Answer Posted / gordon roberts

Here is a trivial Java function to do this. At least two
of the above answers do not work at all...??? The binary
solution seems to have some merit but why make it so
difficult and problem frought??? I put in an element
counter to verify the correct number of elements in the set
upon print out. Call the function below using the obvious
form:

printSubsets("", "abc");

static int m_cElements = 1;
private static void printSubsets(String prefix, String str)
{
if(str.equals(""))
System.out.println((m_cElements++)+": {"+prefix+"}");
else
{
printSubsets(prefix, str.substring(1));
printSubsets(prefix+str.substring(0,1), str.substring
(1));
}
}

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