Add graph references

references/programiz/adj_mat.c

@@ -0,0 +1,48 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+// Adjacency Matrix representation in C
+
+#include <stdio.h>
+#define V 4
+
+// Initialize the matrix to zero
+void init(int arr[][V]) {
+  int i, j;
+  for (i = 0; i < V; i++)
+    for (j = 0; j < V; j++)
+      arr[i][j] = 0;
+}
+
+// Add edges
+void addEdge(int arr[][V], int i, int j) {
+  arr[i][j] = 1;
+  arr[j][i] = 1;
+}
+
+// Print the matrix
+void printAdjMatrix(int arr[][V]) {
+  int i, j;
+
+  for (i = 0; i < V; i++) {
+    printf("%d: ", i);
+    for (j = 0; j < V; j++) {
+      printf("%d ", arr[i][j]);
+    }
+    printf("\n");
+  }
+}
+
+int main() {
+  int adjMatrix[V][V];
+
+  init(adjMatrix);
+  addEdge(adjMatrix, 0, 1);
+  addEdge(adjMatrix, 0, 2);
+  addEdge(adjMatrix, 1, 2);
+  addEdge(adjMatrix, 2, 0);
+  addEdge(adjMatrix, 2, 3);
+
+  printAdjMatrix(adjMatrix);
+
+  return 0;
+}