172. Factorial Trailing Zeroes

https://leetcode.com/problems/factorial-trailing-zeroes/

Given an integer n, return the number of trailing zeroes in n!.

Example 1:

Input: 3
Output: 0
Explanation: 3! = 6, no trailing zero.

Example 2:

Input: 5
Output: 1
Explanation: 5! = 120, one trailing zero.

Note: Your solution should be in logarithmic time complexity.

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Intuition - Count number of 5 factors in n

Time - O( Log N base 5)

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