Thanks to everyone who competed and congratulations to kg3209, screenl and lcyxds for winning the onsite and congratulations to serichaoo and ikaurov for winning the open!

You can find the original problems here.

Idea: nickbelov Preparation: jdurie

Idea: jdurie Preparation: jdurie Idea: ScalarField Preparation: jdurie Idea: nickbelov Preparation: jim Idea: ScalarField Preparation: nickbelov Idea: nickbelov Preparation: jim Idea: ScalarField Preparation: jdurie Idea: jdurie Preparation: jdurie Idea: jdurie Preparation: jdurie Idea: jim Preparation: jim Idea: nickbelov Preparation: nickbelov Idea: jdurie Preparation: jdurie Idea: bobbilyking Preparation: bobbilyking Idea: nickbelov Preparation: nickbelov