Help us understand the problem. What is going on with this article?

第8回オフラインリアルタイムどう書くの参考問題の回答例。C++で。

More than 5 years have passed since last update.

すでに第9回の参考問題が出題されているという見事な周回遅れですが。
お題はこちら http://qiita.com/items/24b9be4ee3bae4c89a95

#include <iostream>
#include <sstream>
#include <string>

static const std::string NIBBLES[] =
{
    "0000", "1000", "0100", "1100", "0010", "1010", "0110", "1110",
    "0001", "1001", "0101", "1101", "0011", "1011", "0111", "1111"
};

static const std::string HEXES = "0123456789abcdef";

std::string solve(const std::string& input)
{
    std::string bits;
    for(std::string::const_iterator i = input.begin(); i != input.end(); ++i)
    {
        bits += NIBBLES[HEXES.find(*i)];
    }

    std::string::size_type pos = 0;
    std::string            result;
    for(;;)
    {
        if     (bits.size() <= pos)               { pos = std::string::npos; break; }
        else if(bits.substr(pos, 3) == "000"    ) { result += 't'; pos += 3; }
        else if(bits.substr(pos, 4) == "0010"   ) { result += 's'; pos += 4; }
        else if(bits.substr(pos, 4) == "0011"   ) { result += 'n'; pos += 4; }
        else if(bits.substr(pos, 4) == "0100"   ) { result += 'i'; pos += 4; }
        else if(bits.substr(pos, 5) == "01010"  ) { result += 'd'; pos += 5; }
        else if(bits.substr(pos, 7) == "0101101") { result += 'c'; pos += 7; }
        else if(bits.substr(pos, 6) == "010111" ) { result += 'l'; pos += 6; }
        else if(bits.substr(pos, 4) == "0110"   ) { result += 'o'; pos += 4; }
        else if(bits.substr(pos, 4) == "0111"   ) { result += 'a'; pos += 4; }
        else if(bits.substr(pos, 2) == "10"     ) { result += 'e'; pos += 2; }
        else if(bits.substr(pos, 4) == "1100"   ) { result += 'r'; pos += 4; }
        else if(bits.substr(pos, 4) == "1101"   ) { result += 'h'; pos += 4; }
        else if(bits.substr(pos, 3) == "111"    ) { pos += 3; break; }
        else                                      { pos = std::string::npos; break; }
    }

    if(pos != std::string::npos)
    {
        std::ostringstream output;
        output << result << ":" << pos;
        return output.str();
    }
    else
    {
        return "*invalid*";
    }
}

void test(const std::string& input, const std::string& expected)
{
    std::string actual = solve(input);
    std::cout << actual << " => " << (actual == expected ? "o" : "x") << "¥n";
}

int main(int, char* [])
{
    /*0*/ test( "16d9d4fbd", "ethanol:30" );
    /*1*/ test( "df", "e:5" );
    /*2*/ test( "ad7", "c:10" );
    /*3*/ test( "870dcb", "t:6" );
    /*4*/ test( "880f63d", "test:15" );
    /*5*/ test( "a57cbe56", "cat:17" );
    /*6*/ test( "36abef2", "roll:23" );
    /*7*/ test( "ad576cd8", "chant:25" );
    /*8*/ test( "3e2a3db4fb9", "rails:25" );
    /*9*/ test( "51aa3b4c2", "eeeteee:18" );
    /*10*/ test( "ad5f1a07affe", "charset:31" );
    /*11*/ test( "4ab8a86d7afb0f", "slideshare:42" );
    /*12*/ test( "ac4b0b9faef", "doctor:30" );
    /*13*/ test( "cafebabe", "nlh:17" );
    /*14*/ test( "43e7", "sra:15" );
    /*15*/ test( "53e7", "eera:15" );
    /*16*/ test( "86cf", "tera:16" );
    /*17*/ test( "b6cf", "hon:15" );
    /*18*/ test( "0", "*invalid*" );
    /*19*/ test( "c", "*invalid*" );
    /*20*/ test( "d", "*invalid*" );
    /*21*/ test( "e", "*invalid*" );
    /*22*/ test( "babecafe", "*invalid*" );
    /*23*/ test( "8d", "*invalid*" );
    /*24*/ test( "ad", "*invalid*" );
    /*25*/ test( "af", "*invalid*" );
    /*26*/ test( "ab6e0", "*invalid*" );
    /*27*/ test( "a4371", "*invalid*" );
    /*28*/ test( "a4371", "*invalid*" );
    /*29*/ test( "96e3", "*invalid*" );
    /*30*/ test( "0dc71", "*invalid*" );
    /*31*/ test( "2a9f51", "*invalid*" );
    /*32*/ test( "a43fb2", "*invalid*" );
    /*33*/ test( "ab6e75", "*invalid*" );
    /*34*/ test( "a5dcfa", "*invalid*" );
    /*35*/ test( "ca97", "*invalid*" );
    /*36*/ test( "6822dcb", "*invalid*" );

    return 0;
}
emattsan
ソフトウェアエンジニア、言語オタク
http://d.hatena.ne.jp/E_Mattsan/
esm
We build applications which work well and make customers happy.
http://www.esm.co.jp
Why not register and get more from Qiita?
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
Comments
No comments
Sign up for free and join this conversation.
If you already have a Qiita account
Why do not you register as a user and use Qiita more conveniently?
You need to log in to use this function. Qiita can be used more conveniently after logging in.
You seem to be reading articles frequently this month. Qiita can be used more conveniently after logging in.
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
ユーザーは見つかりませんでした