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题目：
题解：
func mySqrt(x int) int {if x == 0 {return 0}C, x0 := float64(x), float64(x)for {xi := 0.5 * (x0 + C/x0)if math.Abs(x0 - xi) < 1e-7 {break}x0 = xi}return int(x0)
}
题目：
题解：
func mySqrt(x int) int {if x == 0 {return 0}C, x0 := float64(x), float64(x)for {xi := 0.5 * (x0 + C/x0)if math.Abs(x0 - xi) < 1e-7 {break}x0 = xi}return int(x0)
}