Message Decoding
Some message encoding schemes require that an encoded message be sent in two parts. The first part, called the header, contains the characters of the message. The second part contains a pattern that represents the message. You must write a program that can decode messages under such a scheme.
The heart of the encoding scheme for your program is a sequence of ``key" strings of 0's and 1's as follows:

The first key in the sequence is of length 1, the next 3 are of length 2, the next 7 of length 3, the next 15 of length 4, etc. If two adjacent keys have the same length, the second can be obtained from the first by adding 1 (base 2). Notice that there are no keys in the sequence that consist only of 1's.
The keys are mapped to the characters in the header in order. That is, the first key (0) is mapped to the first character in the header, the second key (00) to the second character in the header, the kth key is mapped to the kth character in the header. For example, suppose the header is:
AB#TANCnrtXc
Then 0 is mapped to A, 00 to B, 01 to #, 10 to T, 000 to A, ..., 110 to X, and 0000 to c.
The encoded message contains only 0's and 1's and possibly carriage returns, which are to be ignored. The message is divided into segments. The first 3 digits of a segment give the binary representation of the length of the keys in the segment. For example, if the first 3 digits are 010, then the remainder of the segment consists of keys of length 2 (00, 01, or 10). The end of the segment is a string of 1's which is the same length as the length of the keys in the segment. So a segment of keys of length 2 is terminated by 11. The entire encoded message is terminated by 000 (which would signify a segment in which the keys have length 0). The message is decoded by translating the keys in the segments one-at-a-time into the header characters to which they have been mapped.
Input
The input file contains several data sets. Each data set consists of a header, which is on a single line by itself, and a message, which may extend over several lines. The length of the header is limited only by the fact that key strings have a maximum length of 7 (111 in binary). If there are multiple copies of a character in a header, then several keys will map to that character. The encoded message contains only 0's and 1's, and it is a legitimate encoding according to the described scheme. That is, the message segments begin with the 3-digit length sequence and end with the appropriate sequence of 1's. The keys in any given segment are all of the same length, and they all correspond to characters in the header. The message is terminated by 000.
Carriage returns may appear anywhere within the message part. They are not to be considered as part of the message.
Output
For each data set, your program must write its decoded message on a separate line. There should not be blank lines between messages.
Sample input
TNM AEIOU
0010101100011
1010001001110110011
11000
$#**\
0100000101101100011100101000
Sample output
TAN ME
##*\$
#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <map>
#include <set>
#include <stack>
#include <queue>
#include <string>
#include <vector>
using namespace std;
const double EXP=1e-;
const double PI=acos(-1.0);
const int INF=0x7fffffff;
const int MS=; char code[][<<];
int readchar()
{
while()
{
int ch=getchar();
if(ch!='\n'&&ch!='\r')
return ch;
}
}
int readint(int cnt)
{
int v=;
while(cnt--)
v=v*+readchar()-'';
return v;
}
int readcode()
{
memset(code,,sizeof(code));
code[][]=readchar(); //特别注意,因为读到长度为0的时候就break了,后面还有个换行符
for(int len=;len<=;len++)
{
for(int i=;i<(<<len)-;i++)
{
int ch=getchar();
if(ch==EOF)
return ;
if(ch=='\n'||ch=='\r')
return ;
code[len][i]=ch;
}
}
return ;
}
int main()
{
while(readcode())
{
//printcode(); for debug
while()
{
int len=readint();
if(len==)
break;
//printf("len=%d\n",len);
while()
{
int v=readint(len);
//printf("v==%d\n",v);
if(v==(<<len)-)
break;
putchar(code[len][v]);
}
}
putchar('\n');
}
return ;
}
Message Decoding的更多相关文章
- UVa 213 Message Decoding(World Finals1991,串)
Message Decoding Some message encoding schemes require that an encoded message be sent in two part ...
- [算法竞赛入门经典]Message Decoding,ACM/ICPC World Finals 1991,UVa213
Description Some message encoding schemes require that an encoded message be sent in two parts. The ...
- 紫书第一章训练1 D -Message Decoding
Some message encoding schemes require that an encoded message be sent in two parts. The first part, c ...
- Message Decoding UVA - 213
Some message encoding schemes require that an encoded message be sent in two parts. The fifirst par ...
- uva 213 Message Decoding
思路来自紫书...开始时的思路估计100行+,果断放弃!关键:1.正确提取出函数! initmap():初始化字母与整数的映射. returnint(x):向后读取x位,并转换为十进制数返回. ...
- UVA - 213 Message Decoding (输入字符串并对单个字符进行操作的输入输出)
POINT: 关于表示一个编码:利用code字符数组表示一个编码字符,其中code[len][val]表示长度为len,二进制值为val的字符: 主程序如下: #include <iostrea ...
- 【每日一题】 UVA - 213 Message Decoding 模拟解码+读入函数+阅读题
题意:阅读理解难度一道比一道难orz.手摸了好久样例 题解: 读入:大循环用getline读入header顺便处理一下, 里面再写两重循环,外层一次读三个串,内层一次读num个串. 之后就查表,线性 ...
- uva 213 - Message Decoding (我认为我的方法要比书上少非常多代码,不保证好……)
#include<stdio.h> #include<math.h> #include<string.h> char s[250]; char a[10][250] ...
- uvaoj 213 - Message Decoding(二进制,输入技巧)
https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem& ...
随机推荐
- [HIve - LanguageManual] Subqueries
Subqueries in the FROM Clause Subqueries in the WHERE Clause Subqueries in the FROM Clause SELECT .. ...
- Unity3D中的Shader
简单的说,Shader是为渲染管线中的特定处理阶段提供算法的一段代码.Shader是伴随着可编程渲染管线出现的,从而可以对渲染过程加以控制. 1. Unity提供了很多内建的Shader,这些可以从官 ...
- Emacs和它的朋友们——阅读源代码篇(转)
正如那本<Code Reading>一书中指出的那样,源代码阅读一直没有被很好的重 视:你上大学的时候有“代码阅读”这门课吗?相信没有. 1 Source Insight 谈到阅读源代码, ...
- ubuntu14.04.03 vsftpd
apt-get install vsftpd /etc/vsftpd.conf配置Example listen=YES anonymous_enable=NO local_enable=YES wri ...
- 国外PHP学习网站书籍资料汇总
这篇文章汇总了全面多样的PHP学习资源,包括书籍.网站.文章等,帮助你提高PHP开发能力,巩固PHP知识.结合上一篇<重磅资料!Github上的PHP资源汇总大全>,一定可以让你的PHP技 ...
- 利用red5搭建一个简单的流媒体直播系统
http://blog.sina.com.cn/s/blog_51396f890102exmz.html 一.red5安装.设置. 这个过程就不多说了,参见http://blog.csdn.net/l ...
- UVALive 7275 Dice Cup (水题)
Dice Cup 题目链接: http://acm.hust.edu.cn/vjudge/contest/127406#problem/D Description In many table-top ...
- Jvm基础(1)-Java运行时数据区
最近在看<深入理解Java虚拟机>,里面讲到了Java运行时数据区,这是Jvm基本知识,把读书笔记记录在此.这些知识属于常识,都能查到的,如果我有理解不对的地方,还请指出. 首先把图贴上来 ...
- [转]省市二级联动(纯js实现)
转至:http://www.jb51.net/article/41556.htm 实现原理: set_city("省名称",市select对象); 判断市select对象是否为空, ...
- 允许ubuntu下mysql远程连接
第一步: gedit /etc/mysql/my.cnf找到bind-address = 127.0.0.1 注释掉这行,如:#bind-address = 127.0.0.1 或者改为: bind- ...