Yada Number       Time Limit : 2000 MS   Memory Limit : 65536 KB   Yada Number Problem Description: Every positive integer can be expressed by multiplication of prime integers. Duoxida says an integer is a yada number if the total amount of 2,3,5,7,1…

Yada Number Problem Description: Every positive integer can be expressed by multiplication of prime integers. Duoxida says an integer is a yada number if the total amount of 2,3,5,7,11,13 in its prime factors is even. For instance, 18=2 * 3 * 3 is no…

Yada Number Problem Description: Every positive integer can be expressed by multiplication of prime integers. Duoxida says an integer is a yada number if the total amount of 2,3,5,7,11,13 in its prime factors is even. For instance, 18=2 * 3 * 3 is no…

A - Magic Number Time Limit:2000MS     Memory Limit:32768KB     64bit IO Format:%lld & %llu Submit Status Practice ZOJ 3622 Appoint description:   Description A positive number y is called magic number if for every positive integer x it satisfies tha…

Harmonic Number Time Limit:3000MS     Memory Limit:32768KB     64bit IO Format:%lld & %llu Submit Status Practice LightOJ 1234 Description In mathematics, the nth harmonic number is the sum of the reciprocals of the first n natural numbers: In this p…

http://lightoj.com/volume_showproblem.php?problem=1234 Harmonic Number Time Limit:3000MS     Memory Limit:32768KB     64bit IO Format:%lld & %llu Submit Status Practice LightOJ 1234 Description In mathematics, the nth harmonic number is the sum of th…

这道题是LeetCode里的第171道题. 题目描述: 给定一个Excel表格中的列名称,返回其相应的列序号. 例如, A -> 1 B -> 2 C -> 3 ... Z -> 26 AA -> 27 AB -> 28 ... 示例 1: 输入: "A" 输出: 1 示例 2: 输入: "AB" 输出: 28 示例 3: 输入: "ZY" 输出: 701 26进制算法题-- 解题代码: class Solut…

给定一个Excel表格中的列名称,返回其相应的列序号.示例:    A -> 1    B -> 2    C -> 3    ...    Z -> 26    AA -> 27    AB -> 28 详见:https://leetcode.com/problems/excel-sheet-column-number/description/ Java实现: class Solution { public int titleToNumber(String s) {…

一.表不存在时则创建 之前做项目实在是太赶了,很多东西都没记录.是时候补回来了 MySQL做一个大表,由于要存历史记录,所以数据量很大,查询很慢.恰好查询的时候,又不需要时间太久的冷数据.现在将其实现原理提取成一个控制台小程序. 首先,创建一个简单的数据库访问类. public static class CommonDao { private static MySqlConnection conn = new MySqlConnection(ConfigurationManager.AppSet…

1.认识Ext.form.Panel表单面板         Ext.form.field.CheckBox 复选框 checkboxfield Ext.form.CheckBoxGroup 复选框组 checkboxgroup Ext.form.field.ComboBox 下拉列表框 combo Ext.form.field.Date 日期选择框 datefield Ext.form.field.Display 文本展示组件 displayfield Ext.form.FieldContai…