1. 1 Data Structures CSCI 132, Spring 2014 Lecture 1 Big Ideas in Data Structures Course website: http://mathcs.holycross.edu/~csci132

2. 2 Crafting a Program Four main ideas used in creating complex computer programs: Data Abstraction Modularity Algorithmic complexity Standard Tools

3. 3 Recall Problem Solving One of the most important problem solving techniques is: Divide Conquer & Glue

4. 4 Dealing with Abstraction Abstraction Allows you to capture common patterns in things and ignore inessential details. Black Box Abstraction Allows us to use things without knowing how they work. For example, a telephone. Data Hiding Allows use of a program component without knowing the specifics of how it is implemented.

5. 5 Layers of Abstraction We can build up layers of abstraction to create complexity. Without layers of abstraction we could not understand the most complex programs (e.g. Microsoft Word ~ 1,000,000 lines of code).

6. 6 Modularity The best programs are modular. The pieces can fit together and be used in many different ways. Lego building blocks are a classic example of modularity.

7. 7 Algorithmic Complexity Not all computer programs are equal. The efficiency of programs can be measured as: 1. The amount of time the program takes to run. 2. The amount of memory space used.

8. 8 Standard Programming Tools Data Structures Stacks Queues Lists Tables Trees Graphs Algorithms Searching Sorting Tree Traversal Graph Algorithms