Longest Online Consecutive Run | Dataford Interview Questions

Find the longest consecutive sequence of online users from a real-time presence log. Given a list of [user_id, status] entries in chronological order, return the user IDs from the longest contiguous run whose status is "online". If multiple runs have the same length, return the earliest run. Implement longest_online_sequence(log).

Constraints

0 <= len(log) <= 1000
Each log entry contains exactly one user ID and one status
status is either "online" or "offline"
User IDs are strings
Return the earliest run when multiple runs share the maximum length

Function Signature

def longest_online_sequence(log):

Your question is Longest Online Consecutive Run. 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(log) <= 1000
Each log entry contains exactly one user ID and one status
status is either "online" or "offline"
User IDs are strings
Return the earliest run when multiple runs share the maximum length

Function Signature

def longest_online_sequence(log):

Your question is Longest Online Consecutive Run. 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.