高分悬赏：Java语言怎么输出m个数字里选出n个数字的全部的排列组合，一行输出1个

Question

高分悬赏：Java语言怎么输出m个数字里选出n个数字的全部的排列组合，一行输出1个

Answer 1

有一种专门的排列组合算法可以了解一下。https://www.iteye.com/blog/liyuandong-737756

Answer 2

    public static Stack<Integer> stack = new Stack<Integer>();
    public static void main(String[] args) {
        int[] m = {1, 2, 3, 4, 5, 6};
        int n = 3;
        f(m, n, 0, 0);
    }
    private static void f(int[] shu, int targ, int has, int cur) {
        if (has == targ) {
            System.out.println(stack);
            return;
        }
        for (int i = cur; i < shu.length; i++) {
            if (!stack.contains(shu[i])) {
                stack.add(shu[i]);
                f(shu, targ, has + 1, i);
                stack.pop();
            }
        }
    }