Pseudocode 2:

Initialize the grey wolf population $P_j(j=1,2,3,\dots ,n)$   Initialize $x,X$ and $Y$   Calculate fitness of every search agent   $P_x=$ the best search agent   $P_{\beta }=$ the second-best search agent   $P_{\delta }=$ the third-best search agent   $\mathrm{While}(t<$ maximum number of iterations)     For each search agent     Update the position of the current search agent     End for     Update $x,X$ and $Y$     Calculate the fitness of all search agents     Update $P_x,$$P_{\beta },$$P_{\delta }$     $t=t+1$   End while   Return$P_x$