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Add Linear search algorithm

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This commit is contained in:
William Brawner 2018-10-13 10:43:47 -05:00
parent f6cc3e2878
commit 6f1256575d
15 changed files with 174 additions and 41 deletions
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24
.idea/codeStyles/Project.xml
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@ -24,29 +24,5 @@
<option name="ITERATION_ELEMENTS_WRAPPING" value="chop_down_if_not_single" />
</formatting-settings>
</DBN-SQL>
<DBN-PSQL>
<case-options enabled="false">
<option name="KEYWORD_CASE" value="lower" />
<option name="FUNCTION_CASE" value="lower" />
<option name="PARAMETER_CASE" value="lower" />
<option name="DATATYPE_CASE" value="lower" />
<option name="OBJECT_CASE" value="preserve" />
</case-options>
<formatting-settings enabled="false" />
</DBN-PSQL>
<DBN-SQL>
<case-options enabled="false">
<option name="KEYWORD_CASE" value="lower" />
<option name="FUNCTION_CASE" value="lower" />
<option name="PARAMETER_CASE" value="lower" />
<option name="DATATYPE_CASE" value="lower" />
<option name="OBJECT_CASE" value="preserve" />
</case-options>
<formatting-settings enabled="false">
<option name="STATEMENT_SPACING" value="one_line" />
<option name="CLAUSE_CHOP_DOWN" value="chop_down_if_statement_long" />
<option name="ITERATION_ELEMENTS_WRAPPING" value="chop_down_if_not_single" />
</formatting-settings>
</DBN-SQL>
</code_scheme>
</component>

2
.idea/compiler.xml
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@ -4,6 +4,8 @@
<bytecodeTargetLevel>
<module name="algorithms_main" target="1.8" />
<module name="algorithms_test" target="1.8" />
<module name="searching_main" target="1.8" />
<module name="searching_test" target="1.8" />
<module name="sorting_main" target="1.8" />
<module name="sorting_test" target="1.8" />
</bytecodeTargetLevel>

2
.idea/gradle.xml
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@ -8,9 +8,11 @@
<option name="modules">
<set>
<option value="$PROJECT_DIR$" />
<option value="$PROJECT_DIR$/searching" />
<option value="$PROJECT_DIR$/sorting" />
</set>
</option>
<option name="useAutoImport" value="true" />
</GradleProjectSettings>
</option>
</component>

4
.idea/modules.xml
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@ -5,6 +5,10 @@
<module fileurl="file://$PROJECT_DIR$/.idea/modules/algorithms.iml" filepath="$PROJECT_DIR$/.idea/modules/algorithms.iml" />
<module fileurl="file://$PROJECT_DIR$/.idea/modules/algorithms_main.iml" filepath="$PROJECT_DIR$/.idea/modules/algorithms_main.iml" group="algorithms" />
<module fileurl="file://$PROJECT_DIR$/.idea/modules/algorithms_test.iml" filepath="$PROJECT_DIR$/.idea/modules/algorithms_test.iml" group="algorithms" />
<module fileurl="file://$PROJECT_DIR$/searching/searching.iml" filepath="$PROJECT_DIR$/searching/searching.iml" group="searching" />
<module fileurl="file://$PROJECT_DIR$/searching/searching.iml" filepath="$PROJECT_DIR$/searching/searching.iml" />
<module fileurl="file://$PROJECT_DIR$/.idea/modules/searching/searching_main.iml" filepath="$PROJECT_DIR$/.idea/modules/searching/searching_main.iml" group="searching" />
<module fileurl="file://$PROJECT_DIR$/.idea/modules/searching/searching_test.iml" filepath="$PROJECT_DIR$/.idea/modules/searching/searching_test.iml" group="searching" />
<module fileurl="file://$PROJECT_DIR$/.idea/modules/sorting.iml" filepath="$PROJECT_DIR$/.idea/modules/sorting.iml" group="sorting" />
<module fileurl="file://$PROJECT_DIR$/.idea/modules/sorting/sorting_main.iml" filepath="$PROJECT_DIR$/.idea/modules/sorting/sorting_main.iml" group="sorting" />
<module fileurl="file://$PROJECT_DIR$/.idea/modules/sorting/sorting_test.iml" filepath="$PROJECT_DIR$/.idea/modules/sorting/sorting_test.iml" group="sorting" />

7
.idea/modules/algorithms_main.iml
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@ -1,12 +1,9 @@
<?xml version="1.0" encoding="UTF-8"?>
<module external.linked.project.id="algorithms:main" external.linked.project.path="$MODULE_DIR$/../.." external.root.project.path="$MODULE_DIR$/../.." external.system.id="GRADLE" external.system.module.group="com.wbrawner" external.system.module.type="sourceSet" external.system.module.version="1.0-SNAPSHOT" type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager">
<component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8">
<output url="file://$MODULE_DIR$/../../out/production/classes" />
<exclude-output />
<content url="file://$MODULE_DIR$/../../src/main">
<sourceFolder url="file://$MODULE_DIR$/../../src/main/java" isTestSource="false" />
<sourceFolder url="file://$MODULE_DIR$/../../src/main/resources" type="java-resource" />
</content>
<content url="file://$MODULE_DIR$/../../src/main" />
<orderEntry type="inheritedJdk" />
<orderEntry type="sourceFolder" forTests="false" />
</component>

7
.idea/modules/algorithms_test.iml
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@ -1,12 +1,9 @@
<?xml version="1.0" encoding="UTF-8"?>
<module external.linked.project.id="algorithms:test" external.linked.project.path="$MODULE_DIR$/../.." external.root.project.path="$MODULE_DIR$/../.." external.system.id="GRADLE" external.system.module.group="com.wbrawner" external.system.module.type="sourceSet" external.system.module.version="1.0-SNAPSHOT" type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager">
<component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8">
<output-test url="file://$MODULE_DIR$/../../out/test/classes" />
<exclude-output />
<content url="file://$MODULE_DIR$/../../src/test">
<sourceFolder url="file://$MODULE_DIR$/../../src/test/java" isTestSource="true" />
<sourceFolder url="file://$MODULE_DIR$/../../src/test/resources" type="java-test-resource" />
</content>
<content url="file://$MODULE_DIR$/../../src/test" />
<orderEntry type="inheritedJdk" />
<orderEntry type="sourceFolder" forTests="false" />
<orderEntry type="module" module-name="algorithms_main" />

3
.idea/modules/sorting/sorting_main.iml
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@ -1,11 +1,10 @@
<?xml version="1.0" encoding="UTF-8"?>
<module external.linked.project.id=":sorting:main" external.linked.project.path="$MODULE_DIR$/../../../sorting" external.root.project.path="$MODULE_DIR$/../../.." external.system.id="GRADLE" external.system.module.group="com.wbrawner" external.system.module.type="sourceSet" external.system.module.version="1.0-SNAPSHOT" type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager">
<component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8">
<output url="file://$MODULE_DIR$/../../../sorting/out/production/classes" />
<exclude-output />
<content url="file://$MODULE_DIR$/../../../sorting/src/main">
<sourceFolder url="file://$MODULE_DIR$/../../../sorting/src/main/java" isTestSource="false" />
<sourceFolder url="file://$MODULE_DIR$/../../../sorting/src/main/resources" type="java-resource" />
</content>
<orderEntry type="inheritedJdk" />
<orderEntry type="sourceFolder" forTests="false" />

3
.idea/modules/sorting/sorting_test.iml
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@ -1,11 +1,10 @@
<?xml version="1.0" encoding="UTF-8"?>
<module external.linked.project.id=":sorting:test" external.linked.project.path="$MODULE_DIR$/../../../sorting" external.root.project.path="$MODULE_DIR$/../../.." external.system.id="GRADLE" external.system.module.group="com.wbrawner" external.system.module.type="sourceSet" external.system.module.version="1.0-SNAPSHOT" type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager">
<component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_8">
<output-test url="file://$MODULE_DIR$/../../../sorting/out/test/classes" />
<exclude-output />
<content url="file://$MODULE_DIR$/../../../sorting/src/test">
<sourceFolder url="file://$MODULE_DIR$/../../../sorting/src/test/java" isTestSource="true" />
<sourceFolder url="file://$MODULE_DIR$/../../../sorting/src/test/resources" type="java-test-resource" />
</content>
<orderEntry type="inheritedJdk" />
<orderEntry type="sourceFolder" forTests="false" />

11
README.md
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@ -4,12 +4,18 @@ This repository is meant for me to compile a list of examples of different
algorithms that I have learned of, and develop a working implementation.
These implementations may not be the most efficient, so please do point it
out to me if you see something that could be improved upon. The complexity
notations were taken from the [Big O Cheatsheet](http://bigocheatsheet.com/)
notations were taken from the [Big O Cheat Sheet](http://bigocheatsheet.com/)
### Searching
Algorithm|Implementation|Tests|Worst Time Complexity|Worst Space Complexity
-----|-----|-----|:-----:|:-----:
[Linear Search](https://en.wikipedia.org/wiki/Linear_search)|[LinearSearch.java](searching/src/main/java/com/wbrawner/algorithms/searching/LinearSearch.java)|[ParameterizedLinearSearchTest.java](searching/src/test/java/com/wbrawner/algorithms/searching/ParameterizedLinearSearchTest.java)|O(n)|O(1)
### Sorting
Algorithm|Implementation|Tests|Worst Time Complexity|Worst Space Complexity
-----|-----|-----|-----|-----
-----|-----|-----|:-----:|:-----:
[Bubble Sort](https://en.wikipedia.org/wiki/Bubble_sort)|[BubbleSort.java](sorting/src/main/java/com/wbrawner/algorithms/sorting/BubbleSort.java)|[ParameterizedBubbleSortTest.java](sorting/src/test/java/com/wbrawner/algorithms/sorting/ParameterizedBubbleSortTest.java)|O(n²)|O(1)
[Insertion Sort](https://en.wikipedia.org/wiki/Insertion_sort)|[InsertionSort.java](sorting/src/main/java/com/wbrawner/algorithms/sorting/InsertionSort.java)|[ParameterizedInsertionSortTest.java](sorting/src/test/java/com/wbrawner/algorithms/sorting/ParameterizedInsertionSortTest.java)|O(n²)|O(1)
[Merge Sort](https://en.wikipedia.org/wiki/Merge_sort)|[MergeSort.java](sorting/src/main/java/com/wbrawner/algorithms/sorting/MergeSort.java)|[ParameterizedMergeSortTest.java](sorting/src/test/java/com/wbrawner/algorithms/sorting/ParameterizedMergeSortTest.java)|O(n log(n))|O(n)
@ -21,4 +27,5 @@ Algorithm|Implementation|Tests|Worst Time Complexity|Worst Space Complexity
To keep things simple, the tests share the same data where possible.
- [Searching algorithms test data](searching/src/test/java/com/wbrawner/algorithms/searching/SearchData.java)
- [Sorting algorithms test data](sorting/src/test/java/com/wbrawner/algorithms/sorting/SortData.java)

14
searching/build.gradle Normal file
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@ -0,0 +1,14 @@
group 'com.wbrawner'
version '1.0-SNAPSHOT'
apply plugin: 'java'
sourceCompatibility = 1.8
repositories {
mavenCentral()
}
dependencies {
testCompile group: 'junit', name: 'junit', version: '4.12'
}

13
searching/searching.iml Normal file
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@ -0,0 +1,13 @@
<?xml version="1.0" encoding="UTF-8"?>
<module external.linked.project.id=":searching" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$/.." external.system.id="GRADLE" external.system.module.group="com.wbrawner" external.system.module.version="1.0-SNAPSHOT" type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager" inherit-compiler-output="true">
<exclude-output />
<content url="file://$MODULE_DIR$">
<excludeFolder url="file://$MODULE_DIR$/.gradle" />
<excludeFolder url="file://$MODULE_DIR$/build" />
<excludeFolder url="file://$MODULE_DIR$/out" />
</content>
<orderEntry type="inheritedJdk" />
<orderEntry type="sourceFolder" forTests="false" />
</component>
</module>

22
searching/src/main/java/com/wbrawner/algorithms/searching/LinearSearch.java Normal file
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@ -0,0 +1,22 @@
package com.wbrawner.algorithms.searching;
/**
* Linear search begins at the first index, looping through each element of the array in order and comparing the
* value at each index with the value being searched for.
*/
class LinearSearch {
/**
* Search the given array for the given element using the Linear search algorithm
*
* @return The index of the array where the element can be found or -1 if it can't be found
*/
static int search(int[] array, int element) {
for (int i = 0; i < array.length; i++) {
if (array[i] == element) {
return i;
}
}
return -1;
}
}

33
searching/src/test/java/com/wbrawner/algorithms/searching/ParameterizedLinearSearchTest.java Normal file
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@ -0,0 +1,33 @@
package com.wbrawner.algorithms.searching;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import static junit.framework.TestCase.assertEquals;
@RunWith(Parameterized.class)
public class ParameterizedLinearSearchTest {
@Parameterized.Parameter()
public int[] array;
@Parameterized.Parameter(1)
public int searchFor;
@Parameterized.Parameter(2)
public int expectedIndex;
@Test
public void searchTest() {
assertEquals(
expectedIndex,
LinearSearch.search(array, searchFor)
);
}
@Parameterized.Parameters
public static Object[][] getData() {
return SearchData.get();
}
}

68
searching/src/test/java/com/wbrawner/algorithms/searching/SearchData.java Normal file
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@ -0,0 +1,68 @@
package com.wbrawner.algorithms.searching;
class SearchData {
/**
* Test helper method to get test data for searching tests
*
* @return a multidimensional array of unsorted and sorted arrays wrapped
* in an array
*/
static Object[][] get() {
return new Object[][]{
// First data set - unsorted array with even number of items
new Object[]{
// Haystack
new int[]{5, 4, 1, 8, 7, 2, 6, 3},
// Needle
2,
// Expected index
5,
},
// Second data set - sorted array with even number of items
new Object[]{
// Haystack
new int[]{1, 2, 3, 4, 5, 6, 7, 8},
// Needle
2,
// Expected index
1,
},
// Third data set - unsorted array with odd number of items
new Object[]{
// Haystack
new int[]{9, 5, 4, 1, 8, 7, 2, 6, 3},
// Needle
3,
// Expected index
8,
},
// Fourth data set - sorted array with odd number of items
new Object[]{
// Haystack
new int[]{1, 2, 3, 4, 5, 6, 7, 8, 9},
// Needle
7,
// Expected index
6,
},
// Fifth data set - empty array
new Object[]{
// Haystack
new int[]{},
// Needle
4,
// Expected index
-1,
},
// Sixth data set - a single integer array
new Object[]{
// Haystack
new int[]{1},
// Needle
1,
// Expected index
0,
},
};
}
}

2
settings.gradle
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@ -1,3 +1,3 @@
rootProject.name = 'algorithms'
include 'sorting'
include 'searching', 'sorting'