diff --git a/graph/connected_components.cpp b/graph/connected_components.cpp
index c3acad635..a23a54b42 100644
--- a/graph/connected_components.cpp
+++ b/graph/connected_components.cpp
@@ -5,13 +5,13 @@ using std::vector;
 
 class graph {
   private:
-   vector<vector<int>> adj;
-   int connected_components;
-   void depth_first_search();
-   void explore(int, vector<bool>&);
+    vector<vector<int>> adj;
+    int connected_components;
+    void depth_first_search();
+    void explore(int, vector<bool>&);
   public:
-   graph(int n): adj(n, vector<int>()) {
-    connected_components = 0;
+    graph(int n): adj(n, vector<int>()) {
+      connected_components = 0;
    }
    void addEdge(int, int);
    int getConnectedComponents() {
@@ -48,8 +48,8 @@ void graph::explore(int u, vector<bool> &visited) {
 
 int main() {
   graph g(4);
-  g.addEdge(1,2);
-  g.addEdge(3,2);
+  g.addEdge(1, 2);
+  g.addEdge(3, 2);
   std::cout << g.getConnectedComponents();
   return 0;
 }