begin{tabular}{ |l|l|c c c|l|l|l| }
    hline
    Problem $I_k$ & Solved $C_k$ & multicolumn{3}{ |c| }{Solution to $C_k$} & Current & Pursue & Stored\
    & & $x_1$ & $x_2$ & $z$ & & & \ hline
end{tabular}