def subset_sum(numbers, target, partial=[]): s = sum(partial) # check if the partial sum is equals to target if s == target: print "sum(%s)=%s" % (partial, target) if s >= target: return # if we reach the number why bother to continue for i in range(len(numbers)): n = numbers[i] remaining = numbers[i+1:] subset_sum(remaining, target, partial + [n]) if __name__ == "__main__": subset_sum([3,9,8,4,5,7,10],15)
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