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172. Factorial Trailing Zeroes (計算n的階乘尾部有多少個零)

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

Note: Your solution should be in logarithmic time complexity.

public class Solution {
    public int trailingZeroes(int n) {
        int res = 0;
        while(n>0){
            res+=n/5;
            n/=5;
        }return res;
    }
}