QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#177016 | #6394. Turn on the Light | ucup-team1547# | AC ✓ | 2ms | 3728kb | C++20 | 1.0kb | 2023-09-12 14:10:29 | 2023-09-12 14:10:31 |
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Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 1ms
memory: 3728kb
input:
3 1 2 2
output:
? 1 ? 2 ? 3 ! 3
result:
ok Correct position at 3
Test #2:
score: 0
Accepted
time: 1ms
memory: 3720kb
input:
10 1 0 1 0 0
output:
? 1 ? 6 ? 2 ? 4 ? 3 ! 3
result:
ok Correct position at 3
Test #3:
score: 0
Accepted
time: 0ms
memory: 3632kb
input:
9 1 2 3 3
output:
? 1 ? 5 ? 7 ? 8 ! 8
result:
ok Correct position at 8
Test #4:
score: 0
Accepted
time: 1ms
memory: 3668kb
input:
8 1 0 1 1
output:
? 1 ? 5 ? 2 ? 3 ! 3
result:
ok Correct position at 3
Test #5:
score: 0
Accepted
time: 1ms
memory: 3588kb
input:
7 1 2 3 3
output:
? 1 ? 4 ? 6 ? 7 ! 7
result:
ok Correct position at 7
Test #6:
score: 0
Accepted
time: 1ms
memory: 3652kb
input:
6 1 0 1 1
output:
? 1 ? 4 ? 2 ? 3 ! 3
result:
ok Correct position at 3
Test #7:
score: 0
Accepted
time: 1ms
memory: 3648kb
input:
5 1 2 3 3
output:
? 1 ? 3 ? 4 ? 5 ! 5
result:
ok Correct position at 5
Test #8:
score: 0
Accepted
time: 1ms
memory: 3600kb
input:
4 1 1
output:
? 1 ? 3 ! 3
result:
ok Correct position at 3
Test #9:
score: 0
Accepted
time: 1ms
memory: 3588kb
input:
3 1 1
output:
? 1 ? 2 ! 2
result:
ok Correct position at 2
Test #10:
score: 0
Accepted
time: 0ms
memory: 3716kb
input:
2 1 1
output:
? 1 ? 2 ! 2
result:
ok Correct position at 2
Test #11:
score: 0
Accepted
time: 1ms
memory: 3720kb
input:
1 0
output:
? 1 ! 1
result:
ok Correct position at 1
Test #12:
score: 0
Accepted
time: 0ms
memory: 3728kb
input:
1000000 1 0 1 2 3 2 1 0 1 2 3 4 5 6 5 4 3 2 1 0 1 2 3 4 3 2 1 0 1 2 3 4 3 2 1 1
output:
? 1 ? 500001 ? 2 ? 250001 ? 375001 ? 437501 ? 437500 ? 437499 ? 375002 ? 406250 ? 421874 ? 429686 ? 433592 ? 435545 ? 436522 ? 436521 ? 436520 ? 436519 ? 436518 ? 436517 ? 435546 ? 436031 ? 436274 ? 436395 ? 436456 ? 436455 ? 436454 ? 436453 ? 436396 ? 436424 ? 436438 ? 436445 ? 436449 ? 436448 ? 43...
result:
ok Correct position at 436446
Test #13:
score: 0
Accepted
time: 1ms
memory: 3664kb
input:
999999 1 2 3 2 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 13 12 11 10 9 8 8
output:
? 1 ? 500000 ? 750000 ? 875000 ? 874999 ? 874998 ? 750001 ? 812499 ? 843748 ? 859373 ? 867185 ? 871091 ? 873044 ? 874021 ? 874509 ? 874753 ? 874875 ? 874936 ? 874967 ? 874982 ? 874990 ? 874989 ? 874988 ? 874987 ? 874986 ? 874985 ? 874984 ! 874984
result:
ok Correct position at 874984
Test #14:
score: 0
Accepted
time: 0ms
memory: 3592kb
input:
999998 1 0 1 0 1 0 1 0 1 2 3 4 5 6 5 4 3 2 1 0 1 2 3 4 3 2 1 0 1 2 3 4 3 2 1 1
output:
? 1 ? 500000 ? 2 ? 250001 ? 3 ? 125002 ? 4 ? 62503 ? 5 ? 31254 ? 46878 ? 54690 ? 58596 ? 60549 ? 61526 ? 61525 ? 61524 ? 61523 ? 61522 ? 61521 ? 60550 ? 61035 ? 61278 ? 61399 ? 61460 ? 61459 ? 61458 ? 61457 ? 61400 ? 61428 ? 61442 ? 61449 ? 61453 ? 61452 ? 61451 ? 61450 ! 61450
result:
ok Correct position at 61450
Test #15:
score: 0
Accepted
time: 1ms
memory: 3660kb
input:
999997 1 2 3 2 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 13 12 11 10 9 8 8
output:
? 1 ? 499999 ? 749998 ? 874998 ? 874997 ? 874996 ? 749999 ? 812497 ? 843746 ? 859371 ? 867183 ? 871089 ? 873042 ? 874019 ? 874507 ? 874751 ? 874873 ? 874934 ? 874965 ? 874980 ? 874988 ? 874987 ? 874986 ? 874985 ? 874984 ? 874983 ? 874982 ! 874982
result:
ok Correct position at 874982
Test #16:
score: 0
Accepted
time: 2ms
memory: 3636kb
input:
999996 1 0 1 2 3 2 1 0 1 2 3 4 5 6 5 4 3 2 1 0 1 2 3 4 3 2 1 0 1 2 3 4 3 2 1 1
output:
? 1 ? 499999 ? 2 ? 250000 ? 374999 ? 437499 ? 437498 ? 437497 ? 375000 ? 406248 ? 421872 ? 429684 ? 433590 ? 435543 ? 436520 ? 436519 ? 436518 ? 436517 ? 436516 ? 436515 ? 435544 ? 436029 ? 436272 ? 436393 ? 436454 ? 436453 ? 436452 ? 436451 ? 436394 ? 436422 ? 436436 ? 436443 ? 436447 ? 436446 ? 43...
result:
ok Correct position at 436444
Test #17:
score: 0
Accepted
time: 1ms
memory: 3652kb
input:
999995 1 2 3 4 5 4 3 2 1 0 1 2 3 4 3 2 1 0 1 2 3 2 1 0 1 2 3 4 5 6 7 7
output:
? 1 ? 499998 ? 749997 ? 874996 ? 937496 ? 968746 ? 968745 ? 968744 ? 968743 ? 968742 ? 937497 ? 953119 ? 960930 ? 964836 ? 966789 ? 966788 ? 966787 ? 966786 ? 964837 ? 965811 ? 966298 ? 966542 ? 966541 ? 966540 ? 966299 ? 966419 ? 966479 ? 966509 ? 966524 ? 966532 ? 966536 ? 966538 ! 966538
result:
ok Correct position at 966538
Test #18:
score: 0
Accepted
time: 1ms
memory: 3656kb
input:
999994 1 0 1 0 1 2 3 2 1 0 1 2 3 4 3 2 1 0 1 2 3 2 1 0 1 2 3 4 5 6 7 7
output:
? 1 ? 499998 ? 2 ? 250000 ? 3 ? 125001 ? 187500 ? 218750 ? 218749 ? 218748 ? 187501 ? 203124 ? 210936 ? 214842 ? 216795 ? 216794 ? 216793 ? 216792 ? 214843 ? 215817 ? 216304 ? 216548 ? 216547 ? 216546 ? 216305 ? 216425 ? 216485 ? 216515 ? 216530 ? 216538 ? 216542 ? 216544 ! 216544
result:
ok Correct position at 216544
Test #19:
score: 0
Accepted
time: 1ms
memory: 3716kb
input:
999993 1 2 3 4 5 4 3 2 1 0 1 2 3 4 3 2 1 0 1 2 3 2 1 0 1 2 3 4 5 6 7 7
output:
? 1 ? 499997 ? 749995 ? 874994 ? 937494 ? 968744 ? 968743 ? 968742 ? 968741 ? 968740 ? 937495 ? 953117 ? 960928 ? 964834 ? 966787 ? 966786 ? 966785 ? 966784 ? 964835 ? 965809 ? 966296 ? 966540 ? 966539 ? 966538 ? 966297 ? 966417 ? 966477 ? 966507 ? 966522 ? 966530 ? 966534 ? 966536 ! 966536
result:
ok Correct position at 966536
Test #20:
score: 0
Accepted
time: 0ms
memory: 3652kb
input:
999992 1 0 1 2 3 4 3 2 1 0 1 0 1 2 3 4 5 6 7 8 9 8 7 6 5 4 3 2 1 0 1 0 1 0 1 0 0
output:
? 1 ? 499997 ? 2 ? 249999 ? 374998 ? 437497 ? 468747 ? 468746 ? 468745 ? 468744 ? 437498 ? 453121 ? 437499 ? 445310 ? 449215 ? 451168 ? 452144 ? 452632 ? 452876 ? 452998 ? 453059 ? 453090 ? 453089 ? 453088 ? 453087 ? 453086 ? 453085 ? 453084 ? 453083 ? 453082 ? 453060 ? 453071 ? 453061 ? 453066 ? 45...
result:
ok Correct position at 453063
Test #21:
score: 0
Accepted
time: 0ms
memory: 3636kb
input:
999991 1 2 3 2 1 0 1 0 1 2 3 4 5 6 5 4 3 2 1 0 1 2 3 4 3 2 1 0 1 2 3 4 3 2 1 1
output:
? 1 ? 499996 ? 749994 ? 874993 ? 874992 ? 874991 ? 749995 ? 812493 ? 749996 ? 781244 ? 796868 ? 804680 ? 808586 ? 810539 ? 811516 ? 811515 ? 811514 ? 811513 ? 811512 ? 811511 ? 810540 ? 811025 ? 811268 ? 811389 ? 811450 ? 811449 ? 811448 ? 811447 ? 811390 ? 811418 ? 811432 ? 811439 ? 811443 ? 811442...
result:
ok Correct position at 811440
Test #22:
score: 0
Accepted
time: 1ms
memory: 3636kb
input:
1000000 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 2 3 4 5 5
output:
? 1 ? 500001 ? 2 ? 250001 ? 3 ? 125002 ? 4 ? 62503 ? 5 ? 31254 ? 6 ? 15630 ? 7 ? 7818 ? 8 ? 3913 ? 9 ? 1961 ? 10 ? 985 ? 11 ? 498 ? 12 ? 255 ? 13 ? 134 ? 14 ? 74 ? 15 ? 44 ? 16 ? 30 ? 37 ? 40 ? 42 ? 43 ! 43
result:
ok Correct position at 43
Test #23:
score: 0
Accepted
time: 0ms
memory: 3600kb
input:
999999 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 2 1 0 1 1
output:
? 1 ? 500000 ? 2 ? 250001 ? 3 ? 125002 ? 4 ? 62503 ? 5 ? 31254 ? 6 ? 15630 ? 7 ? 7818 ? 8 ? 3913 ? 9 ? 1961 ? 10 ? 985 ? 11 ? 498 ? 12 ? 255 ? 13 ? 134 ? 14 ? 74 ? 15 ? 44 ? 59 ? 58 ? 45 ? 51 ! 51
result:
ok Correct position at 51
Test #24:
score: 0
Accepted
time: 1ms
memory: 3728kb
input:
999998 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 2 1 0 1 1
output:
? 1 ? 500000 ? 2 ? 250001 ? 3 ? 125002 ? 4 ? 62503 ? 5 ? 31254 ? 6 ? 15630 ? 7 ? 7818 ? 8 ? 3913 ? 9 ? 1961 ? 10 ? 985 ? 11 ? 498 ? 12 ? 255 ? 13 ? 134 ? 14 ? 74 ? 15 ? 44 ? 59 ? 58 ? 45 ? 51 ! 51
result:
ok Correct position at 51
Test #25:
score: 0
Accepted
time: 0ms
memory: 3668kb
input:
999997 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 2 1 0 1 1
output:
? 1 ? 499999 ? 2 ? 250000 ? 3 ? 125001 ? 4 ? 62502 ? 5 ? 31253 ? 6 ? 15629 ? 7 ? 7818 ? 8 ? 3913 ? 9 ? 1961 ? 10 ? 985 ? 11 ? 498 ? 12 ? 255 ? 13 ? 134 ? 14 ? 74 ? 15 ? 44 ? 59 ? 58 ? 45 ? 51 ! 51
result:
ok Correct position at 51
Test #26:
score: 0
Accepted
time: 0ms
memory: 3596kb
input:
1000000 1 2 3 4 5 6 7 8 9 10 11 12 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1 0 1 0 1 2 3 4 3 3
output:
? 1 ? 500001 ? 750001 ? 875001 ? 937501 ? 968751 ? 984376 ? 992188 ? 996094 ? 998047 ? 999024 ? 999512 ? 999756 ? 999878 ? 999877 ? 999876 ? 999875 ? 999874 ? 999873 ? 999872 ? 999871 ? 999870 ? 999869 ? 999868 ? 999867 ? 999866 ? 999757 ? 999811 ? 999758 ? 999784 ? 999759 ? 999771 ? 999777 ? 999780...
result:
ok Correct position at 999781
Test #27:
score: 0
Accepted
time: 0ms
memory: 3724kb
input:
999999 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 15 14 13 12 12
output:
? 1 ? 500000 ? 750000 ? 875000 ? 937500 ? 968750 ? 984375 ? 992187 ? 996093 ? 998046 ? 999023 ? 999511 ? 999755 ? 999877 ? 999938 ? 999969 ? 999984 ? 999983 ? 999982 ? 999981 ? 999980 ! 999980
result:
ok Correct position at 999980
Test #28:
score: 0
Accepted
time: 0ms
memory: 3656kb
input:
999998 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 15 14 13 12 12
output:
? 1 ? 500000 ? 749999 ? 874999 ? 937499 ? 968749 ? 984374 ? 992186 ? 996092 ? 998045 ? 999022 ? 999510 ? 999754 ? 999876 ? 999937 ? 999968 ? 999983 ? 999982 ? 999981 ? 999980 ? 999979 ! 999979
result:
ok Correct position at 999979
Test #29:
score: 0
Accepted
time: 1ms
memory: 3656kb
input:
999997 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 15 14 13 12 12
output:
? 1 ? 499999 ? 749998 ? 874998 ? 937498 ? 968748 ? 984373 ? 992185 ? 996091 ? 998044 ? 999021 ? 999509 ? 999753 ? 999875 ? 999936 ? 999967 ? 999982 ? 999981 ? 999980 ? 999979 ? 999978 ! 999978
result:
ok Correct position at 999978
Test #30:
score: 0
Accepted
time: 1ms
memory: 3644kb
input:
1000000 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 1 0 1 2 3 3
output:
? 1 ? 500001 ? 2 ? 250001 ? 375001 ? 437501 ? 468751 ? 484376 ? 492188 ? 496094 ? 498047 ? 499024 ? 499512 ? 499756 ? 499878 ? 499939 ? 499970 ? 499969 ? 499968 ? 499967 ? 499966 ? 499965 ? 499964 ? 499963 ? 499962 ? 499961 ? 499960 ? 499959 ? 499958 ? 499957 ? 499940 ? 499948 ? 499941 ? 499944 ? 49...
result:
ok Correct position at 499947
Test #31:
score: 0
Accepted
time: 1ms
memory: 3664kb
input:
999999 1 2 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 2 3 4 5 5
output:
? 1 ? 500000 ? 750000 ? 749999 ? 500001 ? 625000 ? 500002 ? 562501 ? 500003 ? 531252 ? 500004 ? 515628 ? 500005 ? 507816 ? 500006 ? 503911 ? 500007 ? 501959 ? 500008 ? 500983 ? 500009 ? 500496 ? 500010 ? 500253 ? 500011 ? 500132 ? 500012 ? 500072 ? 500013 ? 500042 ? 500057 ? 500064 ? 500068 ? 500070...
result:
ok Correct position at 500070
Test #32:
score: 0
Accepted
time: 0ms
memory: 3648kb
input:
999998 1 2 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 2 1 0 1 0 1 0 1 0 0
output:
? 1 ? 500000 ? 749999 ? 749998 ? 500001 ? 624999 ? 500002 ? 562500 ? 500003 ? 531251 ? 500004 ? 515627 ? 500005 ? 507816 ? 500006 ? 503911 ? 500007 ? 501959 ? 500008 ? 500983 ? 500009 ? 500496 ? 500010 ? 500253 ? 500011 ? 500132 ? 500012 ? 500072 ? 500102 ? 500101 ? 500073 ? 500087 ? 500074 ? 500080...
result:
ok Correct position at 500076
Test #33:
score: 0
Accepted
time: 1ms
memory: 3720kb
input:
999997 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 13 12 11 11
output:
? 1 ? 499999 ? 2 ? 250000 ? 374999 ? 437499 ? 468749 ? 484374 ? 492186 ? 496092 ? 498045 ? 499022 ? 499510 ? 499754 ? 499876 ? 499937 ? 499968 ? 499967 ? 499966 ? 499965 ! 499965
result:
ok Correct position at 499965
Test #34:
score: 0
Accepted
time: 1ms
memory: 3584kb
input:
1000000 1 0 1 2 1 0 1 0 1 0 1 0 1 2 1 0 1 0 1 2 1 0 1 0 1 0 1 0 1 2 1 0 1 2 3 2 2
output:
? 1 ? 500001 ? 2 ? 250001 ? 375001 ? 375000 ? 250002 ? 312501 ? 250003 ? 281252 ? 250004 ? 265628 ? 250005 ? 257816 ? 261722 ? 261721 ? 257817 ? 259769 ? 257818 ? 258793 ? 259281 ? 259280 ? 258794 ? 259037 ? 258795 ? 258916 ? 258796 ? 258856 ? 258797 ? 258826 ? 258841 ? 258840 ? 258827 ? 258833 ? 25...
result:
ok Correct position at 258837
Test #35:
score: 0
Accepted
time: 1ms
memory: 3640kb
input:
999999 1 2 1 0 1 0 1 0 1 0 1 0 1 2 1 0 1 0 1 2 1 0 1 0 1 0 1 0 1 2 1 0 1 2 3 2 2
output:
? 1 ? 500000 ? 750000 ? 749999 ? 500001 ? 625000 ? 500002 ? 562501 ? 500003 ? 531252 ? 500004 ? 515628 ? 500005 ? 507816 ? 511722 ? 511721 ? 507817 ? 509769 ? 507818 ? 508793 ? 509281 ? 509280 ? 508794 ? 509037 ? 508795 ? 508916 ? 508796 ? 508856 ? 508797 ? 508826 ? 508841 ? 508840 ? 508827 ? 508833...
result:
ok Correct position at 508837
Test #36:
score: 0
Accepted
time: 0ms
memory: 3660kb
input:
999998 1 0 1 0 1 0 1 0 1 0 1 0 1 2 1 0 1 0 1 2 1 0 1 0 1 0 1 0 1 2 1 0 1 2 3 2 2
output:
? 1 ? 500000 ? 2 ? 250001 ? 3 ? 125002 ? 4 ? 62503 ? 5 ? 31254 ? 6 ? 15630 ? 7 ? 7818 ? 11724 ? 11723 ? 7819 ? 9771 ? 7820 ? 8795 ? 9283 ? 9282 ? 8796 ? 9039 ? 8797 ? 8918 ? 8798 ? 8858 ? 8799 ? 8828 ? 8843 ? 8842 ? 8829 ? 8835 ? 8838 ? 8840 ? 8839 ! 8839
result:
ok Correct position at 8839
Test #37:
score: 0
Accepted
time: 1ms
memory: 3560kb
input:
999997 1 2 3 2 1 0 1 2 3 2 1 0 1 0 1 0 1 0 1 2 1 0 1 0 1 0 1 0 1 2 1 0 1 2 3 2 2
output:
? 1 ? 499999 ? 749998 ? 874998 ? 874997 ? 874996 ? 749999 ? 812497 ? 843746 ? 859371 ? 859370 ? 859369 ? 843747 ? 851558 ? 843748 ? 847653 ? 843749 ? 845701 ? 843750 ? 844725 ? 845213 ? 845212 ? 844726 ? 844969 ? 844727 ? 844848 ? 844728 ? 844788 ? 844729 ? 844758 ? 844773 ? 844772 ? 844759 ? 844765...
result:
ok Correct position at 844769
Test #38:
score: 0
Accepted
time: 0ms
memory: 3668kb
input:
1000000 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 20
output:
? 1 ? 500001 ? 750001 ? 875001 ? 937501 ? 968751 ? 984376 ? 992188 ? 996094 ? 998047 ? 999024 ? 999512 ? 999756 ? 999878 ? 999939 ? 999970 ? 999985 ? 999993 ? 999997 ? 999999 ? 1000000 ! 1000000
result:
ok Correct position at 1000000
Test #39:
score: 0
Accepted
time: 0ms
memory: 3716kb
input:
999999 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 20
output:
? 1 ? 500000 ? 750000 ? 875000 ? 937500 ? 968750 ? 984375 ? 992187 ? 996093 ? 998046 ? 999023 ? 999511 ? 999755 ? 999877 ? 999938 ? 999969 ? 999984 ? 999992 ? 999996 ? 999998 ? 999999 ! 999999
result:
ok Correct position at 999999
Test #40:
score: 0
Accepted
time: 1ms
memory: 3640kb
input:
999998 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 20
output:
? 1 ? 500000 ? 749999 ? 874999 ? 937499 ? 968749 ? 984374 ? 992186 ? 996092 ? 998045 ? 999022 ? 999510 ? 999754 ? 999876 ? 999937 ? 999968 ? 999983 ? 999991 ? 999995 ? 999997 ? 999998 ! 999998
result:
ok Correct position at 999998
Test #41:
score: 0
Accepted
time: 1ms
memory: 3652kb
input:
999997 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 20
output:
? 1 ? 499999 ? 749998 ? 874998 ? 937498 ? 968748 ? 984373 ? 992185 ? 996091 ? 998044 ? 999021 ? 999509 ? 999753 ? 999875 ? 999936 ? 999967 ? 999982 ? 999990 ? 999994 ? 999996 ? 999997 ! 999997
result:
ok Correct position at 999997
Test #42:
score: 0
Accepted
time: 1ms
memory: 3596kb
input:
1000000 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 20
output:
? 1 ? 500001 ? 750001 ? 875001 ? 937501 ? 968751 ? 984376 ? 992188 ? 996094 ? 998047 ? 999024 ? 999512 ? 999756 ? 999878 ? 999939 ? 999970 ? 999985 ? 999993 ? 999997 ? 999999 ? 1000000 ! 1000000
result:
ok Correct position at 1000000
Test #43:
score: 0
Accepted
time: 1ms
memory: 3640kb
input:
1000000 0
output:
? 1 ! 1
result:
ok Correct position at 1