public static void main(String[] args) {
SET<String> set = new SET<String>();
// read in strings and add to set
while (!StdIn.isEmpty()) {
String key = StdIn.readString();
if (!set.contains(key)) {
set.add(key);
StdOut.println(key);
}
}
}
// Recursive function to find all words on board from partiular tile
private void recFindAllWordsOnBoard(
String partial,
int row,
int col,
BoggleBoard board,
boolean[][] usedTiles,
Trie dictionary,
SET<String> wordsFound) {
// Base Case 0 (if row or col are out of board):
if (!inBounds(row, col, board)) return;
// Base Case 1 (if tile was already used previously):
if (usedTiles[row][col]) return;
// Go along this path to explore words
char letter = board.getLetter(row, col);
if (letter == 'Q') {
partial += "QU";
} else {
partial += letter;
}
// If the dictionary does not contain partial prefix
// if (!dictionary.keysWithPrefix(partial).iterator().hasNext()) return;
if (!dictionary.containsPrefix(partial)) return;
// Continue exploring
usedTiles[row][col] = true;
if (dictionary.containsWord(partial)
&& !wordsFound.contains(partial)
&& partial.length() >= MIN_WORD_SIZE) {
wordsFound.add(partial);
}
// Explore all 8 directions from current tile
int adjRow = 0;
int adjCol = 0;
for (int direction = 0; direction < NUM_TILE_DIRECTIONS; direction++) {
// Update adjRow and adjCol to all 8 possible directions
switch (direction) {
// North West
case 0:
adjRow = row - 1;
adjCol = col - 1;
break;
// North
case 1:
adjRow = row - 1;
adjCol = col;
break;
// North East
case 2:
adjRow = row - 1;
adjCol = col + 1;
break;
// East
case 3:
adjRow = row;
adjCol = col + 1;
break;
// South East
case 4:
adjRow = row + 1;
adjCol = col + 1;
break;
// South
case 5:
adjRow = row + 1;
adjCol = col;
break;
// South West
case 6:
adjRow = row + 1;
adjCol = col - 1;
break;
// West
case 7:
adjRow = row;
adjCol = col - 1;
break;
default:
break;
}
recFindAllWordsOnBoard(partial, adjRow, adjCol, board, usedTiles, dictionary, wordsFound);
}
// Backtrack step
partial = partial.substring(0, partial.length() - 1);
usedTiles[row][col] = false;
}
// does the set contain point p?
public boolean contains(Point2D p) {
return points.contains(p);
}
// does the set contain point p?
public boolean contains(Point2D p) {
if (p == null) throw new NullPointerException("Point2D cannot be null!");
return set.contains(p);
}
// add the point to the set (if it is not already in the set)
public void insert(Point2D p) {
if (p == null) throw new NullPointerException("Point2D cannot be null!");
if (!set.contains(p)) set.add(p);
}