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# Valid Perfect Square LeetCode Solution

## Problem – Valid Perfect Square

Given a positive integer num, write a function which returns True if num is a perfect square else False.

Follow up: Do not use any built-in library function such as `sqrt`.

Example 1:

``````Input: num = 16
Output: true``````

Example 2:

``````Input: num = 14
Output: false``````

Constraints:

• `1 <= num <= 2^31 - 1`

### Valid Perfect Square LeetCode Solution in Python

``````    def BitwiseTrick(self, num):
root = 0
bit = 1 << 15

while bit > 0 :
root |= bit
if root > num // root:
root ^= bit
bit >>= 1
return root * root == num
``````

### Valid Perfect Square LeetCode Solution in C++

``````class Solution {
public:
bool isPerfectSquare(int num) {
int a=1;

while(num>0){
num-=a;
a+=2;
}
return(num==0);
}
};
``````

### Valid Perfect Square LeetCode Solution in Java

``````class Solution {
public boolean isPerfectSquare(int num) {
long left = 1, right = num;
while (left <= right) {
long mid = (left + right) / 2;
if (mid * mid == num) return true; // check if mid is perfect square
if (mid * mid < num) { // mid is small -> go right to increase mid
left = mid + 1;
} else {
right = mid - 1; // mid is large -> to left to decrease mid
}
}
return false;
}
}
``````
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