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Meeting Rooms II

Given a list of meeting time intervals [start, end), find the minimum number of conference rooms needed so that no two overlapping meetings share a room.

Constraints

1 ≤ intervals.length ≤ 10^4
0 ≤ start < end ≤ 10^6

Examples

in: intervals = [[0,30],[5,10],[15,20]]

out: 2

in: intervals = [[7,10],[2,4]]

out: 1

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