[LeetCode] Bulb Switcher II

672. Bulb Switcher II There is a room with n bulbs labeled from 1 to n that all are turned on initially, and four buttons on the wall. Each of the four buttons has a different functionality where: Button 1: Flips the status of all the bulbs. Button 2: Flips the status of all the bulbs with even labels (i.e., 2, 4, …). Button 3: Flips the status of all the bulbs with odd labels (i.e., 1, 3, …). Button 4: Flips the status of all the bulbs with a label j = 3k + 1 where k = 0, 1, 2, … (i.e., 1, 4,...

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