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python
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18 / \ 10 35 / \ / \ 3 5 7 40 / \ / \ 2 12 21 1 A=2 e B=12 def sono_sorelle(root, A, B): if root is None: return False if root.left != None and root.right != None: if (root.left.val == A and root.right.val == B) or (root.left.val == B and root.right.val == A): return True trovato_sinistra = sono_sorelle(root.left, A,B) if trovato_sinistra: return True trovato_destra = sono_sorelle(root.right, A,B) if trovato_destra: return True return False
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