IMPA/p10260/p10260.cpp

#include <iostream>
#include <string>
#include <map>

using namespace std;

int main()
{
    map<char, int> soundex;
    string word;

    soundex['B'] = 1;
    soundex['F'] = 1;
    soundex['P'] = 1;
    soundex['V'] = 1;
    soundex['C'] = 2;
    soundex['G'] = 2;
    soundex['J'] = 2;
    soundex['K'] = 2;
    soundex['Q'] = 2;
    soundex['S'] = 2;
    soundex['X'] = 2;
    soundex['Z'] = 2;
    soundex['D'] = 3;
    soundex['T'] = 3;
    soundex['L'] = 4;
    soundex['M'] = 5;
    soundex['N'] = 5;
    soundex['R'] = 6;

    while(cin >> word)
    {
        char last = 0;

        for(char c : word)
        {
            if(soundex.find(c) != soundex.end())
            {
                if(last != soundex[c])
                {
                    cout << soundex[c];
                }
                last = soundex[c];
            }
            else
            {
                last = 0;
            }
        }
        cout << endl;
    }

    return 0;
}