Just count 0
to 2^n - 1
and print the numbers according to the binary representation of your count. a 1
means you print that number and a 0
means you don’t. Example:
set is {1, 2, 3, 4, 5}
count from 0 to 31:
count = 00000 => print {}
count = 00001 => print {1} (or 5, the order in which you do it really shouldn't matter)
count = 00010 => print {2}
00011 => print {1, 2}
00100 => print {3}
00101 => print {1, 3}
00110 => print {2, 3}
00111 => print {1, 2, 3}
...
11111 => print {1, 2, 3, 4, 5}