随机分配座位，共50个学生，使学号相邻的同学座位不能相邻

    public static void assignSeat(){
        int count = 50;
        int[][] seats = new int[2][count];//int[0]是50个座位，存储值为学生号，int[1]是对应50个学生，值为1则为已分配，0未分配
        Random random = new Random();
        int student = random.nextInt(count);
        seats[0][0] = student;//先分配第一个座位给student号学生
        seats[1][student] = 1;
        for(int i = 1 ; i < count ;){
            student = random.nextInt(count);
            if(seats[1][student] != 1 && 
                    (student - seats[0][i-1]) !=1 && 
                       (student - seats[0][i-1]) !=-1){
                seats[0][i++] = student;
                seats[1][student] = 1;
            } 
            System.out.println( "loop");
        }
        
        for(int stu : seats[0])
            System.out.print(stu + ",");
    }