Leetcode 3440. Reschedule Meetings for Maximum Free Time II

Given non-overlapping meetings within [0, eventTime], you may move at most one meeting (keeping its duration and staying inside the event, with no overlaps) to maximize the length of the longest continuous free time interval; return that maximum. With n up to 1e5 and times sorted, the challenge is to pick which interval to relocate and where to insert it to best create or merge gaps (prefix/suffix/gap analysis rather than brute force).