Algorithm 3 ChooseSolutions

Require:  O (initial population), N (population size) Ensure:  $O^{\prime }$ (parent population) 1:O = ⌀ 2:$\mathbf{While}$ $|O^{\prime }|$ < N $\mathbf{do}$ 3:   Randomly select two solutions $p_1$ and $p_2$ from population O 4:   $\mathbf{If}$ $I_c$($p_1$) <$I_c$($p_2$) & $I_d$($p_1,o$) >$I_d$($p_2,o$)$(o\in O,o\ne p1,p2)$ 5:      $O^{\prime }=O^{\prime }\cup p_1$ 6:   $\mathbf{Else}\mathbf{If}$$I_c$($p_1$)>$I_c$($p_2$) & $I_d$($p_1,o$) <$I_d$($p_2,o$)$(o\in O,o\ne p1,p2)$ 7:      $O^{\prime }=O^{\prime }\cup p_2$ 8:   $\mathbf{Else}$ 9:   Select one randomly 10:   $\mathbf{End}$ 11:$\mathbf{End}\mathbf{While}$ 12:return $O^{\prime }$;