I cannot see other people's code in the open hack stage of div3, and it shows N/A. How can I solve this problem? Is it a blind hack? In addition, I successfully became a green name after two div2 games, but now I still cannot see other people's solutions. How can I solve this problem? Or what specific requirements must be met to be allowed to see the code? Do I need to participate in a certain number of games or reach a certain rating?