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Count Squares
Basic Accuracy: 50.15% Submissions: 57143 Points: 1

Consider a sample space S consisting of all perfect squares starting from 1, 4, 9 and so on. You are given a number N, you have to output the number of integers less than N in the sample space S.

Example 1:

Input :
N = 9
Output:
2
Explanation:
1 and 4 are the only Perfect Squares
less than 9. So, the Output is 2.

Example 2:

Input :
N = 3
Output:
1
Explanation:
1 is the only Perfect Square
less than 3. So, the Output is 1.

You don't need to read input or print anything. Your task is to complete the function countSquares() which takes an Integer N as input and returns the answer.

Expected Time Complexity: O(sqrt(N))
Expected Auxiliary Space: O(1)

Constraints:
1 <= N <= 108

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