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Count Days Without Meetings

You are given a positive integer days representing the total number of days an employee is available for work (starting from day 1).

You are given a positive integer days representing the total number of days an employee is available for work (starting from day 1). You are also given a 2D array meetings of size n where, meetings[i] = [start_i, end_i] represents the starting and ending days of meeting i (inclusive).

Return the count of days when the employee is available for work but no meetings are scheduled.

Note: The meetings may overlap.

Example 1

Input: days = 10, meetings = [[5,7],[1,3],[9,10]]

Output: 2

Explanation: There is no meeting scheduled on the 4 th and 8 th days.

Example 2

Input: days = 5, meetings = [[2,4],[1,3]]

Output: 1

Explanation: There is no meeting scheduled on the 5 th day.

Example 3

Input: days = 6, meetings = [[1,6]]

Output: 0

Explanation: Meetings are scheduled for all working days.

Constraints

  • 1 <= days <= 10^9
  • 1 <= meetings.length <= 10^5
  • meetings[i].length == 2
  • 1 <= meetings[i][0] <= meetings[i][1] <= days

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