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clang++ -o llil4vec -std=c++11 -Wall -O3 llil4vec.cpp
clang++ -o llil4vec -std=c++20 -Wall -O3 llil4vec.cpp  # faster
...
# enable parallel via -fopenmp
clang++ -o llil4vec-omp -std=c++11 -fopenmp -Wall -O3 llil4vec.cpp
clang++ -o llil4vec-omp -std=c++20 -fopenmp -Wall -O3 llil4vec.cpp  # 
+faster

$ time ./llil4vec big1.txt big2.txt big3.txt >out.txt

...

std:c++11:  2.308 secs
std:c++20:  2.267 secs

#if defined(_OPENMP)
#include <omp.h>
...
   );
#endif
}