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You are given a collection of intervals. Merge all overlapping intervals into a single interval and return the result.
#1. Merge Intervals
Find the smallest positive integer that is missing from a given array of integers. You need to do this in linear time and constant extra space.
#2. First Missing Positive
You are given a list of meeting time intervals. Determine the minimum number of conference rooms required to accommodate all the meetings without any overlap.
#3. Meeting Rooms II