Method print

java/30_graph/Graph.java:64–69

(int[] prev, int s, int t)

    }

    private void print(int[] prev, int s, int t) { // 递归打印 s->t 的路径
        if (prev[t] != -1 && t != s) {
            print(prev, s, prev[t]);
        }
        System.out.print(t + " ");
    }

    public static void main(String[] args) {
        Graph graph = new Graph(8);