Obtain 50 solvers for a problem you have created

Awarded to Erik Luiten on 22 Mar 2019

Comment on a problem or solution

Awarded to Erik Luiten on 07 Sep 2017

Solve 500 problems

Awarded to Erik Luiten on 16 May 2017

Be the first to solve a problem

Awarded to Erik Luiten on 06 Feb 2017

Create a problem

Awarded to Erik Luiten on 06 Feb 2017

Solve a problem with a best solution

Awarded to Erik Luiten on 04 Jan 2017

Solve all the problems in CUP Challenge

Awarded to Erik Luiten on 21 Dec 2016

Like a problem or solution

Awarded to Erik Luiten on 03 Nov 2016

Solve a problem for the first time

Awarded to Erik Luiten on 03 Nov 2016