public static void MainTest(string[] args)
{
GaussianElimination.test1();
GaussianElimination.test2();
GaussianElimination.test3();
GaussianElimination.test4();
GaussianElimination.test5();
GaussianElimination.test6();
GaussianElimination.test7();
GaussianElimination.test8();
GaussianElimination.test9();
// N-by-N random system
int N = int.Parse(args[0]);
// build augmented matrix
double[][] A = new double[N][];
for (int i = 0; i < N; i++)
{
A[i] = new double[N];
for (int j = 0; j < N; j++)
{
A[i][j] = StdRandom.Uniform(1000);
}
}
double[] b = new double[N];
for (int i = 0; i < N; i++)
{
b[i] = StdRandom.Uniform(1000);
}
GaussianElimination.test(N + "-by-" + N + " (probably nonsingular)", A, b);
}
/// <summary>
/// Returns a uniformly random <c>k</c>-regular graph on <c>V</c> vertices
/// (not necessarily simple). The graph is simple with probability only about e^(-k^2/4),
/// which is tiny when k = 14.</summary>
/// <param name="V">the number of vertices in the graph</param>
/// <param name="k">the k-regular value</param>
/// <returns>a uniformly random <c>k</c>-regular graph on <c>V</c> vertices.</returns>
///
public static Graph Regular(int V, int k)
{
if (V * k % 2 != 0)
{
throw new ArgumentException("Number of vertices * k must be even");
}
Graph G = new Graph(V);
// create k copies of each vertex
int[] vertices = new int[V * k];
for (int v = 0; v < V; v++)
{
for (int j = 0; j < k; j++)
{
vertices[v + V * j] = v;
}
}
// pick a random perfect matching
StdRandom.Shuffle(vertices);
for (int i = 0; i < V * k / 2; i++)
{
G.AddEdge(vertices[2 * i], vertices[2 * i + 1]);
}
return(G);
}
public static void MainTest(string[] args)
{
int V = int.Parse(args[0]);
int E = int.Parse(args[1]);
// Eulerian cycle
Graph G1 = GraphGenerator.EulerianCycle(V, E);
EulerianCycle.UnitTest(G1, "Eulerian cycle");
// Eulerian path
Graph G2 = GraphGenerator.EulerianPath(V, E);
EulerianCycle.UnitTest(G2, "Eulerian path");
// empty graph
Graph G3 = new Graph(V);
EulerianCycle.UnitTest(G3, "empty graph");
// self loop
Graph G4 = new Graph(V);
int v4 = StdRandom.Uniform(V);
G4.AddEdge(v4, v4);
EulerianCycle.UnitTest(G4, "single self loop");
// union of two disjoint cycles
Graph H1 = GraphGenerator.EulerianCycle(V / 2, E / 2);
Graph H2 = GraphGenerator.EulerianCycle(V - V / 2, E - E / 2);
int[] perm = new int[V];
for (int i = 0; i < V; i++)
{
perm[i] = i;
}
StdRandom.Shuffle(perm);
Graph G5 = new Graph(V);
for (int v = 0; v < H1.V; v++)
{
foreach (int w in H1.Adj(v))
{
G5.AddEdge(perm[v], perm[w]);
}
}
for (int v = 0; v < H2.V; v++)
{
foreach (int w in H2.Adj(v))
{
G5.AddEdge(perm[V / 2 + v], perm[V / 2 + w]);
}
}
EulerianCycle.UnitTest(G5, "Union of two disjoint cycles");
// random digraph
Graph G6 = GraphGenerator.Simple(V, E);
EulerianCycle.UnitTest(G6, "simple graph");
}
/// <summary>
/// Returns a wheel graph on <c>V</c> vertices.</summary>
/// <param name="V">the number of vertices in the wheel</param>
/// <returns>a wheel graph on <c>V</c> vertices: a single vertex connected to
/// every vertex in a cycle on <c>V-1</c> vertices</returns>
///
public static Graph Wheel(int V)
{
if (V <= 1)
{
throw new ArgumentException("Number of vertices must be at least 2");
}
Graph G = new Graph(V);
int[] vertices = new int[V];
for (int i = 0; i < V; i++)
{
vertices[i] = i;
}
StdRandom.Shuffle(vertices);
// simple cycle on V-1 vertices
for (int i = 1; i < V - 1; i++)
{
G.AddEdge(vertices[i], vertices[i + 1]);
}
G.AddEdge(vertices[V - 1], vertices[1]);
// connect vertices[0] to every vertex on cycle
for (int i = 1; i < V; i++)
{
G.AddEdge(vertices[0], vertices[i]);
}
return(G);
}
/// <summary>
/// Returns a random simple bipartite graph on <c>V1</c> and <c>V2</c> vertices,
/// containing each possible edge with probability <c>p</c>.</summary>
/// <param name="V1">the number of vertices in one partition</param>
/// <param name="V2">the number of vertices in the other partition</param>
/// <param name="p">the probability that the graph contains an edge with one endpoint in either side</param>
/// <returns>a random simple bipartite graph on <c>V1</c> and <c>V2</c> vertices,
/// containing each possible edge with probability <c>p</c></returns>
/// <exception cref="ArgumentException">if probability is not between 0 and 1</exception>
///
public static Graph Bipartite(int V1, int V2, double p)
{
if (p < 0.0 || p > 1.0)
{
throw new ArgumentException("Probability must be between 0 and 1");
}
int[] vertices = new int[V1 + V2];
for (int i = 0; i < V1 + V2; i++)
{
vertices[i] = i;
}
StdRandom.Shuffle(vertices);
Graph G = new Graph(V1 + V2);
for (int i = 0; i < V1; i++)
{
for (int j = 0; j < V2; j++)
{
if (StdRandom.Bernoulli(p))
{
G.AddEdge(vertices[i], vertices[V1 + j]);
}
}
}
return(G);
}
public static void MainTest(string[] args)
{
int N = int.Parse(args[0]);
Complex[] x = new Complex[N];
// original data
Random rnd = new Random();
for (int i = 0; i < N; i++)
{
x[i] = new Complex(i, 0);
x[i] = new Complex(-2 * StdRandom.Uniform() + 1, 0);
}
FFT.Show(x, "x");
// FFT of original data
Complex[] y = FFT.Fft(x);
FFT.Show(y, "y = fft(x)");
// take inverse FFT
Complex[] z = FFT.Ifft(y);
FFT.Show(z, "z = ifft(y)");
// circular convolution of x with itself
Complex[] c = FFT.Cconvolve(x, x);
FFT.Show(c, "c = cconvolve(x, x)");
// linear convolution of x with itself
Complex[] d = FFT.Convolve(x, x);
FFT.Show(d, "d = convolve(x, x)");
}
/// <summary>
/// Returns a random simple DAG containing <c>V</c> vertices and <c>E</c> edges.
/// Note: it is not uniformly selected at random among all such DAGs.</summary>
/// <param name="V">the number of vertices</param>
/// <param name="E">the number of vertices</param>
/// <returns>a random simple DAG on <c>V</c> vertices, containing a total
/// of <c>E</c> edges</returns>
/// <exception cref="ArgumentException">if no such simple DAG exists</exception>
///
public static Digraph Dag(int V, int E)
{
if (E > (long)V * (V - 1) / 2)
{
throw new ArgumentException("Too many edges");
}
if (E < 0)
{
throw new ArgumentException("Too few edges");
}
Digraph G = new Digraph(V);
SET <Edge> set = new SET <Edge>();
int[] vertices = new int[V];
for (int i = 0; i < V; i++)
{
vertices[i] = i;
}
StdRandom.Shuffle(vertices);
while (G.E < E)
{
int v = StdRandom.Uniform(V);
int w = StdRandom.Uniform(V);
Edge e = new Edge(v, w);
if ((v < w) && !set.Contains(e))
{
set.Add(e);
G.AddEdge(vertices[v], vertices[w]);
}
}
return(G);
}
/// <summary>
/// Returns a random simple bipartite graph on <c>V1</c> and <c>V2</c> vertices
/// with <c>E</c> edges.</summary>
/// <param name="V1">the number of vertices in one partition</param>
/// <param name="V2">the number of vertices in the other partition</param>
/// <param name="E">the number of edges</param>
/// <returns>a random simple bipartite graph on <c>V1</c> and <c>V2</c> vertices,
/// containing a total of <c>E</c> edges</returns>
/// <exception cref="ArgumentException">if no such simple bipartite graph exists</exception>
///
public static Graph Bipartite(int V1, int V2, int E)
{
if (E > (long)V1 * V2)
{
throw new ArgumentException("Too many edges for bipartite graphs");
}
if (E < 0)
{
throw new ArgumentException("Too few edges for bipartite graphs");
}
Graph G = new Graph(V1 + V2);
int[] vertices = new int[V1 + V2];
for (int i = 0; i < V1 + V2; i++)
{
vertices[i] = i;
}
StdRandom.Shuffle(vertices);
SET <Edge> set = new SET <Edge>();
while (G.E < E)
{
int i = StdRandom.Uniform(V1);
int j = V1 + StdRandom.Uniform(V2);
Edge e = new Edge(vertices[i], vertices[j]);
if (!set.Contains(e))
{
set.Add(e);
G.AddEdge(vertices[i], vertices[j]);
}
}
return(G);
}
public static void MainTest(string[] args)
{
// command-line arguments
int N = int.Parse(args[0]);
// for backward compatibility with Intro to Programming in Java version of RandomSeq
if (args.Length == 1)
{
// generate and print N numbers between 0.0 and 1.0
for (int i = 0; i < N; i++)
{
double x = StdRandom.Uniform();
Console.WriteLine(x);
}
}
else if (args.Length == 3)
{
double lo = double.Parse(args[1]);
double hi = double.Parse(args[2]);
// generate and print N numbers between lo and hi
for (int i = 0; i < N; i++)
{
double x = StdRandom.Uniform(lo, hi);
Console.Write("{0:F2}\n", x);
}
}
else
{
throw new ArgumentException("Invalid number of arguments");
}
}
public static void MainTest(string[] args)
{
// create random DAG with V vertices and E edges; then add F random edges
int V = int.Parse(args[0]);
int E = int.Parse(args[1]);
int F = int.Parse(args[2]);
Digraph G = DigraphGenerator.Dag(V, E);
// add F extra edges
for (int i = 0; i < F; i++)
{
int v = StdRandom.Uniform(V);
int w = StdRandom.Uniform(V);
G.AddEdge(v, w);
}
Console.WriteLine(G);
DirectedCycleX finder = new DirectedCycleX(G);
if (finder.HasCycle)
{
Console.Write("Directed cycle: ");
foreach (int v in finder.GetCycle())
{
Console.Write(v + " ");
}
Console.WriteLine();
}
else
{
Console.WriteLine("No directed cycle");
}
Console.WriteLine();
}
/// <summary>Returns a random simple digraph containing <c>V</c> vertices and <c>E</c> edges.</summary>
/// <param name="V">the number of vertices</param>
/// <param name="E">the number of vertices</param>
/// <returns>a random simple digraph on <c>V</c> vertices, containing a total
/// of <c>E</c> edges</returns>
/// <exception cref="ArgumentException">if no such simple digraph exists</exception>
///
public static Digraph Simple(int V, int E)
{
if (E > (long)V * (V - 1))
{
throw new ArgumentException("Too many edges");
}
if (E < 0)
{
throw new ArgumentException("Too few edges");
}
Digraph G = new Digraph(V);
SET <Edge> set = new SET <Edge>();
while (G.E < E)
{
int v = StdRandom.Uniform(V);
int w = StdRandom.Uniform(V);
Edge e = new Edge(v, w);
if ((v != w) && !set.Contains(e))
{
set.Add(e);
G.AddEdge(v, w);
}
}
return(G);
}
public static void MainTest(string[] args)
{
int V1 = int.Parse(args[0]);
int V2 = int.Parse(args[1]);
int E = int.Parse(args[2]);
int F = int.Parse(args[3]);
Bipartite b;
// create random bipartite graph with V1 vertices on left side,
// V2 vertices on right side, and E edges; then add F random edges
Graph G = GraphGenerator.Bipartite(V1, V2, E);
Console.WriteLine("Graph is {0}\n", G);
b = new Bipartite(G);
BipartiteReport(b);
for (int i = 0; i < F; i++)
{
int v = StdRandom.Uniform(V1 + V2);
int w = StdRandom.Uniform(V1 + V2);
G.AddEdge(v, w);
}
Console.WriteLine("After adding {0} random edges", F);
Console.WriteLine("Graph is {0}\n", G);
b = new Bipartite(G);
BipartiteReport(b);
}
/// <summary>
/// Rearranges the array so that a[k] contains the kth smallest key;
/// a[0] through a[k-1] are OrderHelper.Less than (or equal to) a[k]; and
/// a[k+1] through a[N-1] are greater than (or equal to) a[k].</summary>
/// <param name="a">a the array</param>
/// <param name="k">k find the kth smallest</param>
/// <returns>the rearranged array</returns>
/// <exception cref="IndexOutOfRangeException"> if k is out of range</exception>
///
public static IComparable Select(IComparable[] a, int k)
{
if (k < 0 || k >= a.Length)
{
throw new IndexOutOfRangeException("Selected element out of bounds");
}
StdRandom.Shuffle(a);
int lo = 0, hi = a.Length - 1;
while (hi > lo)
{
int i = partition(a, lo, hi);
if (i > k)
{
hi = i - 1;
}
else if (i < k)
{
lo = i + 1;
}
else
{
return(a[i]);
}
}
return(a[lo]);
}
public static void MainTest(string[] args)
{
TwoPersonZeroSumGame.test1();
TwoPersonZeroSumGame.test2();
TwoPersonZeroSumGame.test3();
TwoPersonZeroSumGame.test4();
TwoPersonZeroSumGame.test5();
int M = 5, N = 5;
if (args.Length == 3)
{
M = int.Parse(args[1]);
N = int.Parse(args[2]);
}
double[,] payoff = new double[M, N];
for (int i = 0; i < M; i++)
{
for (int j = 0; j < N; j++)
{
payoff[i, j] = StdRandom.Uniform(-0.5, 0.5);
}
}
TwoPersonZeroSumGame.test("random " + M + "-by-" + N, payoff);
}
public static void MainTest(string[] args)
{
int n = int.Parse(args[0]);
if (args.Length == 2)
{
StdRandom.Seed = int.Parse(args[1]);
}
double[] probabilities = { 0.5, 0.3, 0.1, 0.1 };
int[] frequencies = { 5, 3, 1, 1 };
string[] a = "A B C D E F G".Split(' ');
Console.WriteLine("seed = " + StdRandom.Seed);
for (int i = 0; i < n; i++)
{
Console.Write("{0} ", StdRandom.Uniform(100));
Console.Write("{0:F5} ", StdRandom.Uniform(10.0, 99.0));
Console.Write("{0} ", StdRandom.Bernoulli(0.5));
Console.Write("{0:F5} ", StdRandom.Gaussian(9.0, 0.2));
Console.Write("{0} ", StdRandom.Discrete(probabilities));
Console.Write("{0} ", StdRandom.Discrete(frequencies));
StdRandom.Shuffle(a);
foreach (string s in a)
{
Console.Write(s);
}
Console.WriteLine();
}
}
// For a complete description, see
// http://www.proofwiki.org/wiki/Labeled_Tree_from_Prüfer_Sequence
// http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.36.6484&rep=rep1&type=pdf
/// <summary>
/// Returns a uniformly random tree on <c>V</c> vertices.
/// This algorithm uses a Prufer sequence and takes time proportional to <c>V log V</c>.</summary>
/// <param name="V">the number of vertices in the tree</param>
/// <returns>a uniformly random tree on <c>V</c> vertices</returns>
///
public static Graph Tree(int V)
{
Graph G = new Graph(V);
// special case
if (V == 1)
{
return(G);
}
// Cayley's theorem: there are V^(V-2) labeled trees on V vertices
// Prufer sequence: sequence of V-2 values between 0 and V-1
// Prufer's proof of Cayley's theorem: Prufer sequences are in 1-1
// with labeled trees on V vertices
int[] prufer = new int[V - 2];
for (int i = 0; i < V - 2; i++)
{
prufer[i] = StdRandom.Uniform(V);
}
// degree of vertex v = 1 + number of times it appers in Prufer sequence
int[] degree = new int[V];
for (int v = 0; v < V; v++)
{
degree[v] = 1;
}
for (int i = 0; i < V - 2; i++)
{
degree[prufer[i]]++;
}
// pq contains all vertices of degree 1
MinPQ <int> pq = new MinPQ <int>();
for (int v = 0; v < V; v++)
{
if (degree[v] == 1)
{
pq.Insert(v);
}
}
// repeatedly delMin() degree 1 vertex that has the minimum index
for (int i = 0; i < V - 2; i++)
{
int v = pq.DelMin();
G.AddEdge(v, prufer[i]);
degree[v]--;
degree[prufer[i]]--;
if (degree[prufer[i]] == 1)
{
pq.Insert(prufer[i]);
}
}
G.AddEdge(pq.DelMin(), pq.DelMin());
return(G);
}
public static void MainTest(string[] args)
{
Console.WriteLine("----- test 1 --------------------");
LinearProgramming.test1();
Console.WriteLine("----- test 2 --------------------");
LinearProgramming.test2();
Console.WriteLine("----- test 3 --------------------");
try
{
LinearProgramming.test3();
}
catch (ArithmeticException e)
{
Console.WriteLine(e.Message);
Console.WriteLine(e.StackTrace);
}
Console.WriteLine("----- test 4 --------------------");
LinearProgramming.test4();
Console.WriteLine("----- test random ---------------");
int M = 5, N = 5;
if (args.Length == 3)
{
M = int.Parse(args[1]);
N = int.Parse(args[2]);
}
double[] c = new double[N];
double[] b = new double[M];
double[,] A = new double[M, N];
for (int j = 0; j < N; j++)
{
c[j] = StdRandom.Uniform(1000);
}
for (int i = 0; i < M; i++)
{
b[i] = StdRandom.Uniform(1000);
}
for (int i = 0; i < M; i++)
{
for (int j = 0; j < N; j++)
{
A[i, j] = StdRandom.Uniform(100);
}
}
try
{
LinearProgramming lp = new LinearProgramming(A, b, c);
Console.WriteLine(lp.Value);
}
catch (ArithmeticException)
{
Console.WriteLine("The randomlly generated linear program is unbounded. Try again.");
}
}
public static void MainTest(string[] args)
{
// create random DAG with V vertices and E edges; then add F random edges
int V = int.Parse(args[0]);
int E = int.Parse(args[1]);
int F = int.Parse(args[2]);
EdgeWeightedDigraph G = new EdgeWeightedDigraph(V);
int[] vertices = new int[V];
for (int i = 0; i < V; i++)
{
vertices[i] = i;
}
StdRandom.Shuffle(vertices);
for (int i = 0; i < E; i++)
{
int v, w;
do
{
v = StdRandom.Uniform(V);
w = StdRandom.Uniform(V);
} while (v >= w);
double weight = StdRandom.Uniform();
G.AddEdge(new DirectedEdge(v, w, weight));
}
// add F extra edges
for (int i = 0; i < F; i++)
{
int v = StdRandom.Uniform(V);
int w = StdRandom.Uniform(V);
double weight = StdRandom.Uniform(0.0, 1.0);
G.AddEdge(new DirectedEdge(v, w, weight));
}
Console.WriteLine(G);
// find a directed cycle
EdgeWeightedDirectedCycle finder = new EdgeWeightedDirectedCycle(G);
if (finder.HasCycle)
{
Console.Write("Cycle: ");
foreach (DirectedEdge e in finder.GetCycle())
{
Console.Write(e + " ");
}
Console.WriteLine();
}
// or give topologial sort
else
{
Console.WriteLine("No directed cycle");
}
}
/// <summary>
/// Initializes a particle with a random position and velocity.
/// The position is uniform in the unit box; the velocity in
/// either direciton is chosen uniformly at random. Member initializers
/// will replace these random values.</summary>
/// <param name="target">the drawing target</param>
public Particle(DrawingWindow target) : base(target)
{
X = StdRandom.Uniform(0.0, 1.0);
Y = StdRandom.Uniform(0.0, 1.0);
Vx = StdRandom.Uniform(-.005, 0.005);
Vy = StdRandom.Uniform(-.005, 0.005);
Radius = 0.01;
Mass = 0.5;
color = Colors.Black;
}
public static void MainTest(string[] args)
{
GaussJordanElimination.test1();
GaussJordanElimination.test2();
GaussJordanElimination.test3();
GaussJordanElimination.test4();
GaussJordanElimination.test5();
GaussJordanElimination.test6();
// N-by-N random system (likely full rank)
int N = int.Parse(args[0]);
double[][] A = new double[N][];
for (int i = 0; i < N; i++)
{
A[i] = new double[N];
for (int j = 0; j < N; j++)
{
A[i][j] = StdRandom.Uniform(1000);
}
}
double[] b = new double[N];
for (int i = 0; i < N; i++)
{
b[i] = StdRandom.Uniform(1000);
}
GaussJordanElimination.test("random " + N + "-by-" + N + " (likely full rank)", A, b);
// N-by-N random system (likely infeasible)
A = new double[N][];
for (int i = 0; i < N - 1; i++)
{
A[i] = new double[N];
for (int j = 0; j < N; j++)
{
A[i][j] = StdRandom.Uniform(1000);
}
}
A[N - 1] = new double[N];
for (int i = 0; i < N - 1; i++)
{
double alpha = StdRandom.Uniform(11) - 5.0;
for (int j = 0; j < N; j++)
{
A[N - 1][j] += alpha * A[i][j];
}
}
b = new double[N];
for (int i = 0; i < N; i++)
{
b[i] = StdRandom.Uniform(1000);
}
GaussJordanElimination.test("random " + N + "-by-" + N + " (likely infeasible)", A, b);
}
/// <summary>Returns the amount of time to call <c>ThreeSum.count()</c>
/// with <c>N</c> random 6-digit integers.</summary>
/// <param name="N">N the number of integers</param>
/// <returns>amount of time (in seconds) to call <c>ThreeSum.count()</c>
/// with <c>N</c> random 6-digit integers</returns>
///
public static double TimeTrial(int N)
{
int[] a = new int[N];
for (int i = 0; i < N; i++)
{
a[i] = StdRandom.Uniform(-MAXIMUM_INTEGER, MAXIMUM_INTEGER);
}
Stopwatch timer = new Stopwatch();
ThreeSum.Count(a);
return(timer.ElapsedTime());
}
/// <summary>
/// Initializes a random flow network with <c>V</c> vertices and <c>E</c> edges.
/// The capacities are integers between 0 and 99 and the flow values are zero.</summary>
/// <param name="V">the number of vertices</param>
/// <param name="E">the number of edges</param>
/// <exception cref="ArgumentException">if <c>V</c> < 0</exception>
/// <exception cref="ArgumentException">if <c>E</c> < 0</exception>
///
public FlowNetwork(int V, int E) : this(V)
{
if (E < 0)
{
throw new ArgumentException("Number of edges must be nonnegative");
}
for (int i = 0; i < E; i++)
{
int v = StdRandom.Uniform(V);
int w = StdRandom.Uniform(V);
double capacity = StdRandom.Uniform(100);
AddEdge(new FlowEdge(v, w, capacity));
}
}
/// <summary>
/// Initializes a random edge-weighted digraph with <c>V</c> vertices and <c>E</c> edges.</summary>
/// <param name="V">the number of vertices</param>
/// <param name="E">the number of edges</param>
/// <exception cref="ArgumentException">if <c>V</c> < 0</exception>
/// <exception cref="ArgumentException">if <c>E</c> < 0</exception>
///
public EdgeWeightedDigraph(int V, int E) : this(V)
{
if (E < 0)
{
throw new ArgumentException("Number of edges in a Digraph must be nonnegative");
}
for (int i = 0; i < E; i++)
{
int v = StdRandom.Uniform(V);
int w = StdRandom.Uniform(V);
double weight = .01 * StdRandom.Uniform(100);
DirectedEdge e = new DirectedEdge(v, w, weight);
AddEdge(e);
}
}
/// <summary>
/// Initializes a random edge-weighted graph with <c>V</c> vertices and <c>E</c> edges.</summary>
/// <param name="V"> V the number of vertices</param>
/// <param name="E"> E the number of edges</param>
/// <exception cref="ArgumentException">if <c>V</c> < 0</exception>
/// <exception cref="ArgumentException">if <c>E</c> < 0</exception>
///
public EdgeWeightedGraph(int V, int E) : this(V)
{
if (E < 0)
{
throw new ArgumentException("Number of edges must be nonnegative");
}
for (int i = 0; i < E; i++)
{
int v = StdRandom.Uniform(V);
int w = StdRandom.Uniform(V);
double weight = Math.Round(100 * StdRandom.Uniform()) / 100.0;
Edge e = new Edge(v, w, weight);
AddEdge(e);
}
}
public static void MainTest(string[] args)
{
int V = int.Parse(args[0]);
int E = int.Parse(args[1]);
// Eulerian cycle
Digraph G1 = DigraphGenerator.EulerianCycle(V, E);
DirectedEulerianPath.UnitTest(G1, "Eulerian cycle");
// Eulerian path
Digraph G2 = DigraphGenerator.EulerianPath(V, E);
DirectedEulerianPath.UnitTest(G2, "Eulerian path");
// add one random edge
Digraph G3 = new Digraph(G2);
G3.AddEdge(StdRandom.Uniform(V), StdRandom.Uniform(V));
DirectedEulerianPath.UnitTest(G3, "one random edge added to Eulerian path");
// self loop
Digraph G4 = new Digraph(V);
int v4 = StdRandom.Uniform(V);
G4.AddEdge(v4, v4);
DirectedEulerianPath.UnitTest(G4, "single self loop");
// single edge
Digraph G5 = new Digraph(V);
G5.AddEdge(StdRandom.Uniform(V), StdRandom.Uniform(V));
DirectedEulerianPath.UnitTest(G5, "single edge");
// empty digraph
Digraph G6 = new Digraph(V);
DirectedEulerianPath.UnitTest(G6, "empty digraph");
// random digraph
Digraph G7 = DigraphGenerator.Simple(V, E);
DirectedEulerianPath.UnitTest(G7, "simple digraph");
// 4-vertex digraph
//Digraph G8 = new Digraph(new TextInput("eulerianD.txt"));
//DirectedEulerianPath.UnitTest(G8, "4-vertex Eulerian digraph");
}
/// <summary>
/// Returns a complete binary tree digraph on <c>V</c> vertices.</summary>
/// <param name="V">the number of vertices in the binary tree</param>
/// <returns>a digraph that is a complete binary tree on <c>V</c> vertices</returns>
///
public static Digraph BinaryTree(int V)
{
Digraph G = new Digraph(V);
int[] vertices = new int[V];
for (int i = 0; i < V; i++)
{
vertices[i] = i;
}
StdRandom.Shuffle(vertices);
for (int i = 1; i < V; i++)
{
G.AddEdge(vertices[i], vertices[(i - 1) / 2]);
}
return(G);
}
/// <summary>
/// Returns a path digraph on <c>V</c> vertices.</summary>
/// <param name="V">the number of vertices in the path</param>
/// <returns>a digraph that is a directed path on <c>V</c> vertices</returns>
///
public static Digraph Path(int V)
{
Digraph G = new Digraph(V);
int[] vertices = new int[V];
for (int i = 0; i < V; i++)
{
vertices[i] = i;
}
StdRandom.Shuffle(vertices);
for (int i = 0; i < V - 1; i++)
{
G.AddEdge(vertices[i], vertices[i + 1]);
}
return(G);
}
/// <summary>
/// Returns a cycle graph on <c>V</c> vertices.</summary>
/// <param name="V">the number of vertices in the cycle</param>
/// <returns>a cycle graph on <c>V</c> vertices</returns>
///
public static Graph Cycle(int V)
{
Graph G = new Graph(V);
int[] vertices = new int[V];
for (int i = 0; i < V; i++)
{
vertices[i] = i;
}
StdRandom.Shuffle(vertices);
for (int i = 0; i < V - 1; i++)
{
G.AddEdge(vertices[i], vertices[i + 1]);
}
G.AddEdge(vertices[V - 1], vertices[0]);
return(G);
}
public static void MainTest(string[] args)
{
TextInput StdIn = new TextInput();
string[] a = StdIn.ReadAllStrings();
OrderHelper.Show(a);
// shuffle
StdRandom.Shuffle(a);
// display results again using select
Console.WriteLine();
for (int i = 0; i < a.Length; i++)
{
string ith = (string)Quick.Select(a, i);
Console.WriteLine(ith);
}
}
public static void MainTest(string[] args)
{
int V = int.Parse(args[0]);
int E = int.Parse(args[1]);
// Eulerian cycle
Graph G1 = GraphGenerator.EulerianCycle(V, E);
EulerianPath.UnitTest(G1, "Eulerian cycle");
// Eulerian path
Graph G2 = GraphGenerator.EulerianPath(V, E);
EulerianPath.UnitTest(G2, "Eulerian path");
// add one random edge
Graph G3 = new Graph(G2);
G3.AddEdge(StdRandom.Uniform(V), StdRandom.Uniform(V));
EulerianPath.UnitTest(G3, "one random edge added to Eulerian path");
// self loop
Graph G4 = new Graph(V);
int v4 = StdRandom.Uniform(V);
G4.AddEdge(v4, v4);
EulerianPath.UnitTest(G4, "single self loop");
// single edge
Graph G5 = new Graph(V);
G5.AddEdge(StdRandom.Uniform(V), StdRandom.Uniform(V));
EulerianPath.UnitTest(G5, "single edge");
// empty graph
Graph G6 = new Graph(V);
EulerianPath.UnitTest(G6, "empty graph");
// random graph
Graph G7 = GraphGenerator.Simple(V, E);
EulerianPath.UnitTest(G7, "simple graph");
}