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[Array]
[Ordered Set]
[Prefix Sum]
Hint 1
Convert lights into an array of ranges representing the range where each street light can light up and sort the start and end points of the ranges.
Hint 2
Do we need to traverse all possible positions on the street?
Hint 3
No, we don't, we only need to go to the start and end points of the ranges for each streetlight.