Uva 1590 IP Networks】的更多相关文章

习题4-5 IP网络(IP Networks, ACM/ICPC NEERC 2005, UVa1590) 可以用一个网络地址和一个子网掩码描述一个子网(即连续的IP地址范围).其中子网 掩码包含32个二进制位,前32-n位为1,后n位为0,网络地址的前32-n位任意,后n位为0. 所有前32-n位和网络地址相同的IP都属于此网络. 例如,网络地址为194.85.160.176(二进制为11000010|01010101|10100000|10110000), 子网掩码为255.255.255.…
题意:输入m代表接下来的数据个数,计算接下来输入数据的网络掩码,和最小网络地址. 思路:①子网掩码:先将数据转为二进制,判断从哪一位开始有数据不一样,记下下标index,则子网掩码是index的前面是1,后面是0(2#),就是子网掩码,再转为10#输出: ②最小网络地址:用任意一个IP与子网掩码进行按位与运算得出最小IP,与运算的符号为&. import java.util.Scanner; public class UVA1590 { public static void main(Strin…
这道题目是一道关于IP地址的题目,要深入理解这道题需要有一定的网络基础. 这道题目我第一次做的时候虽然也AC了,但代码写的比较复杂,不够精炼.近期刚刚参加了网络方面的培训,在有一定知识的基础上,又重写了这道题目.将很多步骤通过位运算(如移位,异或)进行了简化,在此贴一下前后两次的代码. 第二次代码: #include <cstdio> + ; ]; int find_firstdiff(int m){ ;i<;i++) ;j<m;j++) ][i])return i; ; } vo…
Description   Alex is administrator of IP networks. His clients have a bunch of individual IP addresses and he decided to group all those IP addresses into the smallest possible IP network. Each IP address is a 4-byte number that is written byte-by-b…
 Alex is administrator of IP networks. His clients have a bunch of individual IP addresses and he decided to group all those IP addresses into the smallest possible IP network.  Each IP address is a 4-byte number that is written byte-by-byte in a dec…
逻辑运算 规则 符号 与 只有1 and 1 = 1,其他均为0 & 或 只有0 or 0 = 0,其他均为1 | 非 也就是取反 ~ 异或 相异为1相同为0 ^ 同或 相同为1相异为0,c中没有,但可以异或后取反 无 左移 各二进位全部左移若干位,高位丢弃,低位补0 << 右移 各二进位全部右移若干位,对无符号数,高位补0,有符号数,有的补符号位(算术右移),有的补0(逻辑右移) >> 光这么说可能比较抽象,我们通过两道题开看这个知识点. Uva 1590 题目链接 简单…
书上具体所有题目:http://pan.baidu.com/s/1hssH0KO 代码:(Accepted,0 ms) //UVa1590 - IP Networks #include<iostream> unsigned i, m, num, ip[4], ipmax[4], ipmin[4], mask[4]; int cmp(unsigned *a, unsigned *b) {//compare for (int i = 0;i < 4;++i) { if (a[i] <…
How endless looping of packets in a TCP/IP network might occur? Router is a device used to interconnect two or more computer networks and routing is the process of properly, forwarding traffic between related computer networks. Endless looping of pac…
https://en.wikipedia.org/wiki/Network_address_translation In the face of the foreseeable global IP address space exhaustion, NAT was increasingly used since the late 1990s in conjunction with IP masquerading, which is a technique that hides an entire…
http://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=1194 不看解析还真没有什么思路,刘汝佳的<算法竞赛入门经典训练指南>P117 将原问题转换成树 然后再进行树型DP 代码: #include <iostream> #include <cstdio> #include <string> #inc…