cryptcow

/*
                              c           o     w
"Begin the Escape exeOt the BnCak cutioWofO aCreW Dawn"
unenc(c, o, w)
"Begin the Escape exeOt the Bn aCreak cutioWof Dawn"
RIGHT
...
reenc(c, o, w)
"Begin the Escape CnCak OexeOt the BWcutioWofO aCreW Dawn"
NOT
"Begin the Escape exeOt the BnCak cutioWofO aCreW Dawn"
*/


void unenc(int c, int o, int w) {
    if (next[c] == o) {
        if (next[o] == w) {
            next[prev[c]] = next[w];
            prev[next[w]] = prev[c];
        } else {
            next[prev[c]] = next[o];
            prev[next[o]] = prev[c];

            next[prev[w]] = next[w];
            prev[next[w]] = prev[w];
        }
    } else {
        if (next[o] == w) {
            next[prev[c]] = next[c];
            prev[next[c]] = prev[c];

            next[prev[o]] = next[w];
            prev[next[w]] = prev[o];
        } else {
            next[prev[c]] = next[o];
            prev[next[o]] = prev[c];

            next[prev[w]] = next[c];
            prev[next[c]] = prev[w];

            next[prev[o]] = next[w];
            prev[next[w]] = prev[o];
        }
    }
}

void reenc(int c, int o, int w) {
    next[prev[c]] = c;
    prev[next[c]] = c;

    next[prev[o]] = o;
    prev[next[o]] = o;

    next[prev[w]] = w;
    prev[next[w]] = w;
}