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  • 6.1: BinaryTree - A Basic Binary Tree
    https://eng.libretexts.org/Bookshelves/Computer_Science/Databases_and_Data_Structures/Open_Data_Structures_-_An_Introduction_(Morin)/06%3A_Binary_Trees/6.01%3A_BinaryTree_-_A_Basic_Binary_Tree
    int size2() { Node u = r, prev = nil, next; int n = 0; while (u != nil) { if (prev == u.parent) { n++; if (u.left != nil) next = u.left; else if (u.right != nil) next = u.right; else next = u.parent; ...int size2() { Node u = r, prev = nil, next; int n = 0; while (u != nil) { if (prev == u.parent) { n++; if (u.left != nil) next = u.left; else if (u.right != nil) next = u.right; else next = u.parent; } else if (prev == u.left) { if (u.right != nil) next = u.right; else next = u.parent; } else { next = u.parent; } prev = u; u = next; } return n; }

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