text: If we choose element from section 1 , we cannot have selection from same section in adjacent rows
code: dp [ i + 1 , 0 ] = Math . Max ( dp [ i , 1 ] , dp [ i , 2 ] ) + m1 ; dp [ i + 1 , 1 ] = Math . Max ( dp [ i , 0 ] , dp [ i , 2 ] ) + m2 ; dp [ i + 1 , 2 ] = Math . Max ( dp [ i , 1 ] , dp [ i , 0 ] ) + m3 ; }