From 373fb88cd81efeb5cf134b1a5b0ad955319a146f Mon Sep 17 00:00:00 2001 From: Hardik Pawar Date: Wed, 16 Oct 2024 09:24:29 +0530 Subject: [PATCH 1/5] feat: Add `GenerateSubsets` new algorithm with Junit tests --- .../bitmanipulation/GenerateSubsets.java | 44 ++++++++++++++++ .../bitmanipulation/GenerateSubsetsTest.java | 52 +++++++++++++++++++ 2 files changed, 96 insertions(+) create mode 100644 src/main/java/com/thealgorithms/bitmanipulation/GenerateSubsets.java create mode 100644 src/test/java/com/thealgorithms/bitmanipulation/GenerateSubsetsTest.java diff --git a/src/main/java/com/thealgorithms/bitmanipulation/GenerateSubsets.java b/src/main/java/com/thealgorithms/bitmanipulation/GenerateSubsets.java new file mode 100644 index 000000000000..f1b812495c1b --- /dev/null +++ b/src/main/java/com/thealgorithms/bitmanipulation/GenerateSubsets.java @@ -0,0 +1,44 @@ +package com.thealgorithms.bitmanipulation; + +import java.util.ArrayList; +import java.util.List; + +/** + * This class provides a method to generate all subsets (power set) + * of a given set using bit manipulation. + * + * @author Hardvan + */ +public final class GenerateSubsets { + private GenerateSubsets() { + } + + /** + * Generates all subsets of a given set using bit manipulation. + * Steps: + * 1. Iterate over all numbers from 0 to 2^n - 1. + * 2. For each number, iterate over all bits from 0 to n - 1. + * 3. If the i-th bit of the number is set, add the i-th element of the set to the current subset. + * 4. Add the current subset to the list of subsets. + * 5. Return the list of subsets. + * + * @param set the input set of integers + * @return a list of all subsets represented as lists of integers + */ + public static List> generateSubsets(int[] set) { + int n = set.length; + List> subsets = new ArrayList<>(); + + for (int mask = 0; mask < (1 << n); mask++) { + List subset = new ArrayList<>(); + for (int i = 0; i < n; i++) { + if ((mask & (1 << i)) != 0) { + subset.add(set[i]); + } + } + subsets.add(subset); + } + + return subsets; + } +} diff --git a/src/test/java/com/thealgorithms/bitmanipulation/GenerateSubsetsTest.java b/src/test/java/com/thealgorithms/bitmanipulation/GenerateSubsetsTest.java new file mode 100644 index 000000000000..e3205d1d0dba --- /dev/null +++ b/src/test/java/com/thealgorithms/bitmanipulation/GenerateSubsetsTest.java @@ -0,0 +1,52 @@ +package com.thealgorithms.bitmanipulation; + +import static org.junit.jupiter.api.Assertions.assertEquals; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.List; +import org.junit.jupiter.api.Test; + +class GenerateSubsetsTest { + + @Test + void testGenerateSubsetsWithTwoElements() { + int[] set = {1, 2}; + List> expected = new ArrayList<>(); + expected.add(new ArrayList<>()); + expected.add(Arrays.asList(1)); + expected.add(Arrays.asList(2)); + expected.add(Arrays.asList(1, 2)); + + List> result = GenerateSubsets.generateSubsets(set); + assertEquals(expected, result); + } + + @Test + void testGenerateSubsetsWithOneElement() { + int[] set = {3}; + List> expected = new ArrayList<>(); + expected.add(new ArrayList<>()); + expected.add(Arrays.asList(3)); + + List> result = GenerateSubsets.generateSubsets(set); + assertEquals(expected, result); + } + + @Test + void testGenerateSubsetsWithThreeElements() { + int[] set = {4, 5, 6}; + List> expected = new ArrayList<>(); + expected.add(new ArrayList<>()); + expected.add(Arrays.asList(4)); + expected.add(Arrays.asList(5)); + expected.add(Arrays.asList(4, 5)); + expected.add(Arrays.asList(6)); + expected.add(Arrays.asList(4, 6)); + expected.add(Arrays.asList(5, 6)); + expected.add(Arrays.asList(4, 5, 6)); + + List> result = GenerateSubsets.generateSubsets(set); + assertEquals(expected, result); + } +} From 33fff1b0a9ddc5439d2ffd4d72cd63c069f759b8 Mon Sep 17 00:00:00 2001 From: Hardvan Date: Wed, 16 Oct 2024 03:54:46 +0000 Subject: [PATCH 2/5] Update directory --- DIRECTORY.md | 2 ++ 1 file changed, 2 insertions(+) diff --git a/DIRECTORY.md b/DIRECTORY.md index 6429757179e9..364f6316b32e 100644 --- a/DIRECTORY.md +++ b/DIRECTORY.md @@ -31,6 +31,7 @@ * [CountLeadingZeros](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/CountLeadingZeros.java) * [CountSetBits](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/CountSetBits.java) * [FindNthBit](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/FindNthBit.java) + * [GenerateSubsets](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/GenerateSubsets.java) * [GrayCodeConversion](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/GrayCodeConversion.java) * [HammingDistance](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/HammingDistance.java) * [HigherLowerPowerOfTwo](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/HigherLowerPowerOfTwo.java) @@ -694,6 +695,7 @@ * [CountLeadingZerosTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/CountLeadingZerosTest.java) * [CountSetBitsTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/CountSetBitsTest.java) * [FindNthBitTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/FindNthBitTest.java) + * [GenerateSubsetsTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/GenerateSubsetsTest.java) * [GrayCodeConversionTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/GrayCodeConversionTest.java) * [HammingDistanceTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/HammingDistanceTest.java) * [HigherLowerPowerOfTwoTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/HigherLowerPowerOfTwoTest.java) From f7cd5f429b88c6d89f5573d6ebb4d828651ec76d Mon Sep 17 00:00:00 2001 From: Hardvan Date: Sat, 26 Oct 2024 09:46:08 +0000 Subject: [PATCH 3/5] Update directory --- DIRECTORY.md | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-) diff --git a/DIRECTORY.md b/DIRECTORY.md index 49021a9c1f38..5848cc067517 100644 --- a/DIRECTORY.md +++ b/DIRECTORY.md @@ -31,11 +31,8 @@ * [CountLeadingZeros](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/CountLeadingZeros.java) * [CountSetBits](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/CountSetBits.java) * [FindNthBit](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/FindNthBit.java) - - * [GenerateSubsets](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/GenerateSubsets.java) - * [FirstDifferentBit](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/FirstDifferentBit.java) - + * [GenerateSubsets](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/GenerateSubsets.java) * [GrayCodeConversion](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/GrayCodeConversion.java) * [HammingDistance](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/HammingDistance.java) * [HigherLowerPowerOfTwo](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/HigherLowerPowerOfTwo.java) @@ -732,11 +729,8 @@ * [CountLeadingZerosTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/CountLeadingZerosTest.java) * [CountSetBitsTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/CountSetBitsTest.java) * [FindNthBitTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/FindNthBitTest.java) - - * [GenerateSubsetsTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/GenerateSubsetsTest.java) - * [FirstDifferentBitTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/FirstDifferentBitTest.java) - + * [GenerateSubsetsTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/GenerateSubsetsTest.java) * [GrayCodeConversionTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/GrayCodeConversionTest.java) * [HammingDistanceTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/HammingDistanceTest.java) * [HigherLowerPowerOfTwoTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/HigherLowerPowerOfTwoTest.java) From 3305ce40869a96d7f28e9817e6213d41c1b09353 Mon Sep 17 00:00:00 2001 From: Hardvan Date: Sat, 26 Oct 2024 10:06:49 +0000 Subject: [PATCH 4/5] Update directory --- DIRECTORY.md | 2 ++ 1 file changed, 2 insertions(+) diff --git a/DIRECTORY.md b/DIRECTORY.md index 5848cc067517..e832b2a801e3 100644 --- a/DIRECTORY.md +++ b/DIRECTORY.md @@ -321,6 +321,7 @@ * [BresenhamLine](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/BresenhamLine.java) * [ConvexHull](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/ConvexHull.java) * [GrahamScan](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/GrahamScan.java) + * [MidpointEllipse](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/MidpointEllipse.java) * [Point](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/Point.java) * graph * [StronglyConnectedComponentOptimized](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/graph/StronglyConnectedComponentOptimized.java) @@ -969,6 +970,7 @@ * [BresenhamLineTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/geometry/BresenhamLineTest.java) * [ConvexHullTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/geometry/ConvexHullTest.java) * [GrahamScanTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/geometry/GrahamScanTest.java) + * [MidpointEllipseTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/geometry/MidpointEllipseTest.java) * graph * [StronglyConnectedComponentOptimizedTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/graph/StronglyConnectedComponentOptimizedTest.java) * greedyalgorithms From 2d9177315c4338667394e1d9f7d71b4e86a4761f Mon Sep 17 00:00:00 2001 From: siriak Date: Sat, 26 Oct 2024 11:54:48 +0000 Subject: [PATCH 5/5] Update directory --- DIRECTORY.md | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/DIRECTORY.md b/DIRECTORY.md index e832b2a801e3..783f7add88b5 100644 --- a/DIRECTORY.md +++ b/DIRECTORY.md @@ -321,6 +321,7 @@ * [BresenhamLine](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/BresenhamLine.java) * [ConvexHull](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/ConvexHull.java) * [GrahamScan](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/GrahamScan.java) + * [MidpointCircle](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/MidpointCircle.java) * [MidpointEllipse](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/MidpointEllipse.java) * [Point](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/Point.java) * graph @@ -362,6 +363,7 @@ * [Average](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/Average.java) * [BinaryPow](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/BinaryPow.java) * [BinomialCoefficient](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/BinomialCoefficient.java) + * [CatalanNumbers](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/CatalanNumbers.java) * [Ceil](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/Ceil.java) * [ChineseRemainderTheorem](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/ChineseRemainderTheorem.java) * [CircularConvolutionFFT](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/CircularConvolutionFFT.java) @@ -970,6 +972,7 @@ * [BresenhamLineTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/geometry/BresenhamLineTest.java) * [ConvexHullTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/geometry/ConvexHullTest.java) * [GrahamScanTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/geometry/GrahamScanTest.java) + * [MidpointCircleTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/geometry/MidpointCircleTest.java) * [MidpointEllipseTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/geometry/MidpointEllipseTest.java) * graph * [StronglyConnectedComponentOptimizedTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/graph/StronglyConnectedComponentOptimizedTest.java) @@ -1007,6 +1010,7 @@ * [AverageTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/AverageTest.java) * [BinaryPowTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/BinaryPowTest.java) * [BinomialCoefficientTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/BinomialCoefficientTest.java) + * [CatalanNumbersTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/CatalanNumbersTest.java) * [CeilTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/CeilTest.java) * [ChineseRemainderTheoremTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/ChineseRemainderTheoremTest.java) * [CollatzConjectureTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/CollatzConjectureTest.java)