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  1. def fn4() -> None:
  2.  
  3.     def solve( n ) -> None:
  4.  
  5.         k = 2 ** n
  6.  
  7.         for i in range(1, k):
  8.  
  9.             for j in range(0, n):
  10.  
  11.                 if (1<<j)&i:                    
  12.  
  13.                     print(j+1, end = " ")
  14.  
  15.             print()
  16.  
  17.     n = 3
  18.  
  19.     solve( n )
  20.  
  21. fn4()
  22.  
Success #stdin #stdout 0.03s 9700KB
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1 
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1 2 
3 
1 3 
2 3 
1 2 3
https://ideone.com/Gi3YFD
Subsets of a set using Bitwise
language:
Python 3 (python  3.9.5)
created:
1 year ago
visibility:
secret

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