How should I practice Minimum Meeting Rooms?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Oracle onsite interview problems in FastPrep.

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Minimum Meeting Rooms

Oracle● MediumFULLTIMEONSITE INTERVIEW

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Problem statement

You are given meeting intervals [start, end]. Return the minimum number of rooms needed to hold every meeting without overlapping meetings in the same room.

Each interval is half-open: it includes its start and excludes its end. A meeting ending at time t may share a room with another starting at t. Input order is arbitrary; duplicate intervals represent separate meetings. Return 0 for no meetings.

Function

minMeetingRooms(intervals: int[][]) → int

Examples

Example 1

intervals = [[0,30],[5,10],[15,20]]return = 2

The long meeting overlaps each shorter meeting; the shorter meetings share a second room.

Example 2

intervals = [[7,10],[2,4]]return = 1

The meetings do not overlap.

Example 3

intervals = [[1,3],[3,5],[5,8]]return = 1

A room is reusable exactly at its previous meeting end.

Constraints

0 <= intervals.length <= 100000.
Each row contains exactly two integers.
0 <= start < end <= 10^9.