# for i in $(seq 1 20); do time ./binary_search_18.o; done
        0.60 real         0.22 user         0.33 sys
        0.60 real         0.19 user         0.36 sys
        0.59 real         0.22 user         0.33 sys
        0.60 real         0.19 user         0.36 sys
        0.60 real         0.26 user         0.29 sys
        0.59 real         0.21 user         0.35 sys
        0.60 real         0.21 user         0.34 sys
        0.60 real         0.21 user         0.34 sys
        0.59 real         0.20 user         0.35 sys
        0.60 real         0.26 user         0.29 sys
        0.60 real         0.19 user         0.36 sys
        0.60 real         0.23 user         0.32 sys
        0.60 real         0.21 user         0.34 sys
        0.60 real         0.19 user         0.36 sys
        0.59 real         0.22 user         0.33 sys
        0.60 real         0.19 user         0.36 sys
        0.60 real         0.23 user         0.32 sys
        0.59 real         0.17 user         0.38 sys
        0.60 real         0.22 user         0.33 sys
        0.60 real         0.17 user         0.38 sys