diff --git a/homework5/MatrixGraph.h b/homework5/MatrixGraph.h
index 2840b0c..f0fcd6e 100644
--- a/homework5/MatrixGraph.h
+++ b/homework5/MatrixGraph.h
@@ -5,6 +5,7 @@
 #ifndef MATRIXGRAPH_H
 #define MATRIXGRAPH_H
 
+#include <functional>
 #include <sstream>
 #include<vector>
 
@@ -48,7 +49,7 @@ public:
 
     // 连接顶点
     void connect(int id1, int id2, T weight = 0) {
-        if (id1 > data.size() || id2 > data.size() || (id1 < 0 || id2 < 0)) {
+        if (id1 >= data.size() || id2 >= data.size() || (id1 < 0 || id2 < 0)) {
             throw NodeIdOutOfRangeException("您提供的id不合理", 0X001);
         }
         if (id1 == id2) {
@@ -97,5 +98,28 @@ public:
         }
         return ss.str();
     }
+
+    vector<T> DFS(int startID) {
+        if (startID >= matrix.size() || startID < 0) {
+            throw NodeIdOutOfRangeException("您提供的id不合理", 0X004);
+        }
+        vector<bool> visited(matrix.size(), false); //访问标记
+        vector<T> result;
+
+        function<void(int)> dfsHelper = [&](int node) {
+            visited[node] = true;
+            result.push_back(data.at(node));
+
+            for (int i = 0; i < matrix[node].size(); ++i) {
+                if (matrix[node][i].connected && !visited[i]) {
+                    dfsHelper(i);
+                }
+            }
+        };
+
+        dfsHelper(startID);
+
+        return result;
+    }
 };
 #endif //MATRIXGRAPH_H
diff --git a/homework5/test1.cpp b/homework5/test1.cpp
index e8f9361..4f6f801 100644
--- a/homework5/test1.cpp
+++ b/homework5/test1.cpp
@@ -26,7 +26,7 @@
 using namespace std;
 
 int main() {
-    MatrixGraph<int> graph = new MatrixGraph<int>();
+    MatrixGraph<int> graph = MatrixGraph<int>();
     int n, e;
     cin >> n >> e;
     for (int i = 0; i < n; i++) {
@@ -39,5 +39,12 @@ int main() {
     }
     cout << "图的邻接矩阵为：" << endl;
     cout << graph.to_string() << endl;
+    vector<int> dfs = graph.DFS(0);
+    cout << "图的DFS序列为：" << endl;
+    vector<int>::iterator it;
+    for (it = dfs.begin(); it != dfs.end(); it++) {
+        cout << *it << " ";
+    }
+    cout << endl;
     return 0;
 }
diff --git a/homework5/test2.cpp b/homework5/test2.cpp
index 4f34338..b678b8c 100644
--- a/homework5/test2.cpp
+++ b/homework5/test2.cpp
@@ -27,25 +27,25 @@
 using namespace std;
 
 int main() {
-    ListGraph<int> graph=ListGraph<int>();
-    int n,e;
-    cin>>n>>e;
-    for(int i=0;i<n;i++) {
+    ListGraph<int> graph = ListGraph<int>();
+    int n, e;
+    cin >> n >> e;
+    for (int i = 0; i < n; i++) {
         graph.insert(i);
     }
-    int id1,id2;
-    for(int i=0;i<e;i++) {
-        cin>>id1>>id2;
-        graph.connect(id1,id2);
+    int id1, id2;
+    for (int i = 0; i < e; i++) {
+        cin >> id1 >> id2;
+        graph.connect(id1, id2);
     }
-    cout<<"邻接表："<<endl;
-    cout<<graph.to_string()<<endl;
-    cout<<"BFS序列："<<endl;
-    vector<int> bfs=graph.BFS(0);
+    cout << "邻接表：" << endl;
+    cout << graph.to_string() << endl;
+    cout << "BFS序列：" << endl;
+    vector<int> bfs = graph.BFS(0);
     vector<int>::iterator it;
-    for(it=bfs.begin();it!=bfs.end();++it) {
-        cout<<*it<<" ";
+    for (it = bfs.begin(); it != bfs.end(); ++it) {
+        cout << *it << " ";
     }
-    cout<<endl;
+    cout << endl;
     return 0;
 }