Message Decoding(UVa 213)
来源:互联网 发布:家居装修设计软件 编辑:程序博客网 时间:2024/06/06 03:30
Message Decoding
64-bit integer IO format: %lld Java class name: Main
[PDF Link]
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 AEIOU0010101100011101000100111011001111000$#**\0100000101101100011100101000
Sample Output
TAN ME##*\$
Source
#include<stdio.h>#include<string.h>// <<,>>运算符优先级比+,-低,一定要注意,不然会浪费很多时间检查错误 int readchar()//解决跨行读字符的问题,用于readchar()和readcodes() {char ch = getchar();while(ch=='\n' || ch=='\r') ch = getchar();return ch;}int readint(int c)//读取编码{int num = 0;while(c--){char ch = readchar();//if(ch == EOF) return ch; num = num*2 + ch - '0';}return num;}int code[8][1<<8];int readcodes()//读取编码头{memset(code, 0, sizeof(code)); //清空code数组code[1][0] = readchar(); //直接跳到下一行开始读取,如果输入结束,会读到EOF for(int len=2; len<8; len++){for(int v=0; v<((1<<len)-1); v++){char ch = getchar();if(ch == EOF) return 0;if(ch=='\n' || ch=='\r') return 1;code[len][v] = ch; }}}void printcodes()//测试使用 {for(int i=1; i<8; i++){for(int j=0; j<((1<<i)-1); j++)printf("code[%d][%d] = %c\t", i, j, code[i][j]);printf("\n");}}int main(){while(readcodes()){//printcodes();while(1){int len = readint(3);//printf("len is %d\n", len);if(len == 0) break;while(1){int v = readint(len);if(v == ((1<<len)-1)) break;printf("%c",code[len][v]);}}printf("\n"); }return 0;}
- uva -213Message Decoding
- UVa 213 - Message Decoding
- UVA【213】 Message Decoding
- uva 213 Message Decoding
- UVA-213-Message Decoding
- UVa-213Message Decoding
- UVA - 213 Message Decoding
- Uva - 213 - Message Decoding
- UVA - 213 Message Decoding
- UVA 213 Message Decoding
- UVa 213 Message Decoding
- uva 213 Message Decoding
- UVa 213 Message Decoding
- UVA 213 Message Decoding
- Message Decoding UVa 213
- Uva 213 Message Decoding
- UVa 213 - Message Decoding
- UVa 213 - Message Decoding
- Linux学习(一)基本操作
- 欢迎使用CSDN-markdown编辑器
- 多表查询
- 四十五、一文读懂hadoop、hbase、hive、spark分布式系统架构
- 四十六、利用yarn多队列实现hadoop资源隔离
- Message Decoding(UVa 213)
- Soldier and Number Game--筛素数
- 设计模式之禅笔记--设计原则
- 46. Permutations
- 在Visual Studio中,配置与平台中的x86设置与目标平台中的x64设置的作用
- FileProvider的使用
- 一、涉及知识
- 再踩Python的Shallow Copy
- 47. Permutations II