The given problem was -
Given a calendar of N people.
Calendar is marked as Blocked if person is not available (both days inclusive)
Return number of days when all are available in given D days.
person 1 - [2,3], [9,10]
person 2 - [4,5]
person 3 - [7,9]
D = 10
output = 2 (1, 6)
Follow up : Return number of days when at least P people are available.
Edit - Adding constraints,
Lists are not sorted.
1 <= D <= 10^5
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