http://poj.org/problem?id=3187 //* @author: 82638882@163.com import java.io.*; import java.util.Arrays; public class Main { static int[] p,arr; static int a; public static void main(String[] args) throws IOException { InputStreamReader is=new InputStreamReader(System.in); BufferedReader in=new BufferedReader(is); String[] ss=in.readLine().split(" "); a=Integer.parseInt(ss[0]); int sum=Integer.parseInt(ss[1]); p=new int[a]; arr=new int[a]; for(int i=0;i< a;i++) p[i]=i+1; for(int u=0;;u++) { if(sum==get(arr)) { for(int i=0;i< a;i++) System.out.print(p[i]+" "); break; } next(); } } static void next() { for(int i=a-1;i>=0;i--) { for(int j=a-1;j>i;j--) { if(p[j]>p[i]) { int temp=p[j]; p[j]=p[i]; p[i]=temp; Arrays.sort(p,i+1,a); return; } } } } static int get(int[] arr) { int b=a; for(int i=0;i< b;i++) arr[i]=p[i]; while((b--)!=0) { for(int i=0;i< b;i++) arr[i]=arr[i]+arr[i+1]; } return arr[0]; } }
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