# for i in $(seq 1 20); do time ./binary_search_18.o; done
        0.44 real         0.12 user         0.28 sys
        0.44 real         0.10 user         0.29 sys
        0.44 real         0.12 user         0.28 sys
        0.44 real         0.12 user         0.28 sys
        0.44 real         0.13 user         0.27 sys
        0.44 real         0.13 user         0.27 sys
        0.44 real         0.12 user         0.27 sys
        0.44 real         0.11 user         0.28 sys
        0.44 real         0.13 user         0.27 sys
        0.44 real         0.15 user         0.24 sys
        0.45 real         0.12 user         0.28 sys
        0.44 real         0.09 user         0.31 sys
        0.44 real         0.14 user         0.26 sys
        0.44 real         0.10 user         0.29 sys
        0.44 real         0.14 user         0.26 sys
        0.44 real         0.14 user         0.26 sys
        0.44 real         0.11 user         0.28 sys
        0.44 real         0.10 user         0.30 sys
        0.44 real         0.11 user         0.28 sys
        0.44 real         0.15 user         0.25 sys