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- public class Albero {
- public static int sommaNodiPari(Albero a) {
- return sommaAusiliarePari(a.left(), 2) + sommaAusiliarePari(a.right(), 2); //perche la root "a" sta a livello 1
- }
- public static int sommaAusiliarePari(Albero a, int livello) {
- int conta = 0;
- if (livello % 2 == 0) { // aumento SOLO SE IL LIVELLO E´PARI
- conta += a.val();
- }
- if (a.left() != null) {
- conta += sommaAusiliarePari(a.left(), livello + 1);
- }
- if (a.right() != null) {
- conta += sommaAusiliarePari(a.right(), livello + 1);
- }
- return conta;
- }
- }
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