Count Odd Factors
Easy Accuracy: 25.83% Submissions: 62 Points: 2

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)

 

Constraints:
0 <= N <= 109

to report an issue on this page.

Editorial

We strongly recommend solving this problem on your own before viewing its editorial. Do you still want to view the editorial?

Yes

All Submissions

My Submissions:

Login to access your submissions.