Java | Leetcode Java题解之第367题有效的完全平方数
题目：
题解：
class Solution {public boolean isPerfectSquare(int num) {double x0 = num;while (true) {double x1 = (x0 + num / x0) / 2;if (x0 - x1 < 1e-6) {break;}x0 = x1;}int x = (int) x0;return x * x == num;}
}
题目：
题解：
class Solution {public boolean isPerfectSquare(int num) {double x0 = num;while (true) {double x1 = (x0 + num / x0) / 2;if (x0 - x1 < 1e-6) {break;}x0 = x1;}int x = (int) x0;return x * x == num;}
}