题目描述:
Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST.
Calling next() will return the next smallest number in the BST.
Note: next() and hasNext() should run in ...
Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST.
Calling next() will return the next smallest number in the BST.
Note: next() and hasNext() should run in ...
Given an integer n, return the number of trailing zeroes in n!.
Note: Your solution should be in polynomial time complexity.
给定一个整数n,返回n!(n的阶乘)数字中的后缀0的个数。
注意:你的解法应该满足多项式时间复杂度。
参考博文:http://www.geeksforgeeks.org/count-trailing-zeroes-factorial-number/
首先求出n!,然后计算末尾0的个数。(重复÷10 ...