qijiuliushisan的博客

代码 public List<Integer> grayCode(int n) { List<Integer> gray = new ArrayList<Integer>(); gray.add(0); //初始化 n = 0 的解 for (int i = 0; i < n; i++) { int add ...

思路 代码 public String getPermutation(int n, int k) { int[] fac= {0,1,2,6,24,120,720,5040,40320,362880,3628800}; String res=""; String s="123456789".substring(0,n); --k; while(k>0) { int...