题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1013反思：思路很简单，但是注意各位数加起来等于10的情况以及输入0的时候结束程序该怎么去表达#include<stdio.h>
#include<string.h>
char a[1000000];
int main()
{ int i; int sum=0;while(gets(a)&&a[0]!=‘0‘){sum=0;for(i=0;a[i]!=‘\0‘;i++)sum+=a[i]-‘0‘;while(sum>=10){sum=sum/10+sum%10;}printf("%d\n",sum);}
}
原文：http://www.cnblogs.com/wuyuewoniu/p...
支持的算法有 ： SHA1withDSA 224 , 256 , 384, 512 publicabstractclass DSACoderSignature {privatestaticfinal String PRIVATE_KEY = "RSAPrivate_Key";privatestaticfinal String PUBLIC_KEY = "RSAPublic_key";privatestaticfinalint KEY_SIZE = 1024;privatestaticfinal String KEY_ALGORITHM = "DSA";privatestaticfinal String SIGNATURE_ALGORITHM = "SHA1withDSA";publicstaticbyte[] getprivateKey(Map<String, Object...
平时上网时，经常会遇到诸如“https访问错误”、“证书错误”等问题， 有没有想过这其中到底涉及什么概念，以下几篇文章，作者觉得写得比较好What is a Digital Signature?数字签名是什么？图解HTTPS讲的非常清楚，仔细看看就应该明白了。原文：http://blog.csdn.net/u013050857/article/details/46863395
求A，B，C ∈[1，N] && A*B != C，d(A*B) == d(C)的组数。首先要知道d(x) = (x%9 == 0 ? 9 : x%9);那么则会有A*B == C，则必有d(A*B) == d(C)。若不考虑A*B != C，则答案既是ans[x]*ans[y]*ans[d(x*y)]，ans[x]为d(i) == x的个数，显然x∈[1，9]。当考虑A*B != C时，则需要从ans[x]*ans[y]*ans[d(x*y)] - sum。sum = sigma(n/i) , i ∈[1，n]。int main()
{int n,i,j,tmp;scanf("%d",&n);LL anw = 0;for(i = 1;i <= n; ++i){ans[(t...
Problem DescriptionThe digital root of a positive integer is found by summing the digits of the integer. If the resulting value is a single digit then that digit is the digital root. If the resulting value contains two or more digits, those digits are summed and the process is repeated. This is continued as long as necessary to obtain a single digit.For example, consider the positive integer 24. ...
DDN（Digital Data Network，数字数据网）是一种利用光纤、数字微波或卫星等数字传输通道和数字交叉复用设备组成的数字数据传输网。它可以为用户提供各种速率的高质量数字专用电
数字数据网(ddn
数字数据网(ddn
路和其他新业务，以满足用户多媒体通信和组建中高速计算机通信网的需要。
数字数据网主要由六个部分组成：光纤或数字微波通信系统；智能节点或集线器设备；网络管理系统；数据电路终端设备；用户环路；用户端计算机或终端...
Digital RootsTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 78669 Accepted Submission(s): 24590Problem DescriptionThe digital root of a positive integer is found by summing the digits of the integer. If the resulting value is a single digit then that digit is the digital root. If the resulting value contains two or more digits, those digi...
hdu 1163 Eddy‘s digital Roots
Problem Description
The digital root of a positive integer is found by summing the digits of the integer. If the resulting value is a single digit then that digit is the digital root. If the resulting value contains two or more digits, those digits are summed and the process isrepeated. This is continued as long as necessary to obtain a single digit.
For example, con...
原题链接https://codeforces.com/problemset/problem/10/C这是一道不错的数论题题意：
定义函数\(d(x)\)为\(x\)的数字根，即若\(x≤9\)，则\(d(x)=x\)；否则\(d(x)=d(s(x))\)，其中\(s(x)\)为\(x\)的各位数之和问存在多少三元组\((A,B,C)\)满足\(A,B,C∈[1,N]\)，\(d(C)=d(d(A)d(B))\)但\(C≠AB\)思路：首先就是对于\(i∈[1,N]\)如何计算\(d(x)\)，当然可以用最粗暴的方法，取每一个数位，然后判断，一直到小于9为止。但如果能看出...
关于digital root可以参考维基百科，这里给出基本定义和性质。一、定义 数字根（Digital Root）就是把一个数的各位数字相加，再将所得数的各位数字相加，直到所得数为一位数字为止。而这个一位数便是原来数字的数字根。适用范围为正整数和零。例如：65536，6+5+5+3+6=25,2+5=7，故数根为7。二、性质 1. 任何数加减9的数字根还是它本身。 2. 9乘任何数字的数字根都是9。 3. 数字根的三则运算 (1). 两数之和的数字...
problemA Digital Library contains millions of books, stored according to their titles, authors, key words of their abstracts, publishers, and published years. Each book is assigned an unique 7-digit number as its ID. Given any query from a reader, you are supposed to output the resulting books, sorted in increasing order of their ID‘s.Input Specification:Each input file contains one test case. Fo...
ReviewCCD：高端天文学，敏感度高，速度慢，成本高；CMOS：普遍使用，嵌入手机，速度快，有模式噪声（Pattern Noise，现在可以解决）；空间分辨率和时间分辨率；图像插值；数字剪影：造影剂+图像减法；图像光照修正：图像除法；图像几何变换：刚体、仿射、射影、分布式；线性算子；锥状细胞：光线充足；杆状细胞：黑暗；颜色组合：加性原色：显示器；减性原色：打印机；两种原色组合方式应用的场景不一样；RGB模型：加性模型；CMYK...
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/*Digital Roots
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 58506 Accepted Submission(s): 18275
Problem Description
The digital root of a positive integer is found by summing the digits of the integer. If the resulting value is a single digit then that digit is the digital root. If the resulting value contains two or more digits, t...
Eddy‘s digital RootsTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 5113 Accepted Submission(s):
2851Problem DescriptionThe digital root of a positive integer is found by
summing the digits of the integer. If the resulting value is a single digit then
that digit is the digital root. If the resulting value contains two or more
digits, ...
我已经尝试部署了2天,即使我阅读了许多文章,StackOverflow问题和Digital Ocean Tutorials,似乎也无法使它正常工作.
我的主要教程是这个：https://www.digitalocean.com/community/tutorials/how-to-set-up-django-with-postgres-nginx-and-gunicorn-on-ubuntu-16-04?comment=47694#create-and-configure-a-new-django-project
当我绑定我的gunicorn文件(请参见下面的命令)并转到my_ip_address：8001时,一切正常gunicorn --bind 0.0...
