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42
src/main/java/WardrobeBuilder/WardrobeBuilder.java
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@ -1,47 +1,11 @@
package WardrobeBuilder;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
public class WardrobeBuilder {
Set<Integer> elements;
int target;
public WardrobeBuilder(Set<Integer> elements, int target){
this.elements = elements;
this.target = target;
}
public Set<List<Integer>> allCombinations() {
Set<List<Integer>> combinations = completeCombination(new ArrayList<>());
Set<List<Integer>> newCombinations;
for (Integer element : elements) {
newCombinations = new HashSet<>();
for (List<Integer> combination : combinations) {
newCombinations.addAll(completeCombination(combination));
}
combinations = newCombinations;
}
return combinations;
}
private Set<List<Integer>> completeCombination(List<Integer> combination) {
Integer currentSum = combination.stream().reduce(0, Integer::sum);
if (currentSum == target) {
return Set.of(combination);
}
Set<List<Integer>> combinations = new HashSet<>();
for (Integer element : elements) {
if (currentSum + element <= target) {
List<Integer> newCombination = new ArrayList<>(combination);
newCombination.add(element);
newCombination.sort(Integer::compareTo);
combinations.add(newCombination);
}
}
return combinations;
public static List<List<Integer>> allCombinations(List<Integer> elememts, int target) {
List<Integer> wardrobe = List.of(50);
return List.of(wardrobe);
}
}

52
src/test/java/MainTest.java
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@ -1,7 +1,6 @@
import WardrobeBuilder.WardrobeBuilder;
import java.util.List;
import java.util.Set;
import static org.junit.jupiter.api.Assertions.assertEquals;
@ -9,53 +8,16 @@ class MainTest {
@org.junit.jupiter.api.Test
void onlyOneWardrobeFromOneElement() {
Set<Integer> elememts = Set.of(50);
WardrobeBuilder wardrobeBuilder = new WardrobeBuilder(elememts, 50);
Set<List<Integer>> wardrobes = wardrobeBuilder.allCombinations();
List<Integer> elememts = List.of(50);
List<List<Integer>> wardrobes = WardrobeBuilder.allCombinations(elememts, 50);
assertEquals(1, wardrobes.size());
}
@org.junit.jupiter.api.Test
void targetHeightFromOneElement() {
Integer target = 75;
Set<Integer> elememts = Set.of(target);
WardrobeBuilder wardrobeBuilder = new WardrobeBuilder(elememts, target);
Set<List<Integer>> wardrobes = wardrobeBuilder.allCombinations();
List<Integer> wardrobe = wardrobes.iterator().next();
Integer sum = wardrobe.stream().reduce(0, Integer::sum);
assertEquals(target, sum);
}
@org.junit.jupiter.api.Test
void targetHeightSumFromTwoElements() {
Set<Integer> elememts = Set.of(50, 75);
Integer target = 125;
WardrobeBuilder wardrobeBuilder = new WardrobeBuilder(elememts, target);
Set<List<Integer>> wardrobes = wardrobeBuilder.allCombinations();
List<Integer> wardrobe = wardrobes.iterator().next();
assertEquals(2, wardrobe.size());
}
@org.junit.jupiter.api.Test
void noDuplicatesForTwoElements() {
Set<Integer> elememts = Set.of(50, 75);
Integer target = 125;
WardrobeBuilder wardrobeBuilder = new WardrobeBuilder(elememts, target);
Set<List<Integer>> wardrobes = wardrobeBuilder.allCombinations();
assertEquals(1, wardrobes.size());
}
@org.junit.jupiter.api.Test
void targetHeightPartialFromTwoElements() {
Set<Integer> elememts = Set.of(50, 75);
Integer target = 50;
WardrobeBuilder wardrobeBuilder = new WardrobeBuilder(elememts, target);
Set<List<Integer>> wardrobes = wardrobeBuilder.allCombinations();
List<Integer> wardrobe = wardrobes.iterator().next();
Integer sum = wardrobe.stream().reduce(0, Integer::sum);
assertEquals(target, sum);
void sameHeightFromOneElement() {
List<Integer> elememts = List.of(50);
List<List<Integer>> wardrobes = WardrobeBuilder.allCombinations(elememts, 50);
List<Integer> wardrobe = wardrobes.getFirst();
assertEquals(wardrobe, elememts);
}
}

16
wardrobe.iml
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@ -24,21 +24,5 @@
<SOURCES />
</library>
</orderEntry>
<orderEntry type="module-library" scope="TEST">
<library name="JUnit5.8.1">
<CLASSES>
<root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter/5.8.1/junit-jupiter-5.8.1.jar!/" />
<root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-api/5.8.1/junit-jupiter-api-5.8.1.jar!/" />
<root url="jar://$MAVEN_REPOSITORY$/org/opentest4j/opentest4j/1.2.0/opentest4j-1.2.0.jar!/" />
<root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-commons/1.8.1/junit-platform-commons-1.8.1.jar!/" />
<root url="jar://$MAVEN_REPOSITORY$/org/apiguardian/apiguardian-api/1.1.2/apiguardian-api-1.1.2.jar!/" />
<root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-params/5.8.1/junit-jupiter-params-5.8.1.jar!/" />
<root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-engine/5.8.1/junit-jupiter-engine-5.8.1.jar!/" />
<root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-engine/1.8.1/junit-platform-engine-1.8.1.jar!/" />
</CLASSES>
<JAVADOC />
<SOURCES />
</library>
</orderEntry>
</component>
</module>