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? 题目大意: 题目大意: 215 = 32768 并且其各位之和为 is 3 + 2 + 7 + 6 + 8 = 26. 21000 的各位数之和是多少? // (Problem 16)Power digit sum // Completed on Sun, 17 No…

Problem 16 pow(2, 15) = 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26.2的15次方等于32768,而这些数字(3+2+7+6+8)的和为26What is the sum of the digits of the number pow(2, 1000)?2的1000次方的位数之和为多少? import math power = math.pow(2, 1000) sum_of_digits = 0 wi…

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 would be…

终于将LeetCode的免费题刷完了,真是漫长的第一遍啊,估计很多题都忘的差不多了,这次开个题目汇总贴,并附上每道题目的解题连接,方便之后查阅吧~ 477 Total Hamming Distance 44.10% Meidum 475 Heaters  30.20% Easy 474 Ones and Zeroes  34.90% Meidum 473 Matchsticks to Square  31.80% Medium 472 Concatenated Words 29.20% Hard…

There are some Common Bugs in C Programming. Most of the contents are directly from or modified from Prof. Liu Pangfeng's blog. Most credits should go to him. For all the following problems, answer the output message of the code, unless they are spec…

You Can Do Research Too I was recently discussing gatekeeping and the process of getting started in CS research with a close friend. I feel compelled to offer a note. As a practicing academic researcher, I’m personally thrilled by the degree of excit…

wmi的Win32_Battery类实现 其中EstimatedChargeRemaining属性返回剩余电量的百分比,EstimatedRunTime属性返回剩余时间(分钟) 其他属性参考http://msdn2.microsoft.com/en-us/library/aa394074.aspx 我写了一个示范代码返回剩余电量的百分比 首先在引用里添加System.Management 核心代码如下: using System.Management; .... ObjectQuery oq =…

COMBINATORIAL TESTING -Test note of “Essential Software Test Design” 2015-09-06 Content 16.1 Coverage16.2 Combination Strategies16.3 Input Parameter Modeling  16.3.1 Structural Input Parameter Modeling  16.3.2 Functional Input Parameter Modeling16.4…

传送门:http://codeforces.com/problemset/problem/16/C Monitor time limit per test0.5 second memory limit per test64 megabytes Problem Description Reca company makes monitors, the most popular of their models is AB999 with the screen size a × b centimeter…

Problem F Codeforces 16E 这道题是一道数位Dp将鱼的死活列为0两种状态然后找DP关系 •题意:有n(n<=18)条鱼,接下来的n-1天,每天会有一对鱼(a,b)相遇,每天任意一对鱼相遇的概率是相等的,相遇之后,他们其中的一条会吃掉另外一条. •鱼a吃掉鱼b的概率是p,那么鱼b吃掉鱼a的概率就是1-p; •给你一个n*n的矩阵,表示n条鱼中的某对相遇时,互相吃掉对方的概率. •数据保证pij+pji=1; •计算每只鱼最后存活下来的概率. •status{x1,x2,x3,…