Merge pull request #89 from Debashis08/feature-dp-implementation

feature: house robber 1 solution added

Author: Debashis08

include/0005_DynamicProgramming/0005_HouseRobber1.h

@@ -0,0 +1,25 @@
+#pragma once
+#include<vector>
+using namespace std;
+
+/*
+Pattern 1
+Linear Recurrence
+
+Description
+There are n houses built in a line, each of which contains some money in it.
+A robber wants to steal money from these houses, but he can’t steal from two adjacent houses. The task is to find the maximum amount of money which can be stolen.
+
+*/
+
+namespace HouseRobber1
+{
+	class DynamicProgramming
+	{
+	private:
+		int MaxLootRecursive(int house, vector<int>& houseValues);
+	public:
+		int RecursiveMaximumLoot(vector<int>& houseValues);
+		int DpMaximumLoot(vector<int>& houseValues);
+	};
+}

source/0005_DynamicProgramming/0005_HouseRobber1.cc

@@ -0,0 +1,44 @@
+#include "../../include/0005_DynamicProgramming/0005_HouseRobber1.h"
+
+namespace HouseRobber1
+{
+	int DynamicProgramming::MaxLootRecursive(int house, vector<int>& houseValues)
+	{
+		if (house <= 0)
+		{
+			return 0;
+		}
+
+		if (house == 1)
+		{
+			return houseValues[0];
+		}
+
+		int pickCurrentHouse = houseValues[house - 1] + this->MaxLootRecursive(house - 2, houseValues);
+		int dropCurrentHouse = this->MaxLootRecursive(house - 1, houseValues);
+
+		return max(pickCurrentHouse, dropCurrentHouse);
+	}
+
+	int DynamicProgramming::RecursiveMaximumLoot(vector<int>& houseValues)
+	{
+		int totalNumberOfHouses = houseValues.size();
+		return this->MaxLootRecursive(totalNumberOfHouses, houseValues);
+	}
+
+	int DynamicProgramming::DpMaximumLoot(vector<int>& houseValues)
+	{
+		int totalNumberOfHouses = houseValues.size();
+		vector<int> dp(totalNumberOfHouses + 1, 0);
+
+		dp[0] = 0;
+		dp[1] = houseValues[0];
+
+		for (int i = 2; i <= totalNumberOfHouses; i++)
+		{
+			dp[i] = max(dp[i - 2] + houseValues[i - 1], dp[i - 1]);
+		}
+
+		return dp[totalNumberOfHouses];
+	}
+}

source/0005_DynamicProgramming/CMakeLists.txt

@@ -4,6 +4,7 @@ set(0005DYNAMICPROGRAMMING_SOURCES
     0002_TribonacciNumber.cc
     0003_ClimbingStairs.cc
     0004_MinimumCostClimbingStairs.cc
+    0005_HouseRobber1.cc
 
 )
 

test/0005_DynamicProgramming/0005_HouseRobber1Test.cc

@@ -0,0 +1,33 @@
+#include<gtest/gtest.h>
+#include "../../include/0005_DynamicProgramming/0005_HouseRobber1.h"
+
+namespace HouseRobber1
+{
+	TEST(HouseRobber1, RecursionTest)
+	{
+		// Arrange
+		DynamicProgramming dp;
+		vector<int> houseValues = { 6, 7, 1, 3, 8, 2, 4 };
+		int expectedMaximumLoot = 19;
+
+		// Act
+		int actualMaximumLoot = dp.RecursiveMaximumLoot(houseValues);
+
+		// Assert
+		ASSERT_EQ(expectedMaximumLoot, actualMaximumLoot);
+	}
+
+	TEST(HouseRobber1, DpTest)
+	{
+		// Arrange
+		DynamicProgramming dp;
+		vector<int> houseValues = { 6, 7, 1, 3, 8, 2, 4 };
+		int expectedMaximumLoot = 19;
+
+		// Act
+		int actualMaximumLoot = dp.DpMaximumLoot(houseValues);
+
+		// Assert
+		ASSERT_EQ(expectedMaximumLoot, actualMaximumLoot);
+	}
+}

test/0005_DynamicProgramming/CMakeLists.txt

@@ -18,6 +18,7 @@ add_executable(
   0002_TribonacciNumberTest.cc
   0003_ClimbingStairsTest.cc
   0004_MinimumCostClimbingStairsTest.cc
+  0005_HouseRobber1Test.cc
 
 )