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Time comparation of the presented solutions (not an answer)

The efficiency of the answers is not important. Nevertheless,following @josephwb approach, I tried to time all the answers presented.

Time comparison of the presented solutions (not an answer)

The efficiency of the answers is not important. Nevertheless, following @josephwb approach, I tried to time all the answers presented.

Time comparation (not an answer)

I use as input the Portuguese translation of Victor Hugo "Les Miserables" (great book!) and count the occurrences of "a".

$ wc miseraveis.txt 
29331  304166 1852674 miseraveis.txt (my edition has 5 volumes, many pages)

Time comparation of the presented solutions (not an answer)

I use as input the Portuguese translation of Victor Hugo "Les Miserables" (great book!) and count the occurrences of "a". My edition has 5 volumes, many pages...

$ wc miseraveis.txt 
29331  304166 1852674 miseraveis.txt 

I run each answer 3 times and choose the best.

Each answer was run 3 times and choose the best.