Regressed in DMOJ/judge-server#673, since now the cache is per-worker-process, and gets destroyed on exit. Will require a rewrite of the caching system.

Title -

what will change -

Type of Issue -

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• Adding New Code
• Improving Code
• Improving Documentation
• Bug Fix

Programming Language

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• Python
• C++

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See https://docs.djangoproject.com/en/1.11/topics/http/sessions/#enabling-sessions

The complement function poorly handles larger graphs, making the nodes fly in all directions, causing arithmetic errors.

Steps to reproduce

1. create a large cycle
2. press the Complement button

Possible solutions

The fix should pretty much just involve trying out various functions that repulse/attract the nodes, since the current ones don't seem to handle long distances too well (see