void Dictionary::recursiveInteractive(Words const& active_words) const
{
if (active_words.empty()) {
puts("No choices remain.\n");
} else if (active_words.size() == 1) {
fputs("Only choice remaining is: ", stdout);
describeWord(stdout, active_words.front());
puts("\n");
} else {
printf("%u choices remain", static_cast<unsigned>(active_words.size()));
if (active_words.size() <= 5) {
// If we're near the end, print a list
fputs(": ", stdout);
auto it = active_words.cbegin();
describeWord(stdout, *it);
do {
fputs(", ", stdout);
describeWord(stdout, *it);
} while (++it != active_words.cend());
putchar('\n');
} else {
puts(".");
}
putchar('\n');
string cmd;
for (;;) {
printInteractiveSuggestions(active_words);
fputs("Give your move in form \"<word> <result>\" like \"TAXI 2\"\n\n"
"> ", stdout);
fflush(stdout);
if (!read_uppercase_word(stdin, &cmd))
break; // EOF
Word tried;
unsigned matched;
if (parse_move(cmd, wordLength(), &tried, &matched)) {
DividedWordList dl(wordLength());
dl.build(*this, active_words, tried);
recursiveInteractive(dl[matched].choices());
break;
}
puts("Invalid move.\n");
}
}
}
void Dictionary::recursiveSolve(AbstractSolutionAcceptor * const acceptor, Words const& active_words, AnswerSequence * const runningAnswersp) const
{
assert(!active_words.empty());
if (active_words.size() == 1) { // We found an end node
acceptor->acceptSolution(*runningAnswersp, active_words.front());
} else {
DividedWordList dl(wordLength());
double best_entropy = -1.0;
Word best_word = 0;
// Of all of the words in active_words, find the one that
// will gives us the most even split (and thus the highest entropy)
{
auto it = keys_.cbegin();
do {
dl.build(*this, active_words, *it);
double const entropy = dl.entropy();
if (entropy > best_entropy) {
best_entropy = entropy;
best_word = *it;
}
} while (++it != keys_.cend());
}
assert(popcount32(best_word) == wordLength());
// Now that we have found our best word, recompute the split
dl.build(*this, active_words, best_word);
assert(dl.entropy() == best_entropy);
acceptor->acceptBranch(*runningAnswersp, best_word, best_entropy, dl);
// Now recursively descend
for (unsigned i = 0; i < wordLength() + 1; i++) {
const WordsWithTotalChoices& wwtc = dl[i];
if (wwtc.count() > 0) {
runningAnswersp->push_back(i);
recursiveSolve(acceptor, wwtc.choices(), runningAnswersp);
runningAnswersp->pop_back();
}
}
}
}