An answer of http://nabetani.sakura.ne.jp/hena/ord29devdice/

yhpg.cpp

#include <string>
#include <vector>
#include <iostream>
#include <algorithm>
#include <boost/range/algorithm_ext/erase.hpp>

bool is_remove_string(const std::string &s) 
{
    const std::string not_remove_string = "wxyz/";
    return not_remove_string.find(s) == std::string::npos;
}

std::string join(const std::vector<std::string> &v, const std::string &separator)
{
    std::vector<std::string> res;
    std::transform(v.begin(), v.end(), std::back_inserter(res),
            [&](const std::string &s) { return res.size() + 1 == v.size() ? s : s + separator; }); 
    return std::accumulate(res.begin(), res.end(), std::string(""));
}

std::string get_result_string(const std::string &src, const std::vector<std::string> &v) 
{
    if(v.empty()) {
        return "none";
    }   

    if(2 <= v.size()) {
        return "many";
    }   

    const std::string wxyz = "wxyz";
    const std::string s = v[0];
    std::vector<std::string> result_string;
    for(size_t i = 0; i < src.length(); ++i) {
        const std::string chr = src.substr(i, 1); 
        if(wxyz.find(chr) != std::string::npos) {
            result_string.push_back(join({chr, s.substr(i, 1)}, "="));
        }   
    }   
    return join(result_string, ",");
}

std::string solve(const std::string &src)
{
    std::vector<std::string> patterns = { 
        "12S/453", "146/53D", "15S/3D4", "1T6/D45",
        "215/T64", "2S5/41T", "354/S21", "3D4/15S",
        "41T/2S5", "453/12S", "46T/512", "4D3/S51",
        "512/46T", "53D/146", "54D/6T1", "5S2/T14",
        "641/D35", "6T1/54D", "D35/641", "D45/1T6",
        "S21/354", "S51/4D3", "T14/5S2", "T64/215",
    };  

    for(size_t i = 0; i < src.length(); ++i) {
        const std::string chr = src.substr(i, 1); 
        boost::remove_erase_if(
                patterns,
                [&](const std::string &s) { return is_remove_string(chr) && s.substr(i, 1) != chr; }); 
    }   

    return get_result_string(src, patterns);
}

void test(const std::string &src, const std::string &expected)
{
    const std::string actual = solve(src);
    std::cout
        << (actual == expected ? "OK" : "***NG***")
        << std::endl;
}

void test_all()
{
    /*0*/ test("Tx4/5yz", "x=1,y=S,z=2");
    /*1*/ test("14S/xyz", "none" );
    // 略
}

int main()
{
    test_all();
    return 0;
}