2-D Arrays
Chapter 2
Part Two
Data Structures and Algorithms Using Python R. Necaise.
2-D Arrays
Arrays can be defined with multiple dimensions.
Two-dimensional arrays:
organize the data in rows and
• Set ADT: Unsorted List
◦ implemented using an unsorted Python list
• Sorted Sequences
◦ The efﬁciency of some algorithms can be improved when working with
sorted sequences
◦ we can use a sorted
Lang
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Amortized cost is the average cost per use of the operation (function or
method). It can only be used when the operation is used n times in sequence.
The classication of an algorithm based on the ord
Project 1
Homework 1
the sum of the minimum
values from each row in 2D array
Homework 2
Product of neighbors is odd or even(1/0)
Counting number of
nodes in a circular linked list
Takes 4D array as
pa
Variables and Memory
Variables are boxes in memory that hold values.
Each box has a name.
Python maintains a dictionary (keys that map to values)
that maps names to the boxes in memory.
The variab
Multidimensional Arrays
Cells inside of arrays can hold anything at all, including
other arrays.
If an array contains other arrays, it has multiple
dimensions.
Two-dimensional arrays can be thought
Introduction to Algorithm Analysis
Running time of an algorithm usually depends on the
data on which it operates.
Performance is bound by the absolute worst case input
for the algorithm.
Often expr
When Arrays Are Good
Great for storing contiguous data that do not grow,
shrink, or move very often.
Accessing items anywhere in an array is very fast, with
O(1) performance.
When Arrays Are Bad
In
Circular Arrays
Arrays have valid indices 0.n-1, but some applications
can wrap around, treating the array as a circle instead
of a line.
Instead of walking off the end of the array into an
invalid
Sets
Data Structures and Algorithms Using Python, by R. Necaise.
Chapter 3
Introduction
The Set is a common container used in
programming.
stores unique values.
represents the mathematical set structu
Searching
Data Structures and Algorithms Using Python R. Necaise
Searching
The process of selecting particular information
from a collection of data based on specific criteria.
Can be performed on di
• Abstraction
◦ a concept or an idea that is not real
◦ used by computer scientist to help manage complex problems
‣ restrict the focus to those properties that are relevant in the current
context
Algorithm Analysis
Data Structures and Algorithms Using Python R. Necaise
Part 1
Algorithms
Algorithms are designed to solve problems.
A problem can have multiple solutions.
How do we determine which
Arrays and Vectors
Data Structures and Algorithms Using Python R. Necaise.
Chapter 2
The Array Structure
An array is the most basic type of container.
Implemented at the hardware level.
Most language
Maps
Data Structures and Algorithms Using Python R. Necaise
Maps
Stores a collection of records.
A unique key identifies each record.
Records are selected by key value.
aka dictionary.
Python provide
• In Appendix A
• Rules of Coding
◦ Readability
‣ easy to read
‣ include comments
‣ use meaningful identiﬁers
◦ Comments
‣ only use the hash symbol
‣ describe various elements of code
• Varia
CSCI 241 Fall 2015
Project 3: Deques, Stacks, and Queues
DUE 0500 Monday 16 November 2015
AT NO POINT MAY YOU WORK ON THIS PROJECT WITHOUT
THE PHYSICAL PRESENCE OF YOUR TEAMMATE(S)
It is imperative th