Given an integer total_switches representing the number of switches, each initially off, perform total_switches rounds of toggling. In the i-th round, toggle every switch whose position is divisible by i. Return the count of switches that are on after all rounds.
Example 1
Input: total_switches=5
Output: 2
Explanation: Switches at positions 1 and 4 are on after all rounds.
Example 2
Input: total_switches=10
Output: 3
Explanation: Switches at positions 1, 4, and 9 are on after all rounds.
Constraints
Case 1
Input: total_switches=7
Expected: 2
Case 2
Input: total_switches=15
Expected: 3
Case 3
Input: total_switches=20
Expected: 4
Case 4
Input: total_switches=25
Expected: 5