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Data Structures Interview Questions

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Data Structures Interview Questions - Page 13

In an AVL tree, at what condition the balancing is to be done?


If the "pivotal value", or the "height factor", is greater than one or less than minus one
Link list does not have any advantage when compared to an Array.
A linked list can grow and shrink in size dynamically at runtime, whereas an array is set to a fixed size at compile time.

How do you find the depth of a binary tree?


The depth of a binary tree is found using the following process:
1. Send the root node of a binary tree to a function
2. If the tree node is null, then return false value.
3. Calculate the depth of the left tree; call it ‘d1’ by traversing every node. Increment the counter by 1, as the traversing progresses until it reaches the leaf node. These operations are done recursively.
4. Repeat the 3rd step for the left node. Name the counter variable ‘d2’.
5. Find the maximum value between d1 and d2. Add 1 to the max value. Let us call it ‘depth’.
6. The variable ‘depth’ is the depth of the binary tree.

What is the difference between ARRAY and STACK?


STACK follows LIFO. Thus the item that is first entered would be the last removed.In array the items can be entered or removed in any order. Basically each member access is done using index. No strict order is to be followed here to remove a particular element.

What is the Huffman algorithm?


A.In Huffman Algorithm, a set of nodes assigned with values if fed to the algorithm.
Initially 2 nodes are considered and their sum forms their parent node. When a new element is considered, it can be added to the tree. Its value and the previously calculated sum of the tree are used to form the new node which in turn becomes their parent.
 

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