text: calculation to check if the number can be made by summation of divisors
code: if ( j < v . get ( i - 1 ) ) subset [ i ] [ j ] = subset [ i - 1 ] [ j ] ; else { subset [ i ] [ j ] = subset [ i - 1 ] [ j ] || subset [ i - 1 ] [ j - v . get ( i - 1 ) ] ; } } }