367. Valid Perfect Square
/*
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
Returns: True
Example 2:
Input: 14
Returns: False
*/
//思路,开方之后,判断是否是整数即(int)(num)==num;
//62.5% 0ms
bool isPerfectSquare(int num) {
if((int)(sqrt(num))==sqrt(num))
return true;
else
return false;
}
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