Given an integer N, count the numbers having an odd number of factors from 1 to N (inclusive).
Example 1:
Input:
N = 5
Output:
2
Explanation:
From 1 - 5 only 2 numbers,
1 and 4 are having odd number
of factors.
Example 2:
Input:
N = 1
Output:
1
Explanation:
1 have only 1(odd)
factor
Your Task:
You don't need to read input or print anything. Your task is to complete the function count() which takes an integer N as input parameters and returns an integer, the total count of numbers from 1 to N having an odd number of factors.
Expected Time Complexity: O(sqrt(N)) Expected Space Complexity: O(1)
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Avoid using static/global variables in coding problems as your code is tested
against multiple test cases and these tend to retain their previous values.
Passing the Sample/Custom Test cases in coding problems does not guarantee the
correctness of code. On submission, your code is tested against multiple test cases
consisting of all possible corner cases and stress constraints.
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