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class Graph {

    private final int V;
    private final int[][] adj;

    public Graph(int V) {
        this.V = V;
        adj = new int[V][V];
    }

    private boolean isCyclicUtil(int i, boolean[] visited, boolean[] recStack) {
        if (recStack[i])
            return true;
        if (visited[i])
            return false;
        visited[i] = true;
        recStack[i] = true;
        for (int c = 0; c < V; c++) {
            if (adj[i][c] == 1) {
                if (isCyclicUtil(c, visited, recStack))
                    return true;
            }
        }
        recStack[i] = false;
        return false;
    }

    private void addEdge(int source, int dest) {
        adj[source][dest] = 1;
    }

    private boolean isCyclic() {
        boolean[] visited = new boolean[V];
        boolean[] recStack = new boolean[V];
        for (int i = 0; i < V; i++) {
            if (isCyclicUtil(i, visited, recStack))
                return true;
        }
        return false;
    }

    public static void main(String[] args) {
        Graph graph = new Graph(4);
        graph.addEdge(0, 1);
        graph.addEdge(0, 2);
        graph.addEdge(1, 2);
        graph.addEdge(2, 0);
        graph.addEdge(2, 3);
        graph.addEdge(3, 3);

        if (graph.isCyclic())
            System.out.println("Graph contains cycle");
        else
            System.out.println("Graph doesn't contain cycle");
    }
}