diff --git a/05/Makefile b/05/Makefile
new file mode 100644
index 0000000..2a6f68d
--- /dev/null
+++ b/05/Makefile
@@ -0,0 +1,36 @@
+# Compiler
+CXX = g++
+
+# Compiler flags
+CXXFLAGS = -Wall -g
+
+# Target executable
+TARGET = ./main
+
+# For deleting the target
+TARGET_DEL = ./main
+
+# Source files
+SRCS = src/main.cpp src/produce_database.cpp src/read_input.cpp src/merge_sort.cpp
+
+# Object files
+OBJS = $(SRCS:.cpp=.o)
+
+# Default rule to build and run the executable
+all: $(TARGET) run
+
+# Rule to link object files into the target executable
+$(TARGET): $(OBJS)
+	$(CXX) $(CXXFLAGS) -o $(TARGET) $(OBJS)
+
+# Rule to compile .cpp files into .o files
+%.o: %.cpp
+	$(CXX) $(CXXFLAGS) -c $< -o $@
+
+# Rule to run the executable
+run: $(TARGET)
+	$(TARGET)
+
+# Clean rule to remove generated files
+clean:
+	rm $(TARGET_DEL) $(OBJS)
\ No newline at end of file
diff --git a/05/src/main.cpp b/05/src/main.cpp
new file mode 100644
index 0000000..84c6ddc
--- /dev/null
+++ b/05/src/main.cpp
@@ -0,0 +1,22 @@
+/*  Filename: main.cpp
+ *  Author: Alice Winters
+ *  Created: 05/12/2025
+ */
+
+#include "produce_database.h"
+
+const std::string INPUT_FILEPATH = "input/ingredients.txt";
+
+int main()
+{
+    produce_database produce_db(INPUT_FILEPATH);
+    // produce_db.debug_fresh_ranges();
+    // produce_db.debug_available_ids();
+    produce_db.union_ranges();
+    // produce_db.debug_fresh_ranges();
+    int64_t available_fresh_ingredients = produce_db.get_available_fresh_ids();
+    std::cout << "Available fresh ingredients: " << available_fresh_ingredients << std::endl;
+    int64_t fresh_ingedients = produce_db.get_fresh_ids();
+    std::cout << "Total fresh ingredients: " << fresh_ingedients << std::endl;
+    return 0;
+}
diff --git a/05/src/merge_sort.cpp b/05/src/merge_sort.cpp
new file mode 100644
index 0000000..1ed496a
--- /dev/null
+++ b/05/src/merge_sort.cpp
@@ -0,0 +1,77 @@
+// Credit: https://www.geeksforgeeks.org/cpp/cpp-program-for-merge-sort/
+// C++ program for the implementation of merge sort
+#include "merge_sort.h"
+
+using namespace std;
+
+// Merges two subarrays of vec.
+// First subarray is vec[left..mid]
+// Second subarray is vec[mid+1..right]
+void merge(vector<tuple<int64_t, int64_t>> &vec, int left, int mid, int right)
+{
+    int i, j, k;
+    int n1 = mid - left + 1;
+    int n2 = right - mid;
+
+    // Create temporary vectors
+    vector<tuple<int64_t, int64_t>> leftVec(n1), rightVec(n2);
+
+    // Copy data to temporary vectors
+    for (i = 0; i < n1; i++)
+        leftVec[i] = vec[left + i];
+    for (j = 0; j < n2; j++)
+        rightVec[j] = vec[mid + 1 + j];
+
+    // Merge the temporary vectors back into vec[left..right]
+    i = 0;
+    j = 0;
+    k = left;
+    while (i < n1 && j < n2)
+    {
+        if (get<0>(leftVec[i]) <= get<0>(rightVec[j]))
+        {
+            vec[k] = leftVec[i];
+            i++;
+        }
+        else
+        {
+            vec[k] = rightVec[j];
+            j++;
+        }
+        k++;
+    }
+
+    // Copy the remaining elements of leftVec[], if any
+    while (i < n1)
+    {
+        vec[k] = leftVec[i];
+        i++;
+        k++;
+    }
+
+    // Copy the remaining elements of rightVec[], if any
+    while (j < n2)
+    {
+        vec[k] = rightVec[j];
+        j++;
+        k++;
+    }
+}
+
+// The subarray to be sorted is in the index range [left..right]
+void mergeSort(vector<tuple<int64_t, int64_t>> &vec, int left, int right)
+{
+    if (left < right)
+    {
+
+        // Calculate the midpoint
+        int mid = left + (right - left) / 2;
+
+        // Sort first and second halves
+        mergeSort(vec, left, mid);
+        mergeSort(vec, mid + 1, right);
+
+        // Merge the sorted halves
+        merge(vec, left, mid, right);
+    }
+}
\ No newline at end of file
diff --git a/05/src/merge_sort.h b/05/src/merge_sort.h
new file mode 100644
index 0000000..382df39
--- /dev/null
+++ b/05/src/merge_sort.h
@@ -0,0 +1,13 @@
+#ifndef MERGE_SORT_H
+
+#define MERGE_SORT_H
+
+#include <iostream>
+#include <vector>
+#include <tuple>
+#include <stdint.h>
+
+void merge(std::vector<std::tuple<int64_t, int64_t>> &vec, int left, int mid, int right);
+void mergeSort(std::vector<std::tuple<int64_t, int64_t>> &vec, int left, int right);
+
+#endif
\ No newline at end of file
diff --git a/05/src/produce_database.cpp b/05/src/produce_database.cpp
new file mode 100644
index 0000000..232faa7
--- /dev/null
+++ b/05/src/produce_database.cpp
@@ -0,0 +1,136 @@
+#include "produce_database.h"
+#include "read_input.h"
+#include "merge_sort.h"
+
+void produce_database::parse_input(std::vector<std::string> input_ranges, std::vector<std::string> input_ids)
+{
+    std::string temp_string;
+    std::tuple<int64_t, int64_t> temp_tuple;
+    for (int i = 0; i < (int)input_ranges.size(); i++)
+    {
+        temp_string = "";
+        for (int j = 0; j < (int)input_ranges[i].size(); j++)
+        {
+            if (input_ranges[i][j] == '-')
+            {
+                std::get<0>(temp_tuple) = std::stoll(temp_string);
+                temp_string = "";
+                continue;
+            }
+            temp_string.push_back(input_ranges[i][j]);
+        }
+        std::get<1>(temp_tuple) = std::stoll(temp_string);
+        this->fresh_ingredient_id_ranges.push_back(temp_tuple);
+    }
+
+    for (int i = 0; i < (int)input_ids.size(); i++)
+    {
+        this->available_ingredient_ids.push_back(std::stoll(input_ids[i]));
+    }
+
+    return;
+}
+
+produce_database::produce_database(std::string filename)
+{
+    std::tuple<std::vector<std::string>, std::vector<std::string>> input = read_input_from_file(filename);
+    this->parse_input(std::get<0>(input), std::get<1>(input));
+}
+
+int produce_database::get_fresh_ranges_size()
+{
+    return this->fresh_ingredient_id_ranges.size();
+}
+
+std::tuple<int64_t, int64_t> produce_database::get_fresh_range_from_index(int index)
+{
+    return this->fresh_ingredient_id_ranges[index];
+}
+
+int produce_database::get_available_ids_size()
+{
+    return this->available_ingredient_ids.size();
+}
+
+int64_t produce_database::get_available_id_from_index(int index)
+{
+    return this->available_ingredient_ids[index];
+}
+
+void produce_database::debug_fresh_ranges()
+{
+    for (int i = 0; i < (int)this->get_fresh_ranges_size(); i++)
+    {
+        std::cout << std::get<0>(this->get_fresh_range_from_index(i));
+        std::cout << "-";
+        std::cout << std::get<1>(this->get_fresh_range_from_index(i));
+        std::cout << std::endl;
+    }
+}
+
+void produce_database::debug_available_ids()
+{
+    for (int i = 0; i < (int)this->get_available_ids_size(); i++)
+    {
+        std::cout << this->get_available_id_from_index(i) << std::endl;
+    }
+}
+
+void produce_database::union_ranges()
+{
+    mergeSort(this->fresh_ingredient_id_ranges, 0, (int)this->fresh_ingredient_id_ranges.size() - 1);
+
+    std::tuple<int64_t, int64_t> temp_tuple = this->fresh_ingredient_id_ranges[0];
+    std::vector<std::tuple<int64_t, int64_t>> unioned_ranges;
+    for (int i = 1; i < (int)this->get_fresh_ranges_size(); i++)
+    {
+        if (std::get<1>(temp_tuple) > std::get<1>(this->fresh_ingredient_id_ranges[i]))
+        {
+            continue;
+        }
+        if (std::get<1>(temp_tuple) < std::get<0>(this->fresh_ingredient_id_ranges[i]))
+        {
+            std::cout << std::get<0>(temp_tuple) << "-" << std::get<1>(temp_tuple) << std::endl;
+            unioned_ranges.push_back(temp_tuple);
+            temp_tuple = this->fresh_ingredient_id_ranges[i];
+            continue;
+        }
+        std::get<1>(temp_tuple) = std::get<1>(this->fresh_ingredient_id_ranges[i]);
+    }
+    unioned_ranges.push_back(temp_tuple);
+
+    this->fresh_ingredient_id_ranges = unioned_ranges;
+
+    return;
+}
+
+int64_t produce_database::get_available_fresh_ids()
+{
+    int count = 0;
+
+    for (int i = 0; i < (int)this->available_ingredient_ids.size(); i++)
+    {
+        for (int j = 0; j < (int)this->fresh_ingredient_id_ranges.size(); j++)
+        {
+            if (this->available_ingredient_ids[i] >= std::get<0>(this->fresh_ingredient_id_ranges[j]) && this->available_ingredient_ids[i] <= std::get<1>(this->fresh_ingredient_id_ranges[j]))
+            {
+                ++count;
+                break;
+            }
+        }
+    }
+
+    return count;
+}
+
+int64_t produce_database::get_fresh_ids()
+{
+    int64_t sum = 0;
+
+    for (int i = 0; i < (int)this->fresh_ingredient_id_ranges.size(); i++)
+    {
+        sum += std::get<1>(this->fresh_ingredient_id_ranges[i]) - std::get<0>(this->fresh_ingredient_id_ranges[i]) + 1;
+    }
+
+    return sum;
+}
\ No newline at end of file
diff --git a/05/src/produce_database.h b/05/src/produce_database.h
new file mode 100644
index 0000000..881e49f
--- /dev/null
+++ b/05/src/produce_database.h
@@ -0,0 +1,30 @@
+#ifndef PRODUCE_DATABASE_H
+
+#define PRODUCE_DATABASE_H
+
+#include <vector>
+#include <string>
+#include <iostream>
+#include <stdint.h>
+
+class produce_database
+{
+private:
+    std::vector<std::tuple<int64_t, int64_t>> fresh_ingredient_id_ranges;
+    std::vector<int64_t> available_ingredient_ids;
+    void parse_input(std::vector<std::string> input_ranges, std::vector<std::string> input_ids);
+
+public:
+    produce_database(std::string filename);
+    int get_fresh_ranges_size();
+    std::tuple<int64_t, int64_t> get_fresh_range_from_index(int index);
+    int get_available_ids_size();
+    int64_t get_available_id_from_index(int index);
+    void debug_fresh_ranges();
+    void debug_available_ids();
+    void union_ranges();
+    int64_t get_available_fresh_ids();
+    int64_t get_fresh_ids();
+};
+
+#endif
\ No newline at end of file
diff --git a/05/src/read_input.cpp b/05/src/read_input.cpp
new file mode 100644
index 0000000..f3f8f15
--- /dev/null
+++ b/05/src/read_input.cpp
@@ -0,0 +1,30 @@
+#include "read_input.h"
+
+using namespace std;
+
+tuple<vector<string>, vector<string>> read_input_from_file(string filepath)
+{
+    vector<string> ranges;
+    vector<string> ids;
+    ifstream input_file(filepath);
+    string input_buffer = " ";
+    bool is_after_ranges = false;
+    while (getline(input_file, input_buffer))
+    {
+        if (input_buffer == "")
+        {
+            is_after_ranges = true;
+            continue;
+        }
+        if (is_after_ranges)
+        {
+            ids.push_back(input_buffer);
+            continue;
+        }
+        ranges.push_back(input_buffer);
+    }
+    input_file.close();
+
+    tuple<vector<string>, vector<string>> output(ranges, ids);
+    return output;
+}
\ No newline at end of file
diff --git a/05/src/read_input.h b/05/src/read_input.h
new file mode 100644
index 0000000..b856a2f
--- /dev/null
+++ b/05/src/read_input.h
@@ -0,0 +1,14 @@
+#ifndef READ_INPUT_H
+
+#define READ_INPUT_H
+
+#include <fstream>
+#include <iostream>
+#include <vector>
+#include <string>
+#include <tuple>
+#include "produce_database.h"
+
+std::tuple<std::vector<std::string>, std::vector<std::string>> read_input_from_file(std::string filepath);
+
+#endif
\ No newline at end of file