li jian

Obtain 50 solvers for a problem you have created

Awarded to li jian on 17 Apr 2013

Comment on a problem or solution

Awarded to li jian on 12 Dec 2012

Solve a problem for the first time

Awarded to li jian on 23 Oct 2012

Create a problem

Awarded to li jian on 12 Dec 2012

Solve a problem with a best solution

Awarded to li jian on 27 Nov 2024

Publish your first review

Awarded to li jian on 09 Oct 2019