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feat: add WaveSort (#5252)

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* Implementing WaveSort Algorithm

* Refactor: Tests to ParameterizedTest

* Checkstyle: Fix wrong align

* Checkstyle: Fix wrong align for second line

* Checkstyle: Remove redundant line

* Naming: fix method name

* Documentation: adding links

* Fix: adding test for isWaveSorted method

* Documentation: adding description for WaveSort

* Testing: test wave sort assert

* Checkstyle: remove redundant whitespace

* Checkstyle: remove redundant newline

* Testing: improving tests

---------

Co-authored-by: alxklm <alx@alx.com>
Co-authored-by: vil02 <65706193+vil02@users.noreply.github.com>
This commit is contained in:
Alex Klymenko
2024-06-26 23:41:54 +03:00
committed by GitHub
parent 971f5fc85b
commit 7054535d36
3 changed files with 96 additions and 0 deletions
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48
src/test/java/com/thealgorithms/sorts/WaveSortTest.java Normal file
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package com.thealgorithms.sorts;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.Stream;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;
public class WaveSortTest {
@ParameterizedTest
@MethodSource("arraysToWaveSort")
public void waveSortTest(Integer[] array) {
WaveSort waveSort = new WaveSort();
final var inputHistogram = getHistogram(array);
final var sortedArray = waveSort.sort(array);
assertTrue(waveSort.isWaveSorted(sortedArray));
final var sortedHistogram = getHistogram(sortedArray);
assertEquals(inputHistogram, sortedHistogram, "Element counts do not match");
}
private Map<Integer, Integer> getHistogram(Integer[] array) {
Map<Integer, Integer> histogram = new HashMap<>();
for (final var element : array) {
histogram.put(element, histogram.getOrDefault(element, 0) + 1);
}
return histogram;
}
private static Stream<Object[]> arraysToWaveSort() {
return Stream.of(new Object[] {new Integer[] {7, 7, 11, 3, 4, 5, 15}}, new Object[] {new Integer[] {1, 2, 3, 4, 5, 6, 7, 8}}, new Object[] {new Integer[] {8, 7, 6, 5, 4, 3, 2, 1}}, new Object[] {new Integer[] {3, 3, 3, 3}}, new Object[] {new Integer[] {-1, -3, -2, -4, -6, -5}},
new Object[] {new Integer[] {5, 3, 1, 2, 9, 7, 6, 8, 4, 0}}, new Object[] {new Integer[] {1}}, new Object[] {new Integer[] {2, 1}}, new Object[] {new Integer[] {1, 2}}, new Object[] {new Integer[] {}}, new Object[] {new Integer[] {0, 5, -3, 2, -1, 4, -2, 1, 3}});
}
@ParameterizedTest
@MethodSource("waveSortedArrays")
public <T extends Comparable<T>> void testIsWaveSorted(T[] array, boolean expected) {
final WaveSort waveSort = new WaveSort();
assertEquals(expected, waveSort.isWaveSorted(array));
}
public static Stream<Object[]> waveSortedArrays() {
return Stream.of(new Object[] {new Integer[] {3, 1, 4, 2, 5}, Boolean.TRUE}, new Object[] {new Integer[] {3, 1, 4, 2}, Boolean.TRUE}, new Object[] {new Integer[] {1, 3, 2, 4, 5}, Boolean.FALSE}, new Object[] {new Integer[] {4, 3, 5, 2, 3, 1, 2}, Boolean.TRUE},
new Object[] {new Integer[] {10, 90, 49, 2, 1, 5, 23}, Boolean.FALSE}, new Object[] {new Integer[] {}, Boolean.TRUE}, new Object[] {new Integer[] {1}, Boolean.TRUE}, new Object[] {new Integer[] {2, 1}, Boolean.TRUE}, new Object[] {new Integer[] {4, 3, 2, 5}, Boolean.FALSE},
new Object[] {new Double[] {4.0, 3.0, 5.1, 2.1, 3.3, 1.1, 2.2}, Boolean.TRUE}, new Object[] {new Double[] {10.1, 2.0, 2.0}, Boolean.TRUE}, new Object[] {new String[] {"a", "b", "c", "d"}, Boolean.FALSE}, new Object[] {new String[] {"b", "a", "b", "a", "b"}, Boolean.TRUE});
}
}