[Rishavbhattarai]

Two crashes on small inputs:

• FlashSort sizes its class table as (int) (classificationRatio * n). With the default ratio 0.45 that is 0 for any 2-element array, so sort({2, 1}) throws ArrayIndexOutOfBoundsException. Any ratio and length with a product below 1 does the same, for example ratio 0.1 with 5 elements. The fix uses at least one class.
• DutchNationalFlagSort.sort(T[]) reads array[ceil(n / 2) - 1] to pick the middle value, which is index -1 for an empty array. It now returns the empty array right away.

A regression test for each. Both fail on master.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.22%. Comparing base (6f19dd4) to head (e2862ee).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7662      +/-   ##
============================================
- Coverage     82.23%   82.22%   -0.01%     
+ Complexity     8400     8399       -1     
============================================
  Files           843      843              
  Lines         26138    26140       +2     
  Branches       5098     5098              
============================================
  Hits          21494    21494              
  Misses         3853     3853              
- Partials        791      793       +2     

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[alxkm]

Looks good. Thank you for the contribution.