dfaure added a comment.
I cannot confirm that stable_sort is faster, on the contrary.
http://www.davidfaure.fr/2018/qsort_performance.cpp updated, says (repeatedly)
"std::sort took: 5003 ms"
"std::stable_sort took: 7490 ms"
Maybe on specific data (the actual filenames you're testing this with),
stable_sort ends up being faster, but this isn't true in general (with random
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