AVL trees

This is a discussion on AVL trees within the C Programming forums, part of the General Programming Boards category; hi guys, i have a project on c to implement a dictionary depending on the avl trees the trouble is ...

  1. #1
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    AVL trees

    hi guys,

    i have a project on c to implement a dictionary depending on the avl trees
    the trouble is that i can't find a condition that applies to perform the double rotation
    the structure is

    Code:
     typedef struct node *avlptr;
    struct node{
    char[15] word;
    avlptr left;
    avlptr right;
    int height;
    };

  2. #2
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    Take a look at the Wikipedia article for AVL trees: AVL tree - Wikipedia, the free encyclopedia. They have a diagram on the right showing different types of rotations. The case of a left-right or right-left require a double rotation to balance. Read section 1.2 "Insertion" and look at the diagrams. They describe exactly the types of imbalance that require double rotation, and what rotations will balance the tree.

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