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// @Title: 有效的完全平方数 (Valid Perfect Square)
// @Author: 15816537946@163.com
// @Date: 2021-11-04 14:44:46
// @Runtime: 0 ms
// @Memory: 1.9 MB
func isPerfectSquare(num int) bool {
	b := float64(num)
	a := int(math.Sqrt(b))
	return a*a == num
}