@Override
public int compareTo(Grid o) {
return (int) (o.compute() - this.compute());
}
public SortedSet<Grid> children() {
SortedSet<Grid> children = new TreeSet<Grid>();
Grid gridA, gridB;
int t = 0;
gridA = new Grid(this);
for (int i = 0; i < 4; i++) {
while (gridA.moveRight()) {
t++;
gridB = new Grid(gridA);
while (gridB.moveDown()) gridB.down++;
gridB.rotations = i;
gridB.translations = t;
children.add(gridB);
}
while (gridA.moveLeft()) {
t--;
gridB = new Grid(gridA);
while (gridB.moveDown()) gridB.down++;
gridB.rotations = i;
gridB.translations = t;
children.add(gridB);
}
gridA.turnClockwise();
}
return children;
}