robin

Solve all the problems in CUP Challenge

Awarded to robin on 31 Mar 2014

Obtain 50 solvers for a problem you have created

Awarded to robin on 25 Jun 2016

Like a problem or solution

Awarded to robin on 26 Mar 2014

Solve a problem for the first time

Awarded to robin on 03 Mar 2014

Create a problem

Awarded to robin on 14 Mar 2014