diff --git a/CMakeLists.txt b/CMakeLists.txt
index f6bd1f5..df4e7a2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,3 +23,5 @@ add_executable(main src/menu.cpp
         src/clusterCutSize.h src/clusterCutSize.cpp src/output.cpp)
 
 add_executable(testColoring src/testColoring.cpp src/parallel_coarsening.cpp src/Graph.cpp src/Graph.h)
+
+add_executable(readBin src/tools/read_bin.cpp)
\ No newline at end of file
diff --git a/src/Graph.cpp b/src/Graph.cpp
index 1067282..de72225 100644
--- a/src/Graph.cpp
+++ b/src/Graph.cpp
@@ -3,7 +3,7 @@
 
 using namespace std;
 
-Node::Node(int id, int weight) {
+Node::Node(unsigned int id,unsigned int weight) {
     this->id     = id;
     this->weight = weight;
     child        = nullptr;
@@ -19,28 +19,28 @@ vector<Node *> Node::get_neighbors() {
     return neighbors;
 }
 
-Edge::Edge(int weight, Node *node1, Node *node2) {
+Edge::Edge(unsigned int weight, Node *node1, Node *node2) {
     this->weight = weight;
     this->node1  = node1;
     this->node2  = node2;
     this->flag   = false;
 }
 
-Node *Graph::add_node(int id, int weight) {
+Node *Graph::add_node( unsigned int id, unsigned int weight) {
     Node *n = new Node(id, weight);
     nodes.push_back(n);
     this->node_weight_global += weight;
     return n;
 }
 
-Node *Graph::add_node_with_index(int id, int weight) {
+Node *Graph::add_node_with_index( unsigned int id, unsigned int weight) {
     Node *n = new Node(id, weight);
     nodes[id] = n;
     this->node_weight_global += weight;
     return n;
 }
 
-shared_ptr<Edge> Graph::add_edge(int source, int dest, int distance) {
+shared_ptr<Edge> Graph::add_edge(unsigned int source, unsigned int dest, unsigned int distance) {
     Node *node1        = nodes[source];
     Node *node2        = nodes[dest];
     shared_ptr<Edge> e = make_shared<Edge>(distance, node1, node2);
@@ -56,7 +56,7 @@ void Graph::print() {
         Node *n = nodes[i];
         cout << "Node " << n->id << " with weight " << n->weight << endl;
         for (auto &edge : n->edges) {
-            int source, dest;
+            unsigned int source, dest;
             source = edge->node1->id;
             dest   = edge->node2->id;
             if (source != n->id)
@@ -97,10 +97,10 @@ int Graph::max_node_degree() {
     return _max_node_degree;
 }
 
-int Graph::V(){
+unsigned int Graph::V() const{
     return (int)nodes.size();
 }
 
-int Graph::E(){
+unsigned long Graph::E(){
     return (int)edges.size();
 }
\ No newline at end of file
diff --git a/src/Graph.h b/src/Graph.h
index 4b47108..11e26fd 100644
--- a/src/Graph.h
+++ b/src/Graph.h
@@ -9,35 +9,35 @@
 using namespace std;
 
 struct Node {
-    Node(int id, int weight);
-    int id;
-    int weight;
+    Node(unsigned int id, unsigned int weight);
+    unsigned int id;
+    unsigned int weight;
     Node *child;
     vector<shared_ptr<struct Edge>> edges;
     vector<Node *> get_neighbors();
 };
 
 struct Edge {
-    Edge(int weight, Node *node1, Node *node2);
-    int weight;
+    Edge(unsigned int weight, Node *node1, Node *node2);
+    unsigned int weight;
     Node *node1;
     Node *node2;
     bool flag;
 };
 
 struct Graph {
-    int V();                    // nodes_num
-    int E();                    // edges_num
-    int node_weight_global = 0;
-    int _max_node_degree   = 0;
-    int num_colours        = 0;
+    unsigned int V() const;                    // nodes_num
+    unsigned long E();                    // edges_num
+    unsigned int node_weight_global = 0;
+    unsigned int _max_node_degree   = 0;
+    unsigned int num_colours        = 0;
     vector<int> colours;
     vector<int> partitions_size;
     vector<Node *> nodes;
     vector<shared_ptr<Edge>> edges;
-    Node *add_node(int id, int weight);
-    Node *add_node_with_index(int id, int weight);
-    shared_ptr<Edge> add_edge(int source, int dest, int distance);
+    Node *add_node(unsigned int id, unsigned int weight);
+    Node *add_node_with_index(unsigned int id, unsigned int weight);
+    shared_ptr<Edge> add_edge(unsigned int source, unsigned int dest, unsigned int distance);
     void print();
     void add_or_sum_edge(Node *n1, Node *n2, int distance);
     int max_node_degree();
diff --git a/src/loader.cpp b/src/loader.cpp
index 12bf94e..ba546ab 100644
--- a/src/loader.cpp
+++ b/src/loader.cpp
@@ -9,13 +9,14 @@
 using namespace std;
 
 struct m_edge{
-    int node1;
-    int node2;
-    int weight;
+    unsigned int node1;
+    unsigned int node2;
+    unsigned int weight;
 };
-void thread_reader(Graph*g, const int*filedata, int num_nodes, int num_edges, int start, int step, barrier<>& bar, mutex& mtx_e);
+void thread_reader(Graph*g, const unsigned int*filedata, unsigned int num_nodes, unsigned long num_edges, int start, int step, barrier<>& bar, mutex& mtx_e);
+
+Graph* loadFromFile(const string& path) {
 
-Graph* loadFromFile(string path) {
     int num_threads = 4;
     auto start_time = chrono::high_resolution_clock::now();
     int fd = open(path.c_str(), O_RDONLY);
@@ -28,13 +29,13 @@ Graph* loadFromFile(string path) {
         throw std::runtime_error("Impossible to get file size");
     }
 
-    int* intData = static_cast<int*>(mmap(nullptr, fileStat.st_size, PROT_READ, MAP_PRIVATE, fd, 0));
+    auto intData = static_cast<unsigned int*>(mmap(nullptr, fileStat.st_size, PROT_READ, MAP_PRIVATE, fd, 0));
     if (intData == MAP_FAILED) {
         throw std::runtime_error("Impossible to map file");
     }
 
-    int num_nodes = intData[0];
-    int num_edges = intData[1];
+    auto num_nodes = intData[0];
+    auto num_edges = static_cast<unsigned long>(intData[2]) << 32 | intData[1];
 
     auto* g = new Graph();
     g->nodes.resize(num_nodes);
@@ -42,6 +43,8 @@ Graph* loadFromFile(string path) {
     vector<thread> readers(num_threads);
     barrier bar(num_threads);
     mutex mtx_e;
+
+
     for(int i = 0; i<num_threads; i++){
         readers[i] = thread(thread_reader, g, intData, num_nodes, num_edges, i, num_threads, ref(bar), ref(mtx_e));
     }
@@ -61,13 +64,13 @@ Graph* loadFromFile(string path) {
 
 
 
-void thread_reader(Graph*g, const int*filedata, int num_nodes, int num_edges, int start, int step, barrier<>& bar, mutex& mtx_e){
+void thread_reader(Graph*g, const unsigned int*filedata, unsigned int num_nodes, unsigned long num_edges, int start, int step, barrier<>& bar, mutex& mtx_e){
 
 
-    int n_id;
-    int n_weight;
-    int cursor = start*2 + 2;
-    while(cursor< num_nodes*2 + 2){
+    unsigned int n_id;
+    unsigned int n_weight;
+    unsigned int cursor = start*2 + 3;
+    while(cursor< num_nodes*2 + 3){
         n_id = filedata[cursor];
         n_weight = filedata[cursor+1];
         g->add_node_with_index(n_id, n_weight);
@@ -76,8 +79,8 @@ void thread_reader(Graph*g, const int*filedata, int num_nodes, int num_edges, in
 
     m_edge e_temp{};
     vector<m_edge> edges;
-    cursor = start * 3 + 2 + num_nodes*2;
-    while(cursor< num_nodes*2 + 2 + num_edges*3){
+    cursor = start * 3 + 3 + num_nodes*2;
+    while(cursor< num_nodes*2 + 3 + num_edges*3){
         e_temp.node1 = filedata[cursor];
         e_temp.node2 = filedata[cursor+1];
         e_temp.weight = filedata[cursor+2];
@@ -88,7 +91,8 @@ void thread_reader(Graph*g, const int*filedata, int num_nodes, int num_edges, in
     bar.arrive_and_wait();
 
     mtx_e.lock();
-    for (auto &e : edges)
+    for (auto &e : edges) {
         g->add_edge(e.node1, e.node2, e.weight);
+    }
     mtx_e.unlock();
 }
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 1c02819..8fa8cc3 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3,7 +3,6 @@
 #include "partitioning.h"
 #include "timing/timing.h"
 
-#define PARALLEL_BUILD
 
 using namespace std;
 int main(int argc, char **argv){
@@ -13,6 +12,7 @@ int main(int argc, char **argv){
     }
 
     auto g = loadFromFile(argv[1]);
+
     int requestedPartitions = 100;
     timing total_time;
     
diff --git a/src/partitioning.h b/src/partitioning.h
index c8ec5d5..3d52e11 100644
--- a/src/partitioning.h
+++ b/src/partitioning.h
@@ -3,7 +3,7 @@
 
 #include "Graph.h"
 
-Graph* loadFromFile(string path);
+Graph* loadFromFile(const string& path);
 Graph* coarseGraph_s(Graph* graph);
 Graph* coarseGraph_p(Graph* graph, int num_threads);
 vector<shared_ptr<Edge>> sortEdge(const vector<shared_ptr<Edge>>& edges);
diff --git a/src/tools/ascii_bin_converter.cpp b/src/tools/ascii_bin_converter.cpp
index 0be507a..72ee292 100644
--- a/src/tools/ascii_bin_converter.cpp
+++ b/src/tools/ascii_bin_converter.cpp
@@ -31,15 +31,15 @@ int main(int argc, char *argv[]){
     skip_lines(input, 4);
 
     string useless_chars;
-    int num_nodes;
-    int num_edges;
+    unsigned int num_nodes;
+    unsigned long num_edges;
     char end_line;
     input >> useless_chars >> useless_chars
     >> num_nodes >> num_edges >> end_line;
 
     num_edges /= 2;
-    output.write((char*)&num_nodes, sizeof(int));
-    output.write((char*)&num_edges, sizeof(int));
+    output.write((char*)&num_nodes, sizeof(unsigned int));
+    output.write((char*)&num_edges, sizeof(unsigned long));
     cout << num_nodes << " " << num_edges << endl;
     skip_lines(input, 2);
 
@@ -48,9 +48,9 @@ int main(int argc, char *argv[]){
     int distance;
     cout << "Writing nodes..." << endl;
     for(int i = 0; i<num_nodes; i++){
-        output.write((char*)&i, sizeof(int));
+        output.write((char*)&i, sizeof(unsigned int));
         int random = distribution(gen);
-        output.write((char*)&random, sizeof(int));
+        output.write((char*)&random, sizeof(unsigned int));
     }
 
     cout << "Writing edges..." << endl;
@@ -59,9 +59,9 @@ int main(int argc, char *argv[]){
         >> source >> dest >> distance >> end_line;
         source--;
         dest--;
-        output.write((char *) &source, sizeof(int));
-        output.write((char *) &dest, sizeof(int));
-        output.write((char *) &distance, sizeof(int));
+        output.write((char *) &source, sizeof(unsigned int));
+        output.write((char *) &dest, sizeof(unsigned int));
+        output.write((char *) &distance, sizeof(unsigned int));
         skip_lines(input, 1);
     }
 
diff --git a/src/tools/read_bin.cpp b/src/tools/read_bin.cpp
index af04a6f..a740e5d 100644
--- a/src/tools/read_bin.cpp
+++ b/src/tools/read_bin.cpp
@@ -20,19 +20,22 @@ int main(int argc, char**argv){
         return 1;
     }
 
-    int num_nodes;
-    int num_edges;
-    input.read((char*)&num_nodes, sizeof(int));
-    input.read((char*)&num_edges, sizeof(int));
+    unsigned int num_nodes;
+    unsigned long num_edges;
+    input.read((char*)&num_nodes, sizeof(unsigned int));
+    input.read((char*)&num_edges, sizeof(unsigned long));
     cout << "num_nodes " << num_nodes << endl;
     cout << "num_edges " << num_edges << endl;
     output << num_nodes << " " << num_edges << endl;
 
-    int node;
-    int node_weight;
+    return 0;
+
+
+    unsigned int node;
+    unsigned int node_weight;
     for (int i = 0;  i<num_nodes ; i++) {
-        input.read((char*)&node, sizeof(int));
-        input.read((char*)&node_weight, sizeof(int));
+        input.read((char*)&node, sizeof(unsigned int));
+        input.read((char*)&node_weight, sizeof(unsigned int));
 
         cout << node << " " << node_weight << endl;
         //output << node << " " << node_weight << endl;
@@ -42,17 +45,16 @@ int main(int argc, char**argv){
             return 1;
         }
 
-
-
     }
 
-    int source;
-    int dest;
-    int distance;
+
+    unsigned int source;
+    unsigned int dest;
+    unsigned int distance;
     for(int i = 0; i<num_edges; i++){
-        input.read((char*)&source, sizeof(int));
-        input.read((char*)&dest, sizeof(int));
-        input.read((char*)&distance, sizeof(int));
+        input.read((char*)&source, sizeof(unsigned int));
+        input.read((char*)&dest, sizeof(unsigned int));
+        input.read((char*)&distance, sizeof(unsigned int));
 
         if(source > num_nodes-1) {
             cout << "Error: source " << source << " is greater than num_nodes " << num_nodes << endl;