private void init(int size, boolean createSquares) {
this.size = size;
this.sizeSqrt = (int) Math.sqrt(size);
this.squares = new Square[size][size];
this.rows = new Group[size];
this.cols = new Group[size];
if (this.sizeSqrt > 1) {
this.groups = new Grid[size];
}
if (createSquares) {
createSquares();
}
}
