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// @Title: 灯泡开关 (Bulb Switcher)
// @Author: 15816537946@163.com
// @Date: 2021-11-15 08:43:28
// @Runtime: 0 ms
// @Memory: 1.9 MB
func bulbSwitch(n int) int {
    return int(math.Sqrt(float64(n)))
}