From 5f5819225ac7139e65c7ecf42fcd6826635527c1 Mon Sep 17 00:00:00 2001 From: Hardik Pawar Date: Mon, 14 Oct 2024 15:45:07 +0530 Subject: [PATCH 1/5] feat: Add `BandwidthAllocation` new algorithm with Junit tests --- .../greedyalgorithms/BandwidthAllocation.java | 58 +++++++++++++++++++ .../BandwidthAllocationTest.java | 22 +++++++ 2 files changed, 80 insertions(+) create mode 100644 src/main/java/com/thealgorithms/greedyalgorithms/BandwidthAllocation.java create mode 100644 src/test/java/com/thealgorithms/greedyalgorithms/BandwidthAllocationTest.java diff --git a/src/main/java/com/thealgorithms/greedyalgorithms/BandwidthAllocation.java b/src/main/java/com/thealgorithms/greedyalgorithms/BandwidthAllocation.java new file mode 100644 index 000000000000..f831aab15a8c --- /dev/null +++ b/src/main/java/com/thealgorithms/greedyalgorithms/BandwidthAllocation.java @@ -0,0 +1,58 @@ +package com.thealgorithms.greedyalgorithms; + +import java.util.Arrays; + +/** + * Class to solve the Bandwidth Allocation Problem. + * The goal is to maximize the value gained by allocating bandwidth to users. + * Example: + * Bandwidth = 10 + * Users = [3, 5, 7] + * Values = [10, 20, 30] + * The maximum value achievable is 40 by allocating 3 units to user 0 and 7 units to user 2. + * + * @author Hardvan + */ +public final class BandwidthAllocation { + private BandwidthAllocation() { + } + + /** + * Allocates bandwidth to maximize value. + * Steps: + * 1. Calculate the ratio of value/demand for each user. + * 2. Sort the users in descending order of the ratio. + * 3. Allocate bandwidth to users in order of the sorted list. + * 4. If the bandwidth is not enough to allocate the full demand of a user, allocate a fraction of the demand. + * 5. Return the maximum value achievable. + * + * @param bandwidth total available bandwidth + * @param users array of user demands + * @param values array of values associated with each user's demand + * @return the maximum value achievable + */ + public static int maxValue(int bandwidth, int[] users, int[] values) { + int n = users.length; + double[][] ratio = new double[n][2]; // {index, ratio} + + for (int i = 0; i < n; i++) { + ratio[i][0] = i; + ratio[i][1] = (double) values[i] / users[i]; + } + + Arrays.sort(ratio, (a, b) -> Double.compare(b[1], a[1])); + + int maxValue = 0; + for (int i = 0; i < n; i++) { + int index = (int) ratio[i][0]; + if (bandwidth >= users[index]) { + maxValue += values[index]; + bandwidth -= users[index]; + } else { + maxValue += (int) (ratio[i][1] * bandwidth); + break; + } + } + return maxValue; + } +} diff --git a/src/test/java/com/thealgorithms/greedyalgorithms/BandwidthAllocationTest.java b/src/test/java/com/thealgorithms/greedyalgorithms/BandwidthAllocationTest.java new file mode 100644 index 000000000000..452f7858c162 --- /dev/null +++ b/src/test/java/com/thealgorithms/greedyalgorithms/BandwidthAllocationTest.java @@ -0,0 +1,22 @@ +package com.thealgorithms.greedyalgorithms; + +import static org.junit.jupiter.api.Assertions.assertEquals; + +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 BandwidthAllocationTest { + + @ParameterizedTest + @MethodSource("bandwidthProvider") + public void testMaxValue(int capacity, int[] bandwidths, int[] values, int expected) { + assertEquals(expected, BandwidthAllocation.maxValue(capacity, bandwidths, values)); + } + + private static Stream bandwidthProvider() { + return Stream.of(Arguments.of(50, new int[] {20, 10, 30}, new int[] {40, 20, 30}, 80), Arguments.of(0, new int[] {5, 10}, new int[] {10, 20}, 0), Arguments.of(5, new int[] {5, 10}, new int[] {10, 20}, 10), Arguments.of(15, new int[] {10, 20}, new int[] {10, 25}, 18), + Arguments.of(25, new int[] {10, 15, 20}, new int[] {10, 30, 50}, 60)); + } +} From a8357227bfbf3c02a3fc362c2e8b442059c42159 Mon Sep 17 00:00:00 2001 From: Hardvan Date: Mon, 14 Oct 2024 10:15:24 +0000 Subject: [PATCH 2/5] Update directory --- DIRECTORY.md | 2 ++ 1 file changed, 2 insertions(+) diff --git a/DIRECTORY.md b/DIRECTORY.md index f354913a05e8..bc4cf2c27082 100644 --- a/DIRECTORY.md +++ b/DIRECTORY.md @@ -307,6 +307,7 @@ * [GrahamScan](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/GrahamScan.java) * greedyalgorithms * [ActivitySelection](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/greedyalgorithms/ActivitySelection.java) + * [BandwidthAllocation](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/greedyalgorithms/BandwidthAllocation.java) * [BinaryAddition](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/greedyalgorithms/BinaryAddition.java) * [CoinChange](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/greedyalgorithms/CoinChange.java) * [DigitSeparation](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/greedyalgorithms/DigitSeparation.java) @@ -899,6 +900,7 @@ * [GrahamScanTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/geometry/GrahamScanTest.java) * greedyalgorithms * [ActivitySelectionTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/greedyalgorithms/ActivitySelectionTest.java) + * [BandwidthAllocationTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/greedyalgorithms/BandwidthAllocationTest.java) * [BinaryAdditionTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/greedyalgorithms/BinaryAdditionTest.java) * [CoinChangeTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/greedyalgorithms/CoinChangeTest.java) * [DigitSeparationTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/greedyalgorithms/DigitSeparationTest.java) From 71425b2df3fc5a6670f42db47d2796b48b50e43a Mon Sep 17 00:00:00 2001 From: Hardik Pawar Date: Mon, 14 Oct 2024 15:48:39 +0530 Subject: [PATCH 3/5] Fix --- .../com/thealgorithms/greedyalgorithms/BandwidthAllocation.java | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/main/java/com/thealgorithms/greedyalgorithms/BandwidthAllocation.java b/src/main/java/com/thealgorithms/greedyalgorithms/BandwidthAllocation.java index f831aab15a8c..602cdcd5ad40 100644 --- a/src/main/java/com/thealgorithms/greedyalgorithms/BandwidthAllocation.java +++ b/src/main/java/com/thealgorithms/greedyalgorithms/BandwidthAllocation.java @@ -26,7 +26,7 @@ private BandwidthAllocation() { * 4. If the bandwidth is not enough to allocate the full demand of a user, allocate a fraction of the demand. * 5. Return the maximum value achievable. * - * @param bandwidth total available bandwidth + * @param bandwidth total available bandwidth to allocate * @param users array of user demands * @param values array of values associated with each user's demand * @return the maximum value achievable From d9a4f113d3bf801165697adf19d190a36ffaf607 Mon Sep 17 00:00:00 2001 From: siriak Date: Fri, 25 Oct 2024 20:39:54 +0000 Subject: [PATCH 4/5] Update directory --- DIRECTORY.md | 2 ++ 1 file changed, 2 insertions(+) diff --git a/DIRECTORY.md b/DIRECTORY.md index 549bc1f89f14..c066aae524d9 100644 --- a/DIRECTORY.md +++ b/DIRECTORY.md @@ -572,6 +572,7 @@ * [UnionFind](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/searches/UnionFind.java) * [UpperBound](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/searches/UpperBound.java) * slidingwindow + * [LongestSubstringWithoutRepeatingCharacters](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/slidingwindow/LongestSubstringWithoutRepeatingCharacters.java) * [MaxSumKSizeSubarray](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/slidingwindow/MaxSumKSizeSubarray.java) * sorts * [AdaptiveMergeSort](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/sorts/AdaptiveMergeSort.java) @@ -1165,6 +1166,7 @@ * [UnionFindTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/searches/UnionFindTest.java) * [UpperBoundTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/searches/UpperBoundTest.java) * slidingwindow + * [LongestSubstringWithoutRepeatingCharactersTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/slidingwindow/LongestSubstringWithoutRepeatingCharactersTest.java) * [MaxSumKSizeSubarrayTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/slidingwindow/MaxSumKSizeSubarrayTest.java) * sorts * [AdaptiveMergeSortTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/sorts/AdaptiveMergeSortTest.java) From 357f186e7880697c4f88bc38d691dfd414edf8e1 Mon Sep 17 00:00:00 2001 From: siriak Date: Sat, 26 Oct 2024 11:59:21 +0000 Subject: [PATCH 5/5] Update directory --- DIRECTORY.md | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/DIRECTORY.md b/DIRECTORY.md index f9d1727524a1..b7707a254ab6 100644 --- a/DIRECTORY.md +++ b/DIRECTORY.md @@ -320,6 +320,8 @@ * [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 * [StronglyConnectedComponentOptimized](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/graph/StronglyConnectedComponentOptimized.java) @@ -361,6 +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) @@ -968,6 +971,8 @@ * [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) * greedyalgorithms @@ -1005,6 +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)