[2021] add hash code event

Author: exoji2e

_events/2021-02-25-hashcode.md

@@ -0,0 +1,47 @@
+---
+layout: events
+title: Hash Code 2021
+place: "Online"
+id: hashcode
+---
+Code@LTH has organized a hub for the annual team programming competition Google Hash Code since 2016.
+
+
+## Info-summary
+
+- Date-time: 2021-02-25 18:30 UTC+1.
+- Contest time 18:30-22:30 UTC+1
+- Deadline to register: 2021-02-24.
+- Location: online
+- [Sign-Up link](https://codingcompetitions.withgoogle.com/hashcode).
+- [Hashcode-jugde](https://hashcodejudge.withgoogle.com/#/home) (Accessible when you have signed up).
+
+## General information
+
+Hash Code is a yearly team programming competition made by Google.
+
+You are given one optimization problem, which is either very hard or impossible to solve optimally. Instead you should find a solution that maximizes your score.
+
+_This year there is no on site event, but you can join our virtual hub, putting your team on our local scoreboard._
+
+To participate you will have to sign up [here](https://codingcompetitions.withgoogle.com/hashcode).
+
+Remember to mark Code@LTH as your hub when you create your team on the judge system.
+
+## Todo-list for participants
+
+- Sign up at: [https://codingcompetitions.withgoogle.com/hashcode](https://codingcompetitions.withgoogle.com/hashcode)
+- Find 3 friends (or fewer, teams of 2-4 are accepted).
+- Create your team on the judge-website that you get access to after sign up, and select Code@LTH as your hub.
+
+### Tips&Tricks
+
+Hash code problems are similar to one an other. You best bet of doing well is to make sure to practice with your team! 
+
+- Look at the practice problem on the [Hashcode-jugde](https://hashcodejudge.withgoogle.com/#/home).
+- Look at some [old problems](https://codingcompetitions.withgoogle.com/hashcode/archive).
+- Use a [template](https://github.com/exoji2e/hashcode-template).
+  - Which organizes your output files for you
+  - Scores your outputs locally
+  - Keeping track of your best output so far, and what code produced it.
+  - Make sure to use it in a practice session before on the real competition!

redirects/hashcode.md

@@ -1,6 +1,6 @@
 ---
 title: Hashcode 2020
-redirect_to: "/events/2020-02-20-hashcode"
+redirect_to: "/events/2021-02-25-hashcode"
 permalink: "/hashcode/"
 ---
 redirect_to: "https:codeatlth.org/events/2020-02-20-hashcode"