Watch 10 video solutions for Find the Count of Numbers Which Are Not Special, a medium level problem involving Array, Math, Number Theory. This walkthrough by NeetCode has 384,140 views views. Want to try solving it yourself? Practice on FleetCode or read the detailed text solution.
You are given 2 positive integers l and r. For any number x, all positive divisors of x except x are called the proper divisors of x.
A number is called special if it has exactly 2 proper divisors. For example:
Return the count of numbers in the range [l, r] that are not special.
Example 1:
Input: l = 5, r = 7
Output: 3
Explanation:
There are no special numbers in the range [5, 7].
Example 2:
Input: l = 4, r = 16
Output: 11
Explanation:
The special numbers in the range [4, 16] are 4 and 9.
Constraints:
1 <= l <= r <= 109