Intervals Intersecting at Point

You are given a two-dimensional list of integers intervals and an integer point. Each element contains [start, end] represents an inclusive interval.

Return the number of intervals that are intersecting at point.

Constraints

• n ≤ 100,000 where n is the length of intervals

https://binarysearch.com/problems/Intervals-Intersecting-at-Point

Examples

Example 1

Input

• intervals =

[[ 1, 5],
 [ 3, 9],
 [ 4, 8],
 [10,13]]

• point = 4

Output

• answer = 3

Explanation

At time 4, there are 3 intervals that are intersecting: [1, 5], [3, 9], [4, 8]

Solution