Refactoring coordinate indices and random choice

[kotarot]

No description provided.

[codecov]

Codecov Report

Merging #9 (ca2ce24) into main (1f1d5b8) will decrease coverage by 0.16%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
- Coverage   82.92%   82.75%   -0.17%     
==========================================
  Files           7        7              
  Lines         205      203       -2     
==========================================
- Hits          170      168       -2     
  Misses         35       35              

Flag	Coverage Δ
unittests	82.75% <100.00%> (-0.17%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
rectangle_packing_solver/sequence_pair.py	80.85% <100.00%> (ø)
rectangle_packing_solver/solver.py	98.07% <100.00%> (-0.08%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1f1d5b8...ca2ce24. Read the comment docs.