标签：func input nbsp cti library perfect NPU als inpu
Given a positive integer num, write a function which returns True if num is a perfect square else False.
Note: Do not use any built-in library function such as sqrt.
Example 1:
Input: 16
Output: true
Example 2:
Input: 14 Output: false
class Solution { public boolean isPerfectSquare(int num) { if (num < 0) { return false; } int left = 0, right = num; while (left <= right) { long mid = left + (right - left) / 2; if (mid * mid == num) { return true; } else if (mid * mid < num) { left = (int)mid + 1; } else { right = (int)mid - 1; } } return false; } }
[LC] 367. Valid Perfect Square
标签：func input nbsp cti library perfect NPU als inpu
原文地址：https://www.cnblogs.com/xuanlu/p/11875871.html
