This document discusses algorithms for finding the maximum and minimum elements in an array, including the straightforward method that requires 2n-2 comparisons and the divide-and-conquer method that requires fewer comparisons. It also covers graph traversal algorithms like breadth-first search (BFS) and depth-first search (DFS), and discusses applications like finding articulation points in a graph. Examples of applying BFS, DFS, and the algorithm for finding articulation points using DFS are provided.
Graph in data structure it gives you the information of the graph application. How to represent the Graph and also Graph Travesal is also there many terms are there related to garph
A graph G consists of a non empty set V called the set of nodes (points, vertices) of the graph, a set E, which is the set of edges of the graph and a mapping from the set of edges E to a pair of elements of V.
Any two nodes, which are connected by an edge in a graph are called "adjacent nodes".
In a graph G(V,E) an edge which is directed from one node to another is called a "directed edge", while an edge which has no specific direction is called an "undirected edge". A graph in which every edge is directed is called a "directed graph" or a "digraph". A graph in which every edge is undirected is called an "undirected graph".
If some of edges are directed and some are undirected in a graph then the graph is called a "mixed graph".
Any graph which contains some parallel edges is called a "multigraph".
If there is no more than one edge but a pair of nodes then, such a graph is called "simple graph."
A graph in which weights are assigned to every edge is called a "weighted graph".
In a graph, a node which is not adjacent to any other node is called "isolated node".
A graph containing only isolated nodes is called a "null graph". In a directed graph for any node v the number of edges which have v as initial node is called the "outdegree" of the node v. The number of edges to have v as their terminal node is called the "Indegree" of v and Sum of outdegree and indegree of a node v is called its total degree.
Graph in data structure it gives you the information of the graph application. How to represent the Graph and also Graph Travesal is also there many terms are there related to garph
A graph G consists of a non empty set V called the set of nodes (points, vertices) of the graph, a set E, which is the set of edges of the graph and a mapping from the set of edges E to a pair of elements of V.
Any two nodes, which are connected by an edge in a graph are called "adjacent nodes".
In a graph G(V,E) an edge which is directed from one node to another is called a "directed edge", while an edge which has no specific direction is called an "undirected edge". A graph in which every edge is directed is called a "directed graph" or a "digraph". A graph in which every edge is undirected is called an "undirected graph".
If some of edges are directed and some are undirected in a graph then the graph is called a "mixed graph".
Any graph which contains some parallel edges is called a "multigraph".
If there is no more than one edge but a pair of nodes then, such a graph is called "simple graph."
A graph in which weights are assigned to every edge is called a "weighted graph".
In a graph, a node which is not adjacent to any other node is called "isolated node".
A graph containing only isolated nodes is called a "null graph". In a directed graph for any node v the number of edges which have v as initial node is called the "outdegree" of the node v. The number of edges to have v as their terminal node is called the "Indegree" of v and Sum of outdegree and indegree of a node v is called its total degree.
A Graph is a non-linear data structure, which consists of vertices(or nodes) connected by edges(or arcs) where edges may be directed or undirected.
Graphs are a powerful and versatile data structure that easily allow you to represent real life relationships between different types of data (nodes).
introduction and representation of graph.
graph is collection of points and vertices.
there are 2 types of the graph 1. directed
2. undirected graph.
representation of graph 2 ways
Adjacency matrix
Adjacency list
Calculate the distance between two points
Set up and solve linear equations using segment addition and midpoint properties
Correctly use notation for distance and segments
A Graph is a non-linear data structure, which consists of vertices(or nodes) connected by edges(or arcs) where edges may be directed or undirected.
Graphs are a powerful and versatile data structure that easily allow you to represent real life relationships between different types of data (nodes).
introduction and representation of graph.
graph is collection of points and vertices.
there are 2 types of the graph 1. directed
2. undirected graph.
representation of graph 2 ways
Adjacency matrix
Adjacency list
Calculate the distance between two points
Set up and solve linear equations using segment addition and midpoint properties
Correctly use notation for distance and segments
Prepared as a conference tutorial, MIC-Electrical, Athens, Greece, 5th April 2014, updated and delivered again in Beijing, China, 27 January 2015 to students from Complex Systems Group, CSRC and Dept. of Engineering Physics, Tsinghua University
BFS is the most commonly used approach. BFS is a traversing algorithm where you should start traversing from a selected node (source or starting node) and traverse the graph layerwise thus exploring the neighbor nodes (nodes which are directly connected to the source node.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
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Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
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HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
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Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Student information management system project report ii.pdf
Unit ii divide and conquer -2
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UNIT-II
• Max-Min Problem
• Graphs problems: BFS
• DFS
• Articulation point
Material prepared by Dr. N. Subhash Chandra
From Web resources, Computer Algorithms , Horowitz, Sahni &
Rajasekaran
Max-Min Problem
TWO METHODS:
• Method 1 Straight forward: if we apply the general approach to
the array of size n, the number of comparisons required are 2n-2.
• Method-2: Divide and Conquer approach: we will divide the
problem into sub-problems and find the max and min of each group,
now max of each group will compare with the only max of another
group and min with min.
Problem: Analyze the algorithm to find the
maximum and minimum element from an
array.
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Straight forward Method: Max Min Problem
Divide Conquer method
Exercise problems: Construct Max-Min tree for
a) 25,13,8,50,98,-2,-17,45,55,88,97,5,-5
b) 78,-2,98,14,78,-10,67,45,39,100
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Comparison of Straight forward method and
Divide and Conquer Method
Divide and Conquer the complexity 3n/2 – 2 is the best, average, worst case
number of comparison when n is a power of two.
Comparisons with Straight Forward Method:
Compared with the 2n – 2 comparisons for the Straight Forward method, this is a
saving of 25% in comparisons. It can be shown that no algorithm based on
comparisons uses less than 3n/2 – 2 comparisons.
Ex: n=8
Straight forward method: 2*8-2=14 comparisons
Divide and Conquer method: 3*8/2-2= 10 comparisons
Graph Traversal Algorithms
Traversing the graph means examining all the nodes and vertices of the
graph. There are two standard methods
• Breadth First Search
• Depth First Search
• Applications: Articulation point, Topological Sort, Convex hull
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Graph Applications
• Web pages with links
• Road maps (e.g., Google maps)
• Airline routes
• Facebook friends
• Family trees
• Paths through a maze
Paths
• path: A path from vertex a to b is a sequence of edges that
can be followed starting from a to reach b.
• can be represented as vertices visited, or edges taken
• example, one path from V to Z: {b, h} or {V, X, Z}
• What are two paths from U to Y?
• path length: Number of vertices
or edges contained in the path.
• neighbor or adjacent: Two vertices
connected directly by an edge.
• example: V and X
XU
V
W
Z
Y
a
c
b
e
d
f
g
h
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Reachability, connectedness
• reachable: Vertex a is reachable from b
if a path exists from a to b.
• connected: A graph is connected if every
vertex is reachable from any other.
• Is the graph at top right connected?
• strongly connected: When every vertex
has an edge to every other vertex.
XU
V
W
Z
Y
a
c
b
e
d
f
g
h
a
c
b
d
a
c
b
d
e
Loops and cycles
• cycle: A path that begins and ends at the same node.
• example: {b, g, f, c, a} or {V, X, Y, W, U, V}.
• example: {c, d, a} or {U, W, V, U}.
• acyclic graph: One that does
not contain any cycles.
• loop: An edge directly from
a node to itself.
• Many graphs don't allow loops.
XU
V
W
Z
Y
a
c
b
e
d
f
g
h
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12
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Weighted graphs
• weight: Cost associated with a given edge.
• Some graphs have weighted edges, and some are unweighted.
• Edges in an unweighted graph can be thought of as having equal
weight (e.g. all 0, or all 1, etc.)
• Most graphs do not allow negative weights.
• example: graph of airline flights, weighted by miles between
cities:
Colcatta
Chennai
Mumb
Bhuv
Lacknow
Patna
Hyd
Delhi
Directed graphs
• directed graph ("digraph"): One where edges are one-way
connections between vertices.
• If graph is directed, a vertex has a separate in/out degree.
• A digraph can be weighted or unweighted.
• Is the graph below connected? Why or why not?
a
d
b
e
gf
c
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Digraph example
• Vertices= UW CSE courses (incomplete list)
• Edge (a, b) = a is a prerequisite for b
142
143 154
140
311
312
331
351
333
341
344403
352
373
120
410
332
374
131
421431 440
415
413
417
414
444446
450
451
452
Linked Lists, Trees, Graphs
• A binary tree is a graph with some restrictions:
• The tree is an unweighted, directed, acyclic graph (DAG).
• Each node's in-degree is at most 1, and out-degree is at most 2.
• There is exactly one path from the root to every node.
• A linked list is also a graph:
• Unweighted DAG.
• In/out degree of at most 1 for all nodes.
F
B
A E
K
H
JG
A B DC
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Searching for paths
• Searching for a path from one vertex to another:
• Sometimes, we just want any path (or want to know there is a
path).
• Sometimes, we want to minimize path length (# of edges).
• Sometimes, we want to minimize path cost (sum of edge weights).
• What is the shortest path from MIA to SFO?
Which path has the minimum cost?
ORD
PVD
MIA
DFW
SFO
LAX
LGA
HNL
$500
Algorithms
Breadth First Search Depth First Search
• Visit start vertex and put into a FIFO
queue.
• Repeatedly remove a vertex from the
queue, visit its unvisited adjacent vertices,
put newly visited vertices into the queue.
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Example
• Breadth-first traversal using a queue.
Order of
Traversal Queue rearA B D E C G F H I
Queue front
A
B D E
C G
F H
I
BFS-tree:
Note: The BFS-tree for undirected graph is a free tree
Example
• Depth-first traversal using an explicit stack.
Order of
Traversal StackA B C F E G D H I
The Preorder Depth First Tree:
Note: The DFS-tree for undirected graph is a free tree
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BFS, DFS Example
DFS, BFS Example
Starting the DFS at A, visit A -> B -> C,
backtrack to B, visit E -> F, backtrack to A,
visit D -> G -> H.
Starting the BFS at A, visit A -> B -> D -> C
-> E -> G -> H -> F.
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Difference b/w DFS, BFS
Complexities: When a vertex is
removed from the queue, we
examine its adjacent vertices.
O(n) if adjacency matrix used
O(vertex degree) if adjacency
lists used
Total time
O(mn), where m is number
of vertices in the component
that is searched (adjacency
matrix) = O(V2)
Adjacency list =O(V+E)
Application of DFS: Articulation point
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Algorithm for Articulation point
Time complexity of
above method is
O(V*(V+E)) for a
graph represented
using adjacency
list.
Algorithm to determine Bi-Connected Components
47
48