Add graph references

references/programiz/adj_list.cpp

@@ -0,0 +1,39 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+// Adjascency List representation in C++
+
+#include <vector>
+#include <iostream>
+
+using namespace std;
+
+// Add edge
+void addEdge(vector<int> adj[], int s, int d) {
+  adj[s].push_back(d);
+  adj[d].push_back(s);
+}
+
+// Print the graph
+void printGraph(vector<int> adj[], int V) {
+  for (int d = 0; d < V; ++d) {
+    cout << "\n Vertex "
+       << d << ":";
+    for (auto x : adj[d])
+      cout << "-> " << x;
+    printf("\n");
+  }
+}
+
+int main() {
+  int V = 5;
+
+  // Create a graph
+  vector<int> adj[V];
+
+  // Add edges
+  addEdge(adj, 0, 1);
+  addEdge(adj, 0, 2);
+  addEdge(adj, 0, 3);
+  addEdge(adj, 1, 2);
+  printGraph(adj, V);
+}