normalize_prefix.cpp

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/*
    normalize prefix
*/
#include <string>
#include <set>
#include <iostream>
#include <memory.h>
 
typedef unsigned char uint8;
 
std::string normalize(const std::string& line)
{
    static const char tbl[][3] = { "66", "67", "F2", "F3" };
    size_t tblNum = sizeof(tbl) / sizeof(tbl[0]);
    typedef std::set<std::string> StringSet;
    StringSet suf;
 
    size_t pos = 0;
    for (; pos < line.size(); pos += 2) {
        bool found = false;
        for (size_t i = 0; i < tblNum; i++) {
            if (::memcmp(&line[pos], tbl[i], 2) == 0) {
                found = true;
                suf.insert(tbl[i]);
                break;
            }
        }
        if (!found) break;
    }
    std::string ret;
    for (StringSet::const_iterator i = suf.begin(), e = suf.end(); i != e; ++i) {
        ret += *i;
    }
    ret += &line[pos];
    return ret;
}
 
int main()
{
    std::string line;
    while (std::getline(std::cin, line)) {
        std::string normalizedLine = normalize(line);
        std::cout << normalizedLine << '\n';//std::endl;
    }
}