diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..b66b8ec
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,8 @@
+build
+
+.git
+
+.gitignore
+
+.DS_Store
+
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..567609b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+build/
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..f8d0206
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,54 @@
+cmake_minimum_required(VERSION 3.16)
+project(CMakeExercise LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# CRITICAL: Add link directories BEFORE creating executable
+link_directories(/usr/local/lib)
+
+# ---------- Find Packages ----------
+# Boost (filesystem + header-only container)
+find_package(Boost REQUIRED COMPONENTS filesystem system)
+
+# deal.II (FEM)
+find_package(deal.II REQUIRED
+    HINTS ${DEAL_II_DIR} $ENV{DEAL_II_DIR}
+)
+
+# yaml-cpp (manually specify since it's in /usr/local)
+find_library(YAML_CPP_LIBRARY
+    NAMES yaml-cpp
+    PATHS /usr/local/lib
+    REQUIRED
+)
+
+# ---------- Sources ----------
+set(SOURCES
+    main.cpp
+    flatset/flatset.cpp
+    filesystem/filesystem.cpp
+    fem/fem.cpp
+    yamlParser/yamlParser.cpp
+)
+
+# ---------- Create Executable ----------
+add_executable(main ${SOURCES})
+
+# ---------- Include Directories ----------
+target_include_directories(main PRIVATE
+    ${CMAKE_CURRENT_SOURCE_DIR}
+    ${Boost_INCLUDE_DIRS}
+    /usr/local/include
+)
+
+# ---------- deal.II Setup (must come AFTER add_executable) ----------
+deal_ii_initialize_cached_variables()
+deal_ii_setup_target(main)
+
+# ---------- Link Libraries ----------
+# CRITICAL: yaml-cpp must be linked AFTER deal.II setup
+target_link_libraries(main
+    ${Boost_LIBRARIES}
+    ${YAML_CPP_LIBRARY}
+)
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..814b737
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,44 @@
+FROM ubuntu:24.04
+
+# Avoid prompts from apt
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Base tools and dev packages
+RUN apt-get update && apt-get install -y \
+    build-essential \
+    cmake \
+    unzip \
+    wget \
+    vim \
+    git \
+    libboost-all-dev \
+    libdeal.ii-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Build and install yaml-cpp v0.6.3 from source
+WORKDIR /tmp
+RUN wget --no-check-certificate https://github.com/jbeder/yaml-cpp/archive/refs/tags/yaml-cpp-0.6.3.tar.gz \
+    && tar -xzf yaml-cpp-0.6.3.tar.gz \
+    && cd yaml-cpp-yaml-cpp-0.6.3 \
+    && mkdir build \
+    && cd build \
+    && cmake -DCMAKE_BUILD_TYPE=Release -DYAML_BUILD_TESTS=OFF .. \
+    && make -j"$(nproc)" \
+    && make install \
+    && cd /tmp \
+    && rm -rf yaml-cpp-*
+
+# Make sure libraries in /usr/local/lib (yaml-cpp) are found
+ENV LD_LIBRARY_PATH=/usr/local/lib:${LD_LIBRARY_PATH:-}
+
+# Workdir for the project
+WORKDIR /workspace
+
+# Copy the repository contents
+COPY . /workspace/cmake-exercise
+
+# Switch into the exercise folder by default
+WORKDIR /workspace/cmake-exercise
+
+# Default command: drop into a shell
+CMD ["/bin/bash"]
diff --git a/main.cpp b/main.cpp
index 7588360..c70927b 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,39 +1,40 @@
-//#include "fem/fem.hpp"
-//#include "flatset/flatset.hpp"
-//#include "filesystem/filesystem.hpp"
-//#include "yamlParser/yamlParser.hpp"
+#include "fem/fem.hpp"
+#include "flatset/flatset.hpp"
+#include "filesystem/filesystem.hpp"
+#include "yamlParser/yamlParser.hpp"
+
 #include <iostream>
+#include <string>
 
 int main(int argc, char *argv[])
 {
   std::cout << "Let's fight with CMake, Docker, and some dependencies!" << std::endl << std::endl;
 
-  //std::cout << "Solve Poisson problem with FEM using deal.II" << std::endl;
-  //Fem fem;
-  //fem.run();
-  //std::cout << std::endl;
+  std::cout << "Solve Poisson problem with FEM using deal.II" << std::endl;
+  Fem fem;
+  fem.run();
+  std::cout << std::endl;
 
-  //std::cout << "Modify a flat set using boost container" << std::endl;
-  //modifyAndPrintSets();
-  //std::cout << std::endl;
+  std::cout << "Modify a flat set using boost container" << std::endl;
+  modifyAndPrintSets();
+  std::cout << std::endl;
 
-  //std::cout << "Inspect the current directory using boost filesystem" << std::endl;
-  //inspectDirectory();
-  //std::cout << std::endl;
+  std::cout << "Inspect the current directory using boost filesystem" << std::endl;
+  inspectDirectory();
+  std::cout << std::endl;
 
-  
-  //if ( argc == 2 )
-  //{
-  //  const std::string yamlFile( argv[1] );
-  //  std::cout << "Parse some yaml file with yaml-cpp" << std::endl;
-  //  std::cout << "  " << yamlFile << std::endl;
-  //  parseConfig( yamlFile );
-  //}
-  //else
-  //{
-  //  std::cout << "To parse a yaml file please specify file on command line" << std::endl;
-  //  std::cout << "  ./main YAMLFILE" << std::endl;
-  //}
+  if (argc == 2)
+  {
+    const std::string yamlFile(argv[1]);
+    std::cout << "Parse some yaml file with yaml-cpp" << std::endl;
+    std::cout << "  " << yamlFile << std::endl;
+    parseConfig(yamlFile);
+  }
+  else
+  {
+    std::cout << "To parse a yaml file please specify file on command line" << std::endl;
+    std::cout << "  ./main YAMLFILE" << std::endl;
+  }
 
   return 0;
 }