begin{align}
&operatorname{maximize}&-sum_{i=1}sum_{j=1} W_{ij}^2
&operatorname{s.t}&sum_{i}^nsum_{j}^nsum_{j’}^n(W_{ij}-W_{ij’})^2leq c
& & 0leq W_{ij} leq 1 quad forall j
& & W_{ii} = 0
end{align}

The above are the optimization problem.

Please help me to find optimal solution by using KKT condition