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5807F Assignment #193

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5807F Assignment #193

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7f7e102
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deep15499 Nov 21, 2022
14099a9
Merge pull request #1 from deep15499/deep15499-patch-1
deep15499 Nov 21, 2022
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deep15499 Dec 5, 2022
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Merge pull request #2 from deep15499/deep15499-patch-2
deep15499 Dec 5, 2022
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16 changes: 8 additions & 8 deletions .classpath
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Original file line number Diff line number Diff line change
@@ -1,8 +1,8 @@
<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" path="src"/>
<classpathentry kind="src" path="test"/>
<classpathentry kind="lib" path="lib/junit-4_4.3.1.jar"/>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
<classpathentry kind="output" path="bin"/>
</classpath>
<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" path="src"/>
<classpathentry kind="src" path="test"/>
<classpathentry kind="lib" path="lib/junit-4_4.3.1.jar"/>
<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
<classpathentry kind="output" path="bin"/>
</classpath>
6 changes: 3 additions & 3 deletions .gitignore
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@@ -1,3 +1,3 @@
/bin/
/build/
/dist/
/bin/
/build/
/dist/
34 changes: 17 additions & 17 deletions .project
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@@ -1,17 +1,17 @@
<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>JavaAlgorithmsImplementation</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
</natures>
</projectDescription>
<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
<name>JavaAlgorithmsImplementation</name>
<comment></comment>
<projects>
</projects>
<buildSpec>
<buildCommand>
<name>org.eclipse.jdt.core.javabuilder</name>
<arguments>
</arguments>
</buildCommand>
</buildSpec>
<natures>
<nature>org.eclipse.jdt.core.javanature</nature>
</natures>
</projectDescription>
68 changes: 34 additions & 34 deletions .travis.yml
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@@ -1,34 +1,34 @@
before_script:
- sudo apt-get install ant-optional
- export OPTS="-server -Xmx3072M"
- export JAVA_OPTS="${JAVA_OPTS} ${OPTS}"
- export ANT_OPTS="${ANT_OPTS} ${OPTS}"
- echo $JAVA_OPTS
- echo $ANT_OPTS

dist: trusty

language: java

jdk:
- oraclejdk9
- oraclejdk8
# - oraclejdk7
# - oraclejdk6

# - openjdk9
- openjdk8
- openjdk7
# - openjdk6

env:
- TEST_SUITE=run_tests
# - TEST_SUITE=mathematics
# - TEST_SUITE=numbers
# - TEST_SUITE=search
# - TEST_SUITE=sequences
# - TEST_SUITE=strings
# - TEST_SUITE=data_structures
# - TEST_SUITE=sorts

script: "ant $TEST_SUITE"
before_script:
- sudo apt-get install ant-optional
- export OPTS="-server -Xmx3072M"
- export JAVA_OPTS="${JAVA_OPTS} ${OPTS}"
- export ANT_OPTS="${ANT_OPTS} ${OPTS}"
- echo $JAVA_OPTS
- echo $ANT_OPTS
dist: trusty
language: java
jdk:
- oraclejdk9
- oraclejdk8
# - oraclejdk7
# - oraclejdk6
# - openjdk9
- openjdk8
- openjdk7
# - openjdk6
env:
- TEST_SUITE=run_tests
# - TEST_SUITE=mathematics
# - TEST_SUITE=numbers
# - TEST_SUITE=search
# - TEST_SUITE=sequences
# - TEST_SUITE=strings
# - TEST_SUITE=data_structures
# - TEST_SUITE=sorts
script: "ant $TEST_SUITE"
184 changes: 184 additions & 0 deletions DisjointSetTests.java
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@@ -0,0 +1,184 @@
package com.jwetherell.algorithms.data_structures.test;

import org.junit.Assert;
import org.junit.Test;

import com.jwetherell.algorithms.data_structures.DisjointSet;

@SuppressWarnings("unchecked")
public class DisjointSetTests {

private static boolean DEBUG = false;

@Test
public void testDisjointSet1() {
final int maximum = 10;
final int[] array = new int[maximum];
for (int i = 0; i < array.length; i++)
array[i] = i + 1;

final DisjointSet.Item<Integer>[] items = new DisjointSet.Item[array.length];
for (int i = 0; i < items.length; i++) {
final int v = array[i];
final DisjointSet.Item<Integer> s = DisjointSet.makeSet(v);
items[i] = s;
final DisjointSet.Item<Integer> f = DisjointSet.find(s);
Assert.assertTrue(f != null);
Assert.assertTrue(f.getValue() == v);
}
if (DEBUG)
System.out.println(toString(items));

final int half = items.length / 2;

// first half set
DisjointSet.Item<Integer> first = items[0];
for (int i = 1; i < half; i++) {
final DisjointSet.Item<Integer> item = items[i];
first = DisjointSet.union(first, item);
}
if (DEBUG)
System.out.println(toString(items));
// second half set
DisjointSet.Item<Integer> second = items[half];
for (int i = half + 1; i < items.length; i++) {
final DisjointSet.Item<Integer> item = items[i];
second = DisjointSet.union(second, item);
}
if (DEBUG)
System.out.println(toString(items));

// Make sure all items in first set are actually in first set and vice versa
for (int i = 0; i < half; i++) {
final DisjointSet.Item<Integer> item = items[i];
final DisjointSet.Item<Integer> result = DisjointSet.find(item);
Assert.assertTrue(result.equals(first));
}
for (int i = half; i < items.length; i++) {
final DisjointSet.Item<Integer> item = items[i];
final DisjointSet.Item<Integer> result = DisjointSet.find(item);
Assert.assertTrue(result.equals(second));
}

// merge second set and the first set and make sure the superset is created
DisjointSet.Item<Integer> superSet = first;
for (int i = 0; i < items.length; i++) {
final DisjointSet.Item<Integer> item = items[i];
superSet = DisjointSet.union(superSet, item);
}
if (DEBUG)
System.out.println(toString(items));
for (int i = 0; i < items.length; i++) {
final DisjointSet.Item<Integer> item = items[i];
final DisjointSet.Item<Integer> result = DisjointSet.find(item);
Assert.assertTrue(result.equals(superSet));
}
}

@Test
public void testDisjointSet2() {
final int maximum = 10;
final int[] array = new int[maximum];
for (int i = 0; i < array.length; i++)
array[i] = i + 1;

final DisjointSet.Item<Integer>[] items = new DisjointSet.Item[array.length];
for (int i = 0; i < items.length; i++) {
final int v = array[i];
final DisjointSet.Item<Integer> s = DisjointSet.makeSet(v);
items[i] = s;
final DisjointSet.Item<Integer> f = DisjointSet.find(s);
Assert.assertTrue(f != null);
Assert.assertTrue(f.getValue() == v);
}
if (DEBUG)
System.out.println(toString(items));

final int quarter = items.length / 4;

DisjointSet.Item<Integer> i1 = items[0];
for (int i = 1; i < quarter; i++) {
final DisjointSet.Item<Integer> item = items[i];
i1 = DisjointSet.union(i1, item);
}
DisjointSet.Item<Integer> i2 = items[quarter];
for (int i = quarter + 1; i < 2 * quarter; i++) {
final DisjointSet.Item<Integer> item = items[i];
i2 = DisjointSet.union(i2, item);
}
DisjointSet.Item<Integer> i3 = items[2 * quarter];
for (int i = 2 * quarter + 1; i < 3 * quarter; i++) {
final DisjointSet.Item<Integer> item = items[i];
i3 = DisjointSet.union(i3, item);
}
DisjointSet.Item<Integer> i4 = items[3 * quarter];
for (int i = 3 * quarter + 1; i < array.length; i++) {
final DisjointSet.Item<Integer> item = items[i];
i4 = DisjointSet.union(i4, item);
}
if (DEBUG)
System.out.println(toString(items));

DisjointSet.Item<Integer> s1 = DisjointSet.union(i1, i2);
DisjointSet.Item<Integer> s2 = DisjointSet.union(i3, i4);
DisjointSet.Item<Integer> s3 = DisjointSet.union(s1, s2);
Assert.assertTrue(s3.getValue() == 1 && s3.getRank() == 3);
if (DEBUG)
System.out.println(toString(items));
}

private static final String toString(DisjointSet.Item<Integer>[] items) {
final StringBuilder builder = new StringBuilder();
builder.append("{\n");
for (DisjointSet.Item<Integer> item : items) {
builder.append('\t').append(item.toString()).append('\n');
}
builder.append("}\n");
return builder.toString();
}

@Test
public void testDisjointSet3() {
final int maximum = 10;
final int[] arr = new int[maximum];
for (int i = 0; i < arr.length; i++)
arr[i] = i + 1;
final DisjointSet.Item<Integer>[] items = new DisjointSet.Item[arr.length];
for (int i = 0; i < items.length; i++) {
final int v = arr[i];
final DisjointSet.Item<Integer> s = DisjointSet.makeSet(v);
items[i] = s;
}
DisjointSet.Item<Integer> i1 = items[0];
DisjointSet.Item<Integer> i2 = items[1];
DisjointSet.Item<Integer> i3 = items[2];
DisjointSet.Item<Integer> i4 = items[3];

final DisjointSet.Item<Integer> xRoot = DisjointSet.union(null, i1);
Assert.assertTrue(xRoot.getValue() == i1.getValue());

final DisjointSet.Item<Integer> yRoot = DisjointSet.union(i2, null);
Assert.assertTrue(yRoot.getValue() == i2.getValue());

final DisjointSet.Item<Integer> equalRoots = DisjointSet.union(i2, i2);
Assert.assertTrue(equalRoots.getValue() == i2.getValue());

Assert.assertNull(DisjointSet.find(null));

Assert.assertNull(DisjointSet.union(null, null));

DisjointSet.Item<Integer> unequalIt1 = DisjointSet.union(i1, i2);
Assert.assertNotNull(unequalIt1);
DisjointSet.Item<Integer> unequalIt2 = DisjointSet.union(i1, i3);
Assert.assertNotNull(unequalIt2);
DisjointSet.Item<Integer> unequalIt3 = DisjointSet.union(i4, i1);
Assert.assertNotNull(unequalIt3);

Assert.assertFalse(unequalIt1.equals("False"));

String iString = i2.toString();
String expected = "parent=1 value=2";
Assert.assertTrue(iString.equals(expected));

}
}
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