if remainder 1 or 2. In case of remainder 2 , we divide elements from 3 to n in groups of size 4 and put 1 in one group and 2 in group . This also makes difference 1.
if ( $ n % 4 == 1 $ n % 4 == 2 ) { echo " First ▁ subset ▁ sum ▁ = ▁ " , floor ( $ s / 2 ) ; echo " Second subset sum = " , floor ( $ s / 2 + 1 ) ; echo " Difference = " }