Merge pull request #81 from Debashis08/feature-dp-implementation

Feature dp implementation

Author: Debashis08

include/0005_DynamicProgramming/0001_RodCutting.h

@@ -0,0 +1,19 @@
+#pragma once
+#include<iostream>
+#include<vector>
+using namespace std;
+
+namespace RodCutting
+{
+	class DynamicProgramming
+	{
+	private:
+		int _totalLength;
+		vector<int> _price;
+		vector<int> _cutPositions;
+	public:
+		DynamicProgramming(vector<int> price);
+		int RecursiveRodCutting(int length);
+		pair<int, vector<int>> DpGetMaximumProfitWithCuts(int length);
+	};
+}

source/0005_DynamicProgramming/0001_RodCutting.cc

@@ -0,0 +1,61 @@
+#include "../../include/0005_DynamicProgramming/0001_RodCutting.h"
+#include<iostream>
+#include<vector>
+using namespace std;
+
+namespace RodCutting
+{
+	DynamicProgramming::DynamicProgramming(vector<int> price)
+	{
+		this->_price = price;
+		this->_totalLength = this->_price.size();
+	}
+
+	int DynamicProgramming::RecursiveRodCutting(int length)
+	{
+		// Base case
+		if (length == 0)
+		{
+			return 0;
+		}
+
+		int result = 0;
+
+		for (int cut = 1; cut <= length; cut++)
+		{
+			result = max(result, this->_price[cut - 1] + this->RecursiveRodCutting(length - cut));
+		}
+
+		return result;
+	}
+
+	pair<int, vector<int>> DynamicProgramming::DpGetMaximumProfitWithCuts(int length)
+	{
+		vector<int> dp(this->_price.size() + 1, 0);
+		this->_cutPositions = vector<int>(this->_price.size() + 1, 0);
+
+		// Find maximum value for all rod of length i.
+		for (int i = 1; i <= this->_totalLength; i++)
+		{
+			for (int j = 1; j <= i; j++)
+			{
+				if (dp[i] < (this->_price[j - 1] + dp[i - j]))
+				{
+					dp[i] = this->_price[j - 1] + dp[i - j];
+					this->_cutPositions[i] = j - 1;
+				}
+			}
+		}
+
+		// Re-construct the cuts
+		vector<int> cutLengths;
+		int currentLength = length;
+		while (currentLength > 0)
+		{
+			cutLengths.push_back(this->_cutPositions[currentLength] + 1);
+			currentLength -= cutLengths.back();
+		}
+
+		return { dp[length] ,cutLengths };
+	}
+}

source/0005_DynamicProgramming/CMakeLists.txt

@@ -0,0 +1,8 @@
+# Specify the source files
+set(0005DYNAMICPROGRAMMING_SOURCES
+    0001_RodCutting.cc
+
+)
+
+# Create a library target
+add_library(0005DYNAMICPROGRAMMING ${0005DYNAMICPROGRAMMING_SOURCES})

test/0005_DynamicProgramming/0001_RodCuttingTest.cc

@@ -0,0 +1,40 @@
+#include<gtest/gtest.h>
+#include "../../include/0005_DynamicProgramming/0001_RodCutting.h"
+#include "../0000_CommonUtilities/UnitTestHelper.h"
+
+namespace RodCutting
+{
+	UnitTestHelper unitTestHelper;
+
+	TEST(DpRodCutting, RecursiveTest)
+	{
+		// Arrange
+		vector<int> price = { 1, 5, 8, 9, 10, 17, 17, 20, 24, 30 };
+		int length = 8;
+		DynamicProgramming dp(price);
+		int expectedResult = 22;
+
+		// Act
+		int actualResult = dp.RecursiveRodCutting(length);
+
+		// Assert
+		ASSERT_EQ(actualResult, expectedResult);
+	}
+
+	TEST(DpRodCutting, DpTest)
+	{
+		// Arrange
+		vector<int> price = { 1, 5, 8, 9, 10, 17, 17, 20, 24, 30 };
+		int length = 8;
+		DynamicProgramming dp(price);
+		int expectedProfit = 22;
+		vector<int> expectedCuts = { 2, 6 };
+
+		// Act
+		pair<int, vector<int>> actualResult = dp.DpGetMaximumProfitWithCuts(length);
+
+		// Assert
+		ASSERT_EQ(actualResult.first, expectedProfit);
+		ASSERT_EQ(actualResult.second, expectedCuts);
+	}
+}

test/0005_DynamicProgramming/CMakeLists.txt

@@ -0,0 +1,33 @@
+cmake_policy(SET CMP0135 NEW)
+
+include(FetchContent)
+FetchContent_Declare(
+  googletest
+  URL https://github.com/google/googletest/archive/03597a01ee50ed33e9dfd640b249b4be3799d395.zip
+)
+
+# For Windows: Prevent overriding the parent project's compiler/linker settings
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+FetchContent_MakeAvailable(googletest)
+
+enable_testing()
+
+add_executable(
+  0005DynamicProgrammingTests
+  0001_RodCuttingTest.cc
+  
+)
+
+target_link_libraries(
+  0005DynamicProgrammingTests
+  GTest::gtest_main
+  0005DYNAMICPROGRAMMING
+)
+
+# Add .clang-tidy configuration to this library.
+if(CLANG_TIDY_EXE)
+  set_target_properties(0005DYNAMICPROGRAMMING PROPERTIES CXX_CLANG_TIDY "${CLANG_TIDY_COMMAND}")
+endif()
+
+include(GoogleTest)
+gtest_discover_tests(0005DynamicProgrammingTests DISCOVERY_TIMEOUT 30)