3951. Minimum Energy to Maintain Brightness

You are given an integer n, representing n light bulbs arranged in a line and indexed from 0 to n - 1. You are also given an integer brightness and a 2D integer array intervals, where intervals[i] = [starti, endi] represents an inclusive time interval during which the lighting requirement must be satisfied. At each time unit, every bulb can independently be either on or off. A bulb that is on il