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  1. /*
  2.  * Description: Generate all subsets of a set in Java.
  3.  * 
  4.  * Author     : Adrian Statescu
  5.  *
  6.  * License    : MIT
  7.  */
  8.  
  9. import java.util.Scanner;
  10. import java.io.*;
  11.  
  12. public class Main {
  13.  
  14. 	    public static int pow(int a, int b) {
  15.  
  16. 	    	   int r = 1;
  17.  
  18. 	    	   for(int i = 1; i <= b; ++i) {
  19.  
  20.                    r = r * a;
  21. 	    	   }
  22.  
  23. 	    	   return r;
  24. 	    }
  25.  
  26. 	    public static void generate_all_subsets(int n) {
  27.  
  28.                int total = pow(2, n);               
  29.  
  30.                for(int i = 1; i < total; ++i) {
  31.  
  32.                	   for(int j = 0; j < n; ++j ) {                       
  33.  
  34.                        if((i & (1<<j))!=0) System.out.printf("%d ", (j+1));      
  35.  
  36.                	   } 
  37.  
  38.                	   System.out.println(""); 
  39.  
  40.                }
  41.  
  42.         }
  43.  
  44.  
  45.        public static void main(String[] args) {
  46.  
  47.                     Scanner scanner = new Scanner(System.in);
  48.  
  49.                     int n = scanner.nextInt();
  50.  
  51.                     scanner.close();
  52.  
  53.                     generate_all_subsets( n );	                    
  54.  
  55.  
  56.        }
  57. }
Success #stdin #stdout 0.17s 37252KB
comments (?)
stdin 
7
stdout 
1 
2 
1 2 
3 
1 3 
2 3 
1 2 3 
4 
1 4 
2 4 
1 2 4 
3 4 
1 3 4 
2 3 4 
1 2 3 4 
5 
1 5 
2 5 
1 2 5 
3 5 
1 3 5 
2 3 5 
1 2 3 5 
4 5 
1 4 5 
2 4 5 
1 2 4 5 
3 4 5 
1 3 4 5 
2 3 4 5 
1 2 3 4 5 
6 
1 6 
2 6 
1 2 6 
3 6 
1 3 6 
2 3 6 
1 2 3 6 
4 6 
1 4 6 
2 4 6 
1 2 4 6 
3 4 6 
1 3 4 6 
2 3 4 6 
1 2 3 4 6 
5 6 
1 5 6 
2 5 6 
1 2 5 6 
3 5 6 
1 3 5 6 
2 3 5 6 
1 2 3 5 6 
4 5 6 
1 4 5 6 
2 4 5 6 
1 2 4 5 6 
3 4 5 6 
1 3 4 5 6 
2 3 4 5 6 
1 2 3 4 5 6 
7 
1 7 
2 7 
1 2 7 
3 7 
1 3 7 
2 3 7 
1 2 3 7 
4 7 
1 4 7 
2 4 7 
1 2 4 7 
3 4 7 
1 3 4 7 
2 3 4 7 
1 2 3 4 7 
5 7 
1 5 7 
2 5 7 
1 2 5 7 
3 5 7 
1 3 5 7 
2 3 5 7 
1 2 3 5 7 
4 5 7 
1 4 5 7 
2 4 5 7 
1 2 4 5 7 
3 4 5 7 
1 3 4 5 7 
2 3 4 5 7 
1 2 3 4 5 7 
6 7 
1 6 7 
2 6 7 
1 2 6 7 
3 6 7 
1 3 6 7 
2 3 6 7 
1 2 3 6 7 
4 6 7 
1 4 6 7 
2 4 6 7 
1 2 4 6 7 
3 4 6 7 
1 3 4 6 7 
2 3 4 6 7 
1 2 3 4 6 7 
5 6 7 
1 5 6 7 
2 5 6 7 
1 2 5 6 7 
3 5 6 7 
1 3 5 6 7 
2 3 5 6 7 
1 2 3 5 6 7 
4 5 6 7 
1 4 5 6 7 
2 4 5 6 7 
1 2 4 5 6 7 
3 4 5 6 7 
1 3 4 5 6 7 
2 3 4 5 6 7 
1 2 3 4 5 6 7
https://ideone.com/SjHSWR
Generates all subsets of a set based on Bitwise Operators & and <<
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
secret

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