diff --git a/procedures/algo_cpp/khop_core.cpp b/procedures/algo_cpp/khop_core.cpp
index b44f7f21ca..2b52d6b4b9 100644
--- a/procedures/algo_cpp/khop_core.cpp
+++ b/procedures/algo_cpp/khop_core.cpp
@@ -1,4 +1,6 @@
 /**
+ * Copyright 2024 Yingqi Zhao
+ * 
  * @Function: Compute the k-hop algorithm.
  * @param:
  *
@@ -19,42 +21,37 @@
 
 using namespace lgraph_api;
 using namespace lgraph_api::olap;
-size_t k_hop(OlapBase<Empty>& graph, size_t root_vid, ParallelVector<size_t>&result, size_t k)
-{
+
+size_t k_hop(OlapBase<Empty>& graph, size_t root_vid, ParallelVector<size_t>& result, size_t k) {
     size_t root = root_vid;
     auto active_in = graph.AllocVertexSubset();
     active_in.Add(root);
     auto active_out = graph.AllocVertexSubset();
-    auto parent=graph.AllocVertexArray<size_t>();
+    auto parent = graph.AllocVertexArray<size_t>();
     parent.Fill(0);
-    parent[root]=root;
+    parent[root] = root;
     size_t num_activations = 1;
     size_t discovered_vertices, j = 0;
-    for (size_t ii = 0; ii < k ; ii++)
-    {
+    for (size_t ii = 0; ii < k; ii++) {
         active_out.Clear();
         num_activations = graph.ProcessVertexActive<size_t>(
             [&](size_t vi) {
                 size_t num_activations = 0;
-                for (auto& edge : graph.OutEdges(vi))
-                {
+                for (auto& edge : graph.OutEdges(vi)) {
                     size_t dst = edge.neighbour;
-                    if (parent[dst] == 0)
-                    {
+                    if (parent[dst] == 0) {
                         auto lock = graph.GuardVertexLock(dst);
-                        if(parent[dst] == 0)
-                        {
+                        if (parent[dst] == 0) {
                             parent[dst] = vi;
                             num_activations += 1;
                             active_out.Add(dst);
-                            result[j++]=dst;
+                            result[j++] = dst;
                         }
                     }
                 }
                 return num_activations;
             },
-            active_in
-        );
+            active_in);
         printf("activates(%lu) <= %lu \n", ii+1, num_activations);
         discovered_vertices += num_activations;
         active_in.Swap(active_out);
diff --git a/procedures/algo_cpp/khop_standalone.cpp b/procedures/algo_cpp/khop_standalone.cpp
index 887e1ae3ca..91d370c2ec 100644
--- a/procedures/algo_cpp/khop_standalone.cpp
+++ b/procedures/algo_cpp/khop_standalone.cpp
@@ -1,3 +1,4 @@
+// Copyright 2024 Yingqi Zhao
 #include "olap/olap_on_disk.h"
 #include "tools/json.hpp"
 #include "./algo.h"
@@ -5,29 +6,23 @@ using namespace lgraph_api;
 using namespace lgraph_api::olap;
 using json = nlohmann::json;
 
-class MyConfig : public ConfigBase<Empty>
-{
+class MyConfig : public ConfigBase<Empty> {
  public:
     std::string root = "0";
     std::string name = std::string("khop");
-    size_t value_k=3;
-    void AddParameter(fma_common::Configuration& config)
-    {
+    size_t value_k = 3;
+    void AddParameter(fma_common::Configuration& config) {
         ConfigBase<Empty>::AddParameter(config);
         config.Add(root, "root", true).Comment("Identifier of the root node.");
-        config.Add(value_k, "value_k", true).Comment(
-            "Number of search layers(value of k in K-hop algorithm)."
-        );
+        config.Add(value_k, "value_k", true).Comment("Number of search layers(value of k in K-hop algorithm).");
     }
-    void Print()
-    {
+    void Print() {
         ConfigBase<Empty>::Print();
         std::cout << " name: " << name << std::endl;
         std::cout << " root: " << name << std::endl;
         std::cout << " value_k: " << value_k << std::endl;
     }
-    MyConfig(int& argc, char**& argv) : ConfigBase<Empty>(argc, argv)
-    {
+    MyConfig(int& argc, char**& argv) : ConfigBase<Empty>(argc, argv) {
         fma_common::Configuration config;
         AddParameter(config);
         config.ExitAfterHelp(true);
@@ -36,7 +31,7 @@ class MyConfig : public ConfigBase<Empty>
     }
 };
 
-extern size_t k_hop(OlapBase<Empty>& graph, size_t root_vid, ParallelVector<size_t>&result, size_t k);
+extern size_t k_hop(OlapBase<Empty>& graph, size_t root_vid, ParallelVector<size_t>& result, size_t k);
 
 int main(int argc, char** argv){
     double start_time;
@@ -78,6 +73,6 @@ int main(int argc, char** argv){
     printf("core_cost = %.2lf(s)\n", core_cost);
     printf("output_cost = %.2lf(s)\n", output_cost);
     printf("total_cost = %.2lf(s)\n", prepare_cost + core_cost + output_cost);
-    printf("DONE. \n");
+    printf("DONE.\n");
     return 0;
 }
\ No newline at end of file