鼠鼠太菜了,求大佬指点一下第一题:用的全排列,加判断会不会有相邻元素之和都不是素数才统计到最终结果种,但是只通过了44%public static int func(int n){int[] used = new int[n+1];huisu(n,used);return result.size();}public static void huisu(int n,int[] used){if(list.size() == n){result.add(new ArrayList<>(list));return;}for(int i = 1;i <= n;i++){if(used[i] == 1){continue;}if(!list.isEmpty() &amp;&amp; !isValid(list.get(list.size()-1),i)){continue;}used[i] = 1;list.add(i);huisu(n,used);list.remove(list.size()-1);used[i] = 0;}}public static boolean isValid(int m,int n){if(m+n == 6 || m+n == 4 || m+n == 8 || m+n == 9){return true;}return false;}}