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solution
Algorithmus notiones
Ut utram tabulam indices in arbore structurae determinemus, singula nodum recursive et altitudinem eius computare possumus. Speciatim, pro unaquaque nodo, nodi parentis sursum sursum percurrere possumus usque ad nodi radicem, dum altitudinem pretii accumulamus. Ultima profunditas pretii est planum ad quod nodi sita est.

codice exemplum
Simplex Java sequentia est exemplum codicis ad determinandum planitiem nodi in structura arboris;

public class TreeNode {
    private int id;
    private int parentId;

    public TreeNode(int id, int parentId) {
        this.id = id;
        this.parentId = parentId;
    }

    public int getId() {
        return id;
    }

    public int getParentId() {
        return parentId;
    }
}

public class TreeUtils {
    public static int getLevel(TreeNode node, List<TreeNode> nodeList) {
        int level = 1;
        int parentId = node.getParentId();
        
        while (parentId != 0) {
            for (TreeNode n : nodeList) {
                if (n.getId() == parentId) {
                    parentId = n.getParentId();
                    level++;
                    break;
                }
            }
        }
        
        return level;
    }
}

public class Main {
    public static void main(String[] args) {
        List<TreeNode> nodeList = new ArrayList<>();
        nodeList.add(new TreeNode(1, 0));
        nodeList.add(new TreeNode(2, 1));
        nodeList.add(new TreeNode(3, 1));
        nodeList.add(new TreeNode(4, 2));

        TreeNode node = nodeList.get(3);
        int level = TreeUtils.getLevel(node, nodeList);
        System.out.println("Node " + node.getId() + " is at level " + level);
    }
}
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