Return one output value for each character in stream
Use None when no non-repeating character exists

Function Signature

def first_non_repeating_stream(stream):

Your question is First Unique Stream 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.