Hashing questionID to produce a color for a question generates color collisions for the eye

[kounkou]

Description

So I have a hard problem... Or I think I do... 🥲
I am trying to generate colors for each questions for the Stats graph.
It turns out, the solution I wanted to go with is to hash the questionID, like : BFS, or DFS etc... and then generate a color based on it.
But I am getting collisions (as expected)

Acceptance criteria

• The colors should be disctincts for the human eye
• The color should be automatically generated (I don't want to select the color manually as the number of questions could grow...)

Example of collisions

notice how Merge Int., bfs it., 'Factorial`, ... have collisions when I hash the questionId to a 16 bits integer.

Here are collisions on a 32 bit integer hashed number binary search and Insert int. ...

Debuging infos

To confirm those are color collisions I checked what's the hue produced for 2 questionIds resulting in similar colors. Those really are collisions for the human eye. Notice the 4 points gap between bother hues

Here is the eye collision seen for Topological sort and Meeting rooms

qml: ---> questionId:  Topological sort
hash:  254168623
hue:  343

qml: ---> questionId:  Meeting rooms
hash:  780882099
hue:  339

[kounkou]

This post is really interesting!

https://stackoverflow.com/questions/1168260/algorithm-for-generating-unique-colors