Given an array of meeting time intervals intervals where intervals[i] = [start_i, end_i], return the minimum number of conference rooms required.

Example 1:

Input: intervals = [[0,30],[5,10],[15,20]]
Output: 2

Constraints:

• 0 \le intervals.length \le 10^4
• intervals[i].length = 2
• 0 \le start_i < end_i \le 10^6

Given an array of meeting time intervals intervals where intervals[i] = [start_i, end_i], return the minimum number of conference rooms required.

Example 1:

Input: intervals = [[0,30],[5,10],[15,20]]
Output: 2

Constraints:

• 0 \le intervals.length \le 10^4
• intervals[i].length = 2
• 0 \le start_i < end_i \le 10^6