arknave's blog

By arknave, history, 13 months ago, In English

Run the following code in the custom invocation tab with pypy3.6

import random

print('Hello world!')

This gives the following verdict:

Runtime error: exit code is 13131313
Used: 373 ms, 10900 KB

Any ideas why? This also happens with pypy2.7, but not when using the CPython interpreters.

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By arknave, history, 14 months ago, In English

The 2019 North American Qualifier (NAQ) will be held tomorrow. The NAQ is an online, pre-regional programming contest to help coaches choose teams for regional competitions (or serve as practice). The contest begins at 2019-10-05 18:00 UTC. Official participants who have already registered can access the problems at

There is also a slightly delayed open mirror where anyone can compete. The open mirror begins fifteen minutes after the official contest, and is available here:

More details here: Past versions: 2018, 2017.

Good luck to all competing!

EDIT: Contest is over, congratulations to all the teams that competed! Some statistics and solution outlines available here:

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By arknave, history, 2 years ago, In English

The 2018 South Central USA (SCUSA) ACM-ICPC Regional Contest is tomorrow, Saturday November 10rd, 6pm UTC. There is an open division for anyone interested in competing at: The official scoreboard will be at Good luck to all competitors!

There is no way to request or issue clarifications in the open division of Kattis, please comment here if any questions arise.

The problem set was created by myself, Greg Hamerly, Etienne Vouga, and Rob Hochberg. Thanks to xiaowuc1 for inspiration.

Also thanks to brycesandlund because I copied his NCNA announcement.

EDIT: Contest delayed by 15 minutes. Will start in 10 minutes. Good luck!

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