private void readInput() throws Exception {
System.out.println("Reading input...");
scanner = new Scanner(file);
vertexCount = scanner.nextInt();
edgeCount = scanner.nextInt();
initializeMatrix(vertexCount);
while (scanner.hasNext()) {
String city1 = scanner.next().toUpperCase();
String city2 = scanner.next().toUpperCase();
int distance = scanner.nextInt();
updateCityNodeMap(city1, city2);
addEdge(city2NodeMap.get(city1), city2NodeMap.get(city2), distance);
}
System.out.println("Adjacency Matrix initialized.");
}
