Function to add the individual digits into the vector
static void init ( string l ) { for ( int i = 0 ; i < 2001 ; i ++ ) { for ( int j = 0 ; j < 2001 ; j ++ ) { for ( int k = 0 ; k < 2 ; k ++ ) { dp [ i , j , k ] = - 1 ; } } } v . Clear ( ) ;