归档 2014

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 ...

题目描述：

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

Note: Your solution should be in polynomial time complexity.

题目大意：

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。

解题思路：

参考博文：http://www.geeksforgeeks.org/count-trailing-zeroes-factorial-number/

朴素解法：

首先求出n!，然后计算末尾0的个数。（重复÷10 ...

题目描述：

Related to question Excel Sheet Column Title

Given a column title as appear in an Excel sheet, return its corresponding column number.

For example:

    A -> 1
    B -> 2
    C -> 3
    ...
    Z -> 26
    AA -> 27 ...

明天就是圣诞节，分享一个好玩的jQuery插件——JQuery-Snowfall Plugin，该插件可以实现在页面上飘落雪花的特效。

JQuery-Snowfall插件的github项目地址：https://github.com/loktar00/JQuery-Snowfall/

调用插件的方式很简单，首先，需要在页面上添加对js源文件snowfall.jquery.js的引用：

<script type="text/javascript" src="https://raw.githubusercontent.com/loktar00/JQuery-Snowfall/master/src/snowfall.jquery.js"></script>

然后使用插件的缺省方式开启雪花特效：

$(document).snowfall();

此外，该插件还支持下列参数设置：

flakeCount,
flakeColor ...

题目描述：

Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times.

You may assume that the array is non-empty and the majority element always exist ...