What is the time and space complexity of Meeting Rooms?

Time complexity: O(n log n). Space complexity: O(1).

Meeting Rooms

Easy

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Solution Guide: Meeting Rooms

Approach

Sort meetings by start time. Then check each consecutive pair: if any meeting starts before the previous one ends, there is a conflict. This is the simplest interval overlap detection.

Complexity Analysis

Time: O(n log n)
Space: O(1)

Pattern

Sort + Linear Scan

Why It Works

Sorting by start time means the only possible overlaps are between consecutive meetings. If meeting B starts before meeting A ends (prev.end > curr.start), they overlap. One pass after sorting is sufficient.

Updated Feb 2026