English
172. Factorial Trailing Zeroes
Problem Statement:
Given an integer n
, return the number of trailing zeroes in n!
.
Note that n! = n * (n - 1) * (n - 2) * ... * 3 * 2 * 1
.
Example 1:
Input: n = 3
Output: 0
Explanation: 3! = 6, no trailing zero.
Example 2:
Input: n = 5
Output: 1
Explanation: 5! = 120, one trailing zero.
Example 3:
Input: n = 0
Output: 0
Constraints:
- 0 <= n <= 104
Follow up: Could you write a solution that works in logarithmic time complexity?
Solution:
java
public int trailingZeroes(int n) {
int count = 0;
while (n > 0) {
n /= 5;
count += n;
}
return count;
}
...