public void searchCluster(Grid grid){
    Node[][] array = grid.getNodeArray();
    ArrayList<Node> tmpBurnt = new ArrayList();
    LinkedList<Node> tmpSave = new LinkedList();
    Node left;
    Node right;
    Node below;

    for(Node n : array[0]){
        if(n.isSet()){
            tmpBurnt.add(n);
        }
    }

    for(;;){
        if(tmpBurnt.isEmpty()){
            return;
        }
        for(Node n : tmpBurnt){
            //-----check left--------
            if(n.getX() > 0){
                left = array[n.getY()][n.getX() - 1];
                if(left.isSet() && !tmpBurnt.contains(left) && !this.burnt.contains(left)){
                    tmpSave.add(left);
                }
            }
            //-----check right--------
            if(n.getX() < array[n.getY()].length - 1){
                right = array[n.getY()][n.getX() + 1];
                if(right.isSet() && !tmpBurnt.contains(right) && !this.burnt.contains(right)){
                    tmpSave.add(right);
                }
            }
            //-----check below--------
            if(n.getY() < array.length - 1){
                below = array[n.getY() + 1][n.getX()];
                if(below.isSet() && !tmpBurnt.contains(below) && !this.burnt.contains(below)){
                    tmpSave.add(below);
                }
            }
        }
        for(Node n : tmpBurnt){
            this.burnt.add(n);
        }
        tmpBurnt.clear();
        for(Node n : tmpSave){
            tmpBurnt.add(n);
        }
        tmpSave.clear();
    }
}