$ javac -version
javac 11.0.7
$ java -version
openjdk version "11.0.7" 2020-04-14
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.7+10)
OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.7+10, mixed mode)

java-algs4 RandomIntsPlain 5000 10000000 121 | time -p java-algs4 ThreeSum
756
real        21.98
user        21.91
sys          0.14
java-algs4 RandomIntsPlain 5000 10000000 121 | time -p java-algs4 ThreeSumSuper
756
real         0.32
user         0.37
sys          0.06
java-algs4 RandomInts 4000 10000000 121 | time -p java-algs4 ThreeSumDeluxe
362
real         0.51
user         0.56
sys          0.06
java-algs4 RandomInts 4000 10000000 121 | time -p java-algs4 ThreeSumSuper
362
real         0.30
user         0.35
sys          0.05
java-algs4 RandomInts 50000 10000000 121 | time -p java-algs4 ThreeSumDeluxe
780515
real        43.37
user        43.36
sys          0.19
java-algs4 RandomInts 50000 10000000 121 | time -p java-algs4 ThreeSumSuper
780515
real         4.37
user         4.55
sys          0.09
java-algs4 RandomIntsPlain 10000 10000000 121 | time -p java-algs4 ThreeSumImproved
6282
real         5.21
user         5.28
sys          0.07
java-algs4 RandomIntsPlain 10000 10000000 121 | time -p java-algs4 ThreeSumSuper
6282
real         0.48
user         0.57
sys          0.06
java-algs4 RandomIntsPlain 20000 1000000000 121 | time -p java-algs4 ThreeSumImproved
503
real        21.54
user        21.57
sys          0.11
java-algs4 RandomIntsPlain 20000 1000000000 121 | time -p java-algs4 ThreeSumSuper
503
real         0.97
user         1.09
sys          0.06
java-algs4 RandomIntsPlain 20000 100000  121 | time -p java-algs4 ThreeSumImproved
5006256
real        22.80
user        22.82
sys          0.12
java-algs4 RandomIntsPlain 20000 100000  121 | time -p java-algs4 ThreeSumSuper
5006256
real         0.93
user         1.05
sys          0.07
java-algs4 RandomIntsPlain 50000 10000000 121 | time -p java-algs4 ThreeSumImproved
780536
real       142.62
user       142.26
sys          0.41
java-algs4 RandomIntsPlain 50000 10000000 121 | time -p java-algs4 ThreeSumSuper
780536
real         4.44
user         4.65
sys          0.08
java-algs4 RandomIntsPlain 7000 700000000 121 | time -p java-algs4 ThreeSumImproved
28
-697647641 118809027 578876357
-683740089 -4217219 688607910
-679184041 15283155 665029007
-613871365 165587779 448368501
-606818939 175866761 430972494
-585858356 -47880471 633743220
-582840248 277971463 304872418
-574379758 124622216 449786722
-565903006 -83120861 649086775
-557712621 -26654159 584409307
-470050679 -92986075 563421288
-465826454 -44790291 510869741
-457196328 -144012466 601324921
-421055756 123798587 297623396
-408384565 -101869448 510486030
-396087876 -122613889 519271036
-385930120 -286037150 671997427
-385658192 -174626017 560932755
-381656750 -13608340 395612986
-348658424 -92532979 441256213
-272330163 -35187619 307612274
-261377762 -42507645 304007530
-258744065 72149942 186656217
-226829166 101767464 125176763
-198372868 2130140 196262104
-151744497 -60490625 212851652
-87423667 -78725090 166186821
-43622720 -38171977 82141636
real         4.78
user         4.85
sys          0.08
java-algs4 RandomIntsPlain 7000 700000000 121 | time -p java-algs4 ThreeSumSuper
28
-43622720 -38171977 81794697
-226829166 101767464 125061702
-87423667 -78725090 166148757
-258744065 72149942 186594123
-198372868 2130140 196242728
-151744497 -60490625 212235122
-421055756 123798587 297257169
-261377762 -42507645 303885407
-582840248 277971463 304868785
-272330163 -35187619 307517782
-381656750 -13608340 395265090
-606818939 175866761 430952178
-348658424 -92532979 441191403
-613871365 165587779 448283586
-574379758 124622216 449757542
-408384565 -101869448 510254013
-465826454 -44790291 510616745
-396087876 -122613889 518701765
-385658192 -174626017 560284209
-470050679 -92986075 563036754
-697647641 118809027 578838614
-557712621 -26654159 584366780
-457196328 -144012466 601208794
-585858356 -47880471 633738827
-565903006 -83120861 649023867
-679184041 15283155 663900886
-385930120 -286037150 671967270
-683740089 -4217219 687957308
real         0.50
user         0.62
sys          0.06
java-algs4 RandomIntsPlain 7250 700000000 121 | time -p java-algs4 ThreeSumImproved
29
-697647641 118809027 578876357
-683740089 -4217219 688607910
-679184041 15283155 665029007
-613871365 165587779 448368501
-606818939 175866761 430972494
-585858356 -47880471 633743220
-582840248 277971463 304872418
-574379758 124622216 449786722
-565903006 -83120861 649086775
-557712621 -26654159 584409307
-470050679 -92986075 563421288
-465826454 -44790291 510869741
-457196328 -144012466 601324921
-421055756 123798587 297623396
-408384565 -101869448 510486030
-396087876 -122613889 519271036
-385930120 -286037150 671997427
-385658192 -174626017 560932755
-381656750 -13608340 395612986
-348658424 -92532979 441256213
-272330163 -35187619 307612274
-261377762 -42507645 304007530
-258744065 72149942 186656217
-243469668 -122652780 366724730
-226829166 101767464 125176763
-198372868 2130140 196262104
-151744497 -60490625 212851652
-87423667 -78725090 166186821
-43622720 -38171977 82141636
real         5.18
user         5.25
sys          0.08
java-algs4 RandomIntsPlain 7250 700000000 121 | time -p java-algs4 ThreeSumSuper
29
-43622720 -38171977 81794697
-226829166 101767464 125061702
-87423667 -78725090 166148757
-258744065 72149942 186594123
-198372868 2130140 196242728
-151744497 -60490625 212235122
-421055756 123798587 297257169
-261377762 -42507645 303885407
-582840248 277971463 304868785
-272330163 -35187619 307517782
-243469668 -122652780 366122448
-381656750 -13608340 395265090
-606818939 175866761 430952178
-348658424 -92532979 441191403
-613871365 165587779 448283586
-574379758 124622216 449757542
-408384565 -101869448 510254013
-465826454 -44790291 510616745
-396087876 -122613889 518701765
-385658192 -174626017 560284209
-470050679 -92986075 563036754
-697647641 118809027 578838614
-557712621 -26654159 584366780
-457196328 -144012466 601208794
-585858356 -47880471 633738827
-565903006 -83120861 649023867
-679184041 15283155 663900886
-385930120 -286037150 671967270
-683740089 -4217219 687957308
real         0.52
user         0.63
sys          0.06
java-algs4 RandomIntsPlain 7300 700000000 121 | time -p java-algs4 ThreeSumImproved
30
real         2.78
user         2.85
sys          0.08
java-algs4 RandomIntsPlain 7300 700000000 121 | time -p java-algs4 ThreeSumSuper
30
real         0.41
user         0.52
sys          0.06