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Using BufferReader for input and Trove-library for faster Collections. Also, the HashSets initial capacity is set to a suitable size and the strings are converted to a long representation.
Measures:
| File | Time |
|---|---|
| Rgn00.txt | ~ 190ms |
| Rgn01.txt | ~ 1500ms |
| Rgn02.txt | ~ 1580ms |
Using BufferReader for input and simple unconfigured HashSet storage and duplicate check.
Measures:
| File | Time |
|---|---|
| Rgn00.txt | ~ 230ms |
| Rgn01.txt | ~ 6000ms |
| Rgn02.txt | ~ 6000ms |