# for i in $(seq 1 5); do time ./int_sort_20.o; done
       91.58 real        89.91 user         0.76 sys
       91.70 real        90.05 user         0.75 sys
       91.66 real        90.02 user         0.72 sys
       91.73 real        90.01 user         0.80 sys
       91.65 real        89.93 user         0.82 sys