28 August 2026
Regular Attendees
Hard
Lists
Find the people who attended every session.
You are given a list of sessions. Each session is a list of attendee names. Return the names of people who appear in every session, keeping the order they had in the first session. If there are no sessions, return an empty list.
Constraints
Each session has no repeated namesNames are lowercase strings
Function signature
def regular_attendees(sessions):