Update 172. Factorial Trailing Zeroes.cpp

Author: yash-1104github

172. Factorial Trailing Zeroes.cpp

@@ -1,6 +1,7 @@
 class Solution {
 public:
     int trailingZeroes(int n) {
+         // every leading zero is generated by 2*5 and cnt of 5 << cnt of 2;
         int ans = 0;
       while(n / 5 > 0){
             ans += n / 5;