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refactor: redesign ArrayCombination (#5181)

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* Related to #5164 (Redesign of ArrayCombination)

* Checkstyle fix

* Clang_format

* refactor: cleanup

---------

Co-authored-by: Piotr Idzik <65706193+vil02@users.noreply.github.com>
Co-authored-by: vil02 <vil02@o2.pl>
This commit is contained in:
yuvashreenarayanan3
2024-07-10 22:50:32 +05:30
committed by GitHub
parent 06927d3fda
commit f83bb659ba
2 changed files with 47 additions and 52 deletions
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57
src/test/java/com/thealgorithms/backtracking/ArrayCombinationTest.java
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@ -1,51 +1,36 @@
package com.thealgorithms.backtracking;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
import com.thealgorithms.maths.BinomialCoefficient;
import java.util.ArrayList;
import java.util.List;
import java.util.TreeSet;
import org.junit.jupiter.api.Test;
import java.util.stream.Stream;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;
public class ArrayCombinationTest {
@Test
void testNBeingZeroOrLess() {
List<TreeSet<Integer>> zeroResult = ArrayCombination.combination(0, 1);
List<TreeSet<Integer>> negativeResult = ArrayCombination.combination(-1, 1);
assertNull(zeroResult);
assertNull(negativeResult);
@ParameterizedTest
@MethodSource("regularInputs")
void testCombination(int n, int k, List<List<Integer>> expected) {
assertEquals(expected.size(), BinomialCoefficient.binomialCoefficient(n, k));
assertEquals(expected, ArrayCombination.combination(n, k));
}
@Test
void testNoLengthElement() {
List<TreeSet<Integer>> result = ArrayCombination.combination(2, 0);
assertNull(result);
@ParameterizedTest
@MethodSource("wrongInputs")
void testCombinationThrows(int n, int k) {
assertThrows(IllegalArgumentException.class, () -> ArrayCombination.combination(n, k));
}
@Test
void testLengthOne() {
List<TreeSet<Integer>> result = ArrayCombination.combination(2, 1);
assert result != null;
assertEquals(1, result.get(0).iterator().next());
assertEquals(2, result.get(1).iterator().next());
private static Stream<Arguments> regularInputs() {
return Stream.of(Arguments.of(0, 0, List.of(new ArrayList<Integer>())), Arguments.of(1, 0, List.of(new ArrayList<Integer>())), Arguments.of(1, 1, List.of(List.of(0))), Arguments.of(3, 0, List.of(new ArrayList<Integer>())), Arguments.of(3, 1, List.of(List.of(0), List.of(1), List.of(2))),
Arguments.of(4, 2, List.of(List.of(0, 1), List.of(0, 2), List.of(0, 3), List.of(1, 2), List.of(1, 3), List.of(2, 3))));
}
@Test
void testLengthTwo() {
List<TreeSet<Integer>> result = ArrayCombination.combination(2, 2);
assert result != null;
Integer[] arr = result.get(0).toArray(new Integer[2]);
assertEquals(1, arr[0]);
assertEquals(2, arr[1]);
}
@Test
void testLengthFive() {
List<TreeSet<Integer>> result = ArrayCombination.combination(10, 5);
assert result != null;
Integer[] arr = result.get(0).toArray(new Integer[5]);
assertEquals(1, arr[0]);
assertEquals(5, arr[4]);
private static Stream<Arguments> wrongInputs() {
return Stream.of(Arguments.of(-1, 0), Arguments.of(0, -1), Arguments.of(2, 100));
}
}