Given a natural number N, find the count of numbers from 1 to N that have an odd number of divisors.
Example 1:
Input:N = 1Output:1Explanation:1 has only one divisor {1}.
Example 2:
Input:N = 4Output:2Explanation:4 has an odd number of divisors {1, 2, 4}.
Your Task:
You don't need to read input or print anything. Your task is to complete the function oddNumberOfDivisor() which takes an integer N and returns the count of numbers from 1 to n that have an odd number of divisors.
Expected Time Complexity: O(N) Expected Auxiliary Space: 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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