text: If there exists no element no sum is possible
code: elif ( i == 0 ) : NEW_LINE INDENT subset [ i % 2 ] [ j ] = False NEW_LINE DEDENT elif ( arr [ i - 1 ] <= j ) : NEW_LINE INDENT subset [ i % 2 ] [ j ] = subset [ ( i + 1 ) % 2 ] [ j - arr [ i - 1 ] ] or subset [ ( i + 1 ) % 2 ] [ j ] NEW_LINE DEDENT else : NEW_LINE INDENT subset [ i % 2 ] [ j ] = subset [ ( i + 1 ) % 2 ] [ j ] NEW_LINE DEDENT return subset [ n % 2 ] [ sum ] NEW_LINE