feat: Add C++ code for the graph bfs and dfs (#401)

* Add C++ code for the graph bfs and dfs

* Add C++ code for the graph bfs and dfs

codes/cpp/include/Vertex.hpp

@@ -0,0 +1,34 @@
+/**
+ * File: PrintUtil.hpp
+ * Created Time: 2023-03-02
+ * Author: Krahets (krahets@163.com)
+ */
+
+#pragma once
+
+#include <vector>
+using namespace std;
+
+/* 顶点类 */
+struct Vertex {
+    int val;
+    Vertex(int x) : val(x) {}
+};
+
+/* 输入值列表 vals ，返回顶点列表 vets */
+vector<Vertex*> valsToVets(vector<int> vals) {
+    vector<Vertex*> vets;
+    for (int val : vals) {
+        vets.push_back(new Vertex(val));
+    }
+    return vets;
+}
+
+/* 输入顶点列表 vets ，返回值列表 vals */
+vector<int> vetsToVals(vector<Vertex*> vets) {
+    vector<int> vals;
+    for (Vertex *vet : vets) {
+        vals.push_back(vet->val);
+    }
+    return vals;
+}