Tips on Homework 2 Fei Chen.

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Presentation transcript:

Tips on Homework 2 Fei Chen

Goal Understand the course material through homework 2 Show how to solve problems Blackboard presentation and recommended answers will be posted online later.

Tree

Idea Step 1: transform the prefix/post fix expression into an expression tree Step2: print out the infix representation according to the tree

Tree

Idea Insertion: for AVL trees, keep record of the height difference of each node and adjust the tree if necessary Deletion Choose a leaf node to replace the deleted node Delete the leaf node

AVL Tree Tips right rotation vs. left rotation

Hash

Idea If a collision occurs, two words will hash into the same slot. To compute the error probability, we need to understand the random source, i.e. the probability space

Heap

Idea Try the standard insertion methods For linear time heap building, start from an arbitrary tree and adapt the tree from the bottom to top The trick for deletion is to replace the root with the last element and then adapt the tree

Conclusion and Q&A All the problems are basic ones to help you understand the course material. Q&A.