[Project Euler] Problem 19

You are given the following information, but you may prefer to do some research for yourself. 1 Jan 1900 was a Monday. Thirty days has September,April, June and November.All the rest have thirty-one,Saving February alone,Which has twenty-eight,

[Project Euler] Problem 20

n! means n (n 1) ... 3 2 1 For example, 10! = 10 9 ... 3 2 1 = 3628800,and the sum of the digits in the number 10! is 3 + 6 + 2 + 8 + 8 + 0 + 0 = 27. Find the sum of the digits in the number 100!  這個對於python來說實在太小兒科了。一句話的事:print sum(int(x)

[Project Euler] Problem 21

Let d(n) be defined as the sum of proper divisors of n (numbers less than n which divide evenly into n).If d(a) = b and d(b) = a, where a b, then a and b are an amicable pair and each of a and b are called amicable numbers. For example, the proper

[Project Euler]Problem 28

Starting with the number 1 and moving to the right in a clockwise direction a 5 by 5 spiral is formed as follows: 21 22 23 24 2520 7 8 9 1019 6 1 2 1118 5 4 3 1217 16 15 14 13 It can be verified that the sum of the numbers on the diagonals is 101.

[讀書筆記]資料字典

這是一個關於資料字典使用的例子 using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace DictionaryExample{ public struct EmployeeId : IEquatable<EmployeeId> { private readonly char prefix; private

[Project Euler]加入歐拉 Problem 9

A Pythagorean triplet is a set of three natural numbers, a b c, for which, a2 + b2 = c2For example, 32 + 42 = 9 + 16 = 25 = 52. There exists exactly one Pythagorean triplet for which a + b + c = 1000.Find the product abc.   意思很明白找出這樣的a, b, ca+b+c = 1

【讀書筆記】從接收器的角度討論事件

  在系統事件中,例如按一下滑鼠或者鍵盤按鍵,發送器就是.NET運行庫。 為什麼要使用委託? 在事件接收器的某個地方有一個方法,它負責處理事件。在每次發生登入的事件時,就執行這個事件處理常式。此時就需要使用委託了。由於發送器對接收器一無所知,所以無法設定兩者事件的參考型別,而是使用委託作為中介。 例子來說明問題: 建立一個windows form application程式,加入一個buttonOne的按鈕控制項和一個labelInfo的label控制項。

[Project Euler]加入歐拉 Problem 10

The sum of the primes below 10 is 2 + 3 + 5 + 7 = 17. Find the sum of all the primes below two million. 找出小於2,000,000裡面的質數然後求和。  不用什麼好辦法,2000000,這個數不算太大,直接求解。在能節省空間的和時間的地方盡量節省。比如可以使用unsigned long, 就不要使用double。可以使用%

[Project Euler]加入歐拉 Problem 11

In the 20×20 grid below, four numbers along a diagonal line have been marked in red. 08 02 22 97 38 15 00 40 00 75 04 05 07 78 52 12 50 77 91 0849 49 99 40 17 81 18 57 60 87 17 40 98 43 69 48 04 56 62 0081 49 31 73 55 79 14 29 93 71 40 67 53 88 30 0

[Project Euler]加入歐拉 Problem 12

文章目錄 整數分解 The sequence of triangle numbers is generated by adding the natural numbers. So the 7^(th) triangle number would be 1 + 2 + 3 + 4 + 5 + 6 + 7 = 28. The first ten terms would be: 1, 3, 6, 10, 15, 21, 28, 36, 45,

還是這個序列化的解釋比較好懂

序列化(Serialization)是.NET平台最酷的特性之一。1、為什麼要序列化:首先你應該明白系列化的目的就不難理解他了。系列化的目的就是能在網路上傳輸對象,否則就無法實現物件導向的分散式運算。比如你的用戶端要調用伺服器上的一個方法獲得一個產品對象,比如方法為:public   Product   findProduct(int   product_id);    

[Project Euler]加入歐拉 Problem 13 被卡住了,調試不出正確結果囧

Work out the first ten digits of the sum of the following one-hundred 50-digit numbers. 371072875339021027987979982208375902465101357402504637693767749000971264812489697007805041701826053874324986199524741059474233309513058123726617309629919422133635

[Project Euler]加入歐拉 Problem 14

The following iterative sequence is defined for the set of positive integers: n n/2 (n is even)n 3n + 1 (n is odd) Using the rule above and starting with 13, we generate the following sequence: 13 40 20 10 5 16 8 4 2 1 It can be seen that

關於投資基金我的想法

  第一,核心+衛星的投資這個觀念還是很不錯的。我建議是2個核心+4個衛星的組合。比例在初期的資本構成中核心基金應該不少於總投資的60%。看到了樓主的核心投資應該是在華夏300和嘉實主題上。華夏300我不建議做核心基金,畢竟風險有些高,如果是碰到股市不好的情況,會很慘。核心基金,盡量選晨星5星,長期表現不錯的基金。任何時候都可以靠的住。 第二,資本構建時間點。如果基金選定了,這樣就需要在一個點切入。這個點對於核心基金相對重要。我的建議是在股市的相對低點,分批買入。不要一次性買入太多,除非是當年的

[Project Euler]歐拉 Problem 13 回答上次的問題

在前面的一篇文章裡,文章連結地址:http://http://www.cnblogs.com/herbert/archive/2011/01/31/1948181.html 我寫了下面這段代碼來解決Problem 13。結果一直沒有得出答案,今天過完節了,回來看了下,呵呵終於找出問題所在了。歐拉項目第十三題原解答#include <stdio.h>#include <stdlib.h>#include <assert.h>#include

[Project Euler]加入歐拉 Problem 15

Starting in the top left corner of a 22 grid, there are 6 routes (without backtracking) to the bottom right corner. How many routes are there through a 2020 grid?   從 2*2的一個角到達另外一個對角有6條線路,問從 20*20的一個角到達另外一個對角有多少條線路?   這個要是運用組合數學的知識就好解決了。下面是組合數學的一個東東:

你會刷牙嗎?圖解正確刷牙方法

“飯後漱口,早晚刷牙”這個有利於口腔衛生的好習慣相信不少人已經有了,但有許多人仍會問,為什麼我的牙齦還常流血,為什麼還有口臭?為什麼齲齒還是得不到控制?這多半與沒有掌握正確的刷牙方法有關。有關專家指出,我國城市中90%的人達不到有效刷牙,很大程度上是人們缺乏足夠的口腔保健知識所致。這多少讓人有些吃驚吧?原來自己在“瞎刷”。  刷牙的五大誤區。  誤區一:使用大頭牙刷,用力橫刷。  有人習慣使用毛束密集的大頭牙刷,用力橫向拉鋸式刷牙,以為這樣可以提高效率和清潔程度。殊不知,正是這些粗、硬、密的毛束

[Project Euler]加入歐拉 Problem 16

215 = 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26. What is the sum of the digits of the number 21000? 計算 2 的 1000次方的所有數位和?這個設計大數乘方問題,我自己寫了一個計算大數乘方的函數來計算。先來說下如何計算大數乘方的問題吧,通用的思路就是採用數組來分段處理大數,分段表示大數。(使用鏈表的話,其實也會更簡單,更省空間的)下面的演算法中,我採用的是“萬進位”

[Project Euler]加入歐拉 Problem 17

If the numbers 1 to 5 are written out in words: one, two, three, four, five, then there are 3 + 3 + 5 + 4 + 4 = 19 letters used in total. If all the numbers from 1 to 1000 (one thousand) inclusive were written out in words, how many letters

[Project Euler] Problem 18 & Problem 67

By starting at the top of the triangle below and moving to adjacent numbers on the row below, the maximum total from top to bottom is 23.37 42 4 68 5 9 3That is, 3 + 7 + 4 + 9 = 23.Find the maximum total from top to bottom of the triangle below:7595

總頁數: 61357 1 .... 6649 6650 6651 6652 6653 .... 61357 Go to: 前往

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