Improve runtime by storing pseudo-random input graphs.

[a-t-0]

• [ ] The code to generate satisfactory pseudo random input graphs is (np)/slow. Store the input graphs for the relevant seeds and graph sizes.
• [ ] First check if the input graphs already exist.
• [ ] If yes, load from file.
• [ ] If no, search it and store it to file.

[a-t-0]

Done.