# Cops

## Understanding slicing

Remember, slices are zero-indexed. Take this slice: [2:]. If the string is "abcde", the result is "cde" because the slice basically means "get all elements with an index greater than 2." Let's try [1:3]. If there is an end slice, the end slice is not included. (excluded) Therefore, the result is "bc". What about [::2]? [::2] means "take every second element", so the result is "ace".

Note: This is not a list of all the slicing features. For more info, see here.

Cops, your job is to write to a program, that when sliced, will input a string and reverse it. The slice could be something like [::-1][2::6] which means "reverse the code, then get each sixth char starting from index 2."

The unsliced program must be valid code, and it does not need to do anything. It may not take any input. A valid program is a program that does not have anything in STDERR.

You must specify the number of slices. Both the unsliced and the sliced programs must be non-empty. You must include a slice.

## Scoring

Your score is the following: $$(sum of start slices*2 + sum of end slices*2 + sum of step slices*3) * code size in bytes before slice$$

All fragments not included default to zero. Negative slices are made positive (-1 => 1, -2 => 2, ...)

Lowest score wins.

The tiebreaker is code size. Cracked answers are ineligible for scoring or winning.

• I feel like there's a pretty good argument that any chain of slices can be compressed into one. Commented Feb 9, 2022 at 20:21
• @dingledooper Yeah, just like any product of cycles can be compressed into a permutation. But that's beside the point. I agree with you in all seriousness, and I believe the challenge should probably be scored by the simplicity of the slice instead, that is, the numbers involved, whether it's a slice like 5:, ::5, 4::5, 6:5::3 etc. Commented Feb 9, 2022 at 20:24
• Why larger code is better for score?
– l4m2
Commented Feb 9, 2022 at 20:46

# Python 3.8 (pre-release), 1026 bytes, Cracked

"""#ipepfrvr iai nln t(tT=4(rp9iur2nei3p:n)u t4t
#(pd2)re3[if7:n 4:tg8: (2-=o31e)7]v:4)ae0;lx%p e3r(c2i"(8n "1t "7(e.3ixj0nio2pti1u"n7t)(4(#me) ae[npe:o(v:tcv- hv1 ra]o,aapmanealdnpl" (lN s(o u"pum¤e ,#!ez#"xi%)ip¤;t(#p m%roa¤irp"n (#t o!((r"i d¤ne,#pv"!uai%tlk#()b")(g")"m#;1!)p4b3r"g3i)i3n
n1t#m3( !3)N\3;O"1i
T3n 33p 33u &1to*3(pV3)e\3;n"1p "3p )3ro,3rr91i 93i1*3n5[3n*o1t ]3ti)3(d)3(()1i )3i )3ni
3nnx1pt=3p(03u
3uic1tnl3tta3((s3(is1)n 3)tf3[ :3[(
1:i 3:nd3-te31(f1]  3]i_3)d_3)(d1; e3p l3pp_3pr_1pi(3pns3pte3p(l1p f3pp)3pr:3pig1rn(3rtx3r()3r[
1r1y3r1,3r1x3r]=1r[f3r:(3i1)3i2,1i373i] 3i[i3i:f1i5 3n503n5 3n5e1n5l3n-s3t1e3t1 1t123t1 3t1i3t1f1t1 3i103i1 3i1e1i1l3n]s3n)e3n) 1n)83p) 3p)i3p)f1p) 3p)03p# 3p1e)u1l3u;s3u
e3u
;u
33u
3u
i3t
f;t  et 0et  et evt lvt svt eat  at 4at  lt ilt flt  (t 0(t  (p exp lxposxpoe)po )po6)pk ;pkiepkfelk elk0xl( xl)exl)lel)selieeli cli6cei ceii(eif(ed (ed0xed xadexadl)ads)a(e)s( ;s)78s) 7s)i4spf3s. 2e.09er 8e.e4e.l7eis9e.e2e. 3
n27
. 4
.i9
tf2
. 7
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( 4
.e9
.l2#is3p.e7T. 4rn99"""


Try it online!

Uhh, have fun I guess. Still not super difficult. (one slice is enough, just like for every other answer). This code contains non-ascii unicode characters. Those should be treated as one unit (not be broken up). If you use pythons slicing, and the source code is not a bytestring, you should be fine.

• Great reference! Commented Feb 10, 2022 at 9:34
• @ophact whats the reference? Commented Feb 10, 2022 at 15:16
• @BgilMidol a subslice of my answer is a substring of opchats answer Commented Feb 10, 2022 at 19:49
• cracked
– ovs
Commented Feb 14, 2022 at 12:52

# Python 3, 181 bytes, Cracked

if   True:  print =eval ('  exit')# not  open   u
exit or  ( eval)('14')
# NO

open  or 15* id(  int( int(int (int( id(  print( print([111][:123][:55555-11111111111]))))))))#11;


Try it online!

Much easier than you think.

Slices: 1

• Are you sure that there is input? Commented Feb 9, 2022 at 20:12
• @Fmbalbuena If sliced, then yes. Commented Feb 9, 2022 at 20:12
• Cracked Commented Feb 9, 2022 at 20:32
• @AnttiP Great job! I knew I could have hidden it better. Commented Feb 9, 2022 at 20:34

# Vyxal, 22 bytes, 1 slice, cracked by lyxal

Ǎ⟑(hn\++Rnẋ::ws=ß⅛)¾∑t


Try it Online!

For once I decided not to take advantage of some strange quirk of Vyxal that only I know exists and instead did a normal Vyxal cop answer. Enjoy!

Lyxal found the exact slice I used. Nice.

• Cracked Commented Feb 9, 2022 at 22:22

# Vyxal, 18 bytes, 1 slice, cracked by lyxal

»ż⟩" 3⅛⇩Cİµ×∷İ»kPτ


Try it Online!

Should be fairly easy but I'll see if y'all get this one.

• cracked Commented Feb 10, 2022 at 5:32

# brainfuck, 37 bytes, Cracked

[,[[[+]>+[>++<+],[-].[<],[--.+[<]]]]]


Try it online!

1 Slice. Easy as the question itself make cops easily brute-forced

• cracked Commented Feb 9, 2022 at 22:28
• Actually cracked Commented Feb 10, 2022 at 8:44

# Python 3, 784 bytes, Cracked

"""Dntii(():n1n]ron):1i(]n)-(::n~rutnp1:p:l1('pn:np(-()n[i[t(r-:t~::rtn:p n1lp1::1]]ippy]iri(1[)1pi]noi)r[):)]epipnu:[tpp((:n~n:n ))s(1peu)pa-pwt[nr:nn+ru:)ii]itu
ii1([)1)sp(:tu-li(+)(thi
sn(rdp]1nit tuatt:aip:p]ntiu(turerp[pnthat[](1r]iip+:i(lii(p.upu1eesp[ne
:np]rait upn:u:in)
eutwpt
t:1dn(iir(opt(1s]tat+irert[i()esi1:rink)p(r1:.pn(r[]etnntt:sple:-idnt)[pp(un(ini?p1n:
(enpit)1 ei[ir(t((snup=i:np:[iei+u((=i)ttnnriu)(tn=ti[tn[w[tp:n)=ntnpnu.(pi
u:=+t::-tt:nnn(]=n)pi(
u[1trep>pn(s:uots:]nn prrtptd]
pupupprpnapt1iptrtrn)pr]ns[:[r(pii::inr.:isp[)nnnu~e(sitpplnt1((
nn
e~:[ei(aspsu(sp+p(:-i[l[:)t iitn]pn(:et[rs[(nt)tp:n(rnpapttra(u[n:ptt n-eiunt(nts~(stsi(]u(psripnyntpirp)]p:ti(stnnprp[tuenii nurepl:ti(r1ptpi)(1a-(:nn(-rip](1t1t
rtt1oinp:11]tntrnup)r]ni:)(n)([]mpn[:is 1t([ppi"""


Try it online!

Only needs one slice

• Cracked
– l4m2
Commented Feb 10, 2022 at 4:03

# Vyxal, 47 bytes, 1 slice, cracked by lyxal

»β₀₇⁽sßḋ∪₁ĿɖC↵‡_Ẋ\$ƛµ"√₀tṠ⟇¤H∧+(Ȧfꜝ⁼∑↵dTḋI∷›»kpτ


Try it Online!

A bit harder.

• Cracked Commented Feb 10, 2022 at 7:44

# Python 3, 10000 bytes, Cracked

#u]]nppt]1ii:up]ppnt[::((pn-)p]]nt)1:u[[]1it][p-n--p]t1i:t-p[(1i(-[tp)upppti--[upnt::p):up]:]1)(u1nn[-p1)tt:ppnt1np](-)()puu(:-p[[u(:::1pt:u)[11[ui][]ip(pn)]pptpiip(-u(t-:uittp-t-p-it-u:1n-[:p]n:[upup:n)pup-:tun[n:pn)i:ptu:1i)ippnpnpu):pn:]:nn:1-ip)1p(t:t(-ttn]t:p)(:u[[]t[)utu::(i--tt)1p:u1)p(u(ppt-[)([u]u-[p]ptitu)[t:iii-]ui(-ipp-pppn(ip-(-pip]nu(ui1-)p(pu-1n)up[-p:-tppp1u:t-:p1tnp((:1[n[-nt1]):t[))i-t:ppn:[[1)p(]1uu1p(1(un(uupi[:]])]):pi-pp1u(t(pp1-]uu]u[n-t:ti-1u1-iut]1))(tpp)n-pi[u1-))t(u[1n)[ut:ppn-:1t11ttn(1]iupi[p)11]pt1]ntni:]ipu(u-n-i(p[1)(]i1:i]t]n:]1:[p[:]nu[[11)t]1)i]n[it:p]:tp))()n:p-(tt-tpup(1])n1]1nu)([u11i:u)pp1(pp)tnp)[((:[[1[][1[()ipnp)u[1[p1un)])[(p(nu[[(ip:1:--tttp[u1[p(ptnp1tpp(1p[]-]]i[-nuntnpun(1t:tp-ppp1tt[n[]uun]np1u):p)pt[[-n:[1i[n(uu[n:i(t:p)[p-:pi)(pp1--]p)u)t)nupt[[)(u(i)[:](tp-[([p-:np]-[uii--u:)::p-p:]t1i](-)p1tp1p)[tu]-[-tt[n[1-]]1(i(t](i(uppup-)ii-u[u)p[i[)(nt([]i]1[:u1])i]1]u[np[ntnut]i1)t)tii(n]-1pt)itp)p]p-p1unu:n]((1]-]-[(-](tnpupp:-p[u][:]upp:tu1p1t11u1u[]pptpui1pt[)i(i]pi[n)]u1iu[i1u[p:(ppp)(:u(p)(inn](-)[tnp[p-uun)(-putpp)-ttui:1u[pit(p1p]-:[[n[uu)1i:tpu[u)n(ppiup:[)ppip(tp:)t(1t]](::)[n1:1tn(utu[[---)n]npp-tpp]in](::):tpt1)(pt1tu:[-ppupi(-u)-:1t(upn-(1-p:)):1t]:pt-p(p(t):-1u:[u[:i)():1(1))tn[utn:n1)t1pt1iu:)[tp-(:(:-(1:[)pu]-in)p)[]]tpp1tnnp)-pu1i[pu-ip]ii]pt:i](t()[1p(-)-t[pu[()i[t1-)tp)pn::pupnpipti-:[):upi1[1]i:]nu:p]p:[pt([t[pu-n1((-](](p[iu-u1t)u)p)1iiuu)[)]-nun]]pn:[t[1[nnputu-un]npt:u(up))):11)1]i(:n[)(-[t)]tip[ppi[-p:p)::-]n:](p-()t(ppp)p)tnp)1uu:(nipuitt)-:1--1p]un-pp:ui:up:t:n)n]]n)[(:tu]ippi]:[tp1in:])[]t-)i]1-p-)[ttp]u1:(1in):(pppipi:p11)p[u11:)i](-)i:):np-[1ppn:n[:-:[p))i]ntt-[ip(-pip11ptp:)n)pp-(]:[:t:)p-p(u1)p[n-[[]p(utup])i11:t(](p[1-(pp-:npn[:p-u1itu([[up][in(p-pup)t:(u]ui-pp[[t::((pu]]pt1u[:()t:n):-p]-uui]pt[:][1)t1t:(p(ipnpn[-1:))-[]pn1]]:in((ni)niu](-npn(n-:-:n:ut():)pp]1uu)p1::]i()[n))i]])(:[inin[]t-t--npi(ni-1t)-:])--:ut]pn1(tupp]np1:p)]u[:[(1iu)1-ip:1[tp1[p(:p])1u1-1nu1-p1-1t)-pu1(:1)]up1[]n::)]--()pp[1pu-)p1)p1np-]in:)pipt[t1t1n)1:(p:]tni[i(uu:u-11]p1(])nup(tpnp]p[)n:1-[p-1t:-:](u)1it[]-u1ip1]1pi-pii)[)(n(tt:p()(([]n-ttp(i([p1()np)]t1]t:u]nt1p(1)[1puunit)(u[ipp)(p])tpp]p-ii:n:-p][pu[-t:(::i[:u]ti)(:u][(:pp)ni([ip[][1[i1)p(pp(11)]1ti1p]-nn)](u(t(nui1pun)pp:u([[nppi]1]]ti:t-(p1[it:t):tn-(pu1i)pp(:ttnpi(]p]-[][p)u[-u)nini(i[:p:]-i)(t1--:1[:[[:u)[-pi:[)[-ppp)u)u(upp)]pt1[ti](()1[p(-upp(1(i][p:1u]t(i(1]u(u(p-::1tt]n]p:t11p[n1()ni-[n-n-p1-:::t[(pp[u]))n)))p)upnptup]:-:[:(-((-[[p-t[n[]:u]nn-1t[p-t[-)t-pp1iu])-:p:p)-p[:(n(::in[pt:upip):-u:][u[1--up1p:)(-:[(in)1(t]-:t:p:)t)[1:t)unp:-pituiu1[n[-np-p]:(ppup[np[)p)-u[i-u-([)(](tpi-n)(ntpp:p:t())ntp)[ui-uu:[1up:1][:p:p(n]u1t:]iin[tn[ipn)pip-u])t)t-]tp(:1:i]tp))tuu:1pupi([nu]pu:]])p(u-:1pii1-(1[:tunn[pp(up(p(pin)ptp-)]]]p)(tu(p-p1)11:i]i]i-:1it1[(tn1n([]()ut-]:it)[)i1:(p]]nni)(p[tpp)[p:[p-n::(ut1iin)[n-1-nin]:-u-p-]((i]:p--)1npnt)i:(-]n1]pu-]ittpp(1-pp-[(11i)pu1-:()()uittuu):pui(n(:-nn[(1]1tp)([][]pt)tt1:n[ii1np]]([p[-ut[1n](t]ppt[[)1(i(up]tttt1p):)p)ut)(u([:]-[[[i[nn(nnitiu)1(:[ntti[ti([-up:[iu]]]-pu]1(ii)-npppt-]n((pp)u]p-][:t]ui1ui]]t-[()-)[-:]pnpni-np(p:pp1pt[1i]up11ip]n)u(:(nn-pu)u-uutu]]:n1u1u)p-1[1npppi)u-[[p:n:-(]iu)tp[:u:tun[i:n]p-p:1t][:(u(npnpiin-ttp)]ii:-1:tu]inp(puupn-)1p-p:uuuu[-][([]1np1](1(]]-])ni1pu-(-([p]i:--ip(i[iptu-(-iiiup1))up-pp[-)-)[i1pp-ip1[-up:p1[[n)pi1[1upnup(:nt:t](up][)[:p1tn1pun[:tuni[[[ii(--)u1]p)111pu[[)pp[ni1n1)t::pu-)]:n:n)-(1[[t-]n[p)pp1up)n)p]n[pu]u]u])]-p(i-i[)pnpp[(t)(:[i[(][([p1p(-]1n:-]1[np-n1)[n])uu-in:(n(:p)]-1iup-u-)t]]utt[)][p-:-]u-pt](p[u1-1[:-1:ipi)p[()p(p1)nppt-]:11u-]-it-(pup:p-ti[(1p[ptu-u1n:]--p]:))(pptnu)ip[pi:pt1p[(-iunppu1tn(1)))1((t-]t1]u:ut):1)[tt](ptp-[u[uu(u-ip]-ip]-u]nnu:i-(-p-in:u[()(t:n(ptu)t(n-[:-1iptinip11(t1[u]11][-t]p(t[u)uuttnu-n([-(nun[[u]u)t[iuitn)u-(()pnu)pt-:-]i[u1:uni):ptpt-p()it-pptp-[t::ntpn-p:(1(-(]p)][u-p:n(i)n[up]][-[n[nppn-i(]p1:n1[)ti)p(t--:(u[[))n-t:(:t1ip11pp:)[)t(ut-pun[ui]:((pp]pp)t]-[--p)1:1p[)t(n::u)t:-]:)n:])]([][n)(u1(-)-:]1[(ppt](n1u:t1up)(:[niup[-]pi:u[u[pp:-ut]]:(()i)t1]:p:[-]p-](])1tp]n-p-p)n:i(u1]pp[pn(p]]pnp]pn:ti][npn-t:[::t1()p)-i)]ip]:tu)nt)tpnutp)([(i-p[p[upppt]nn:nu)(it(p]pup]i1[)u)-)()u)n1:in::())1]p1p-i]t[[p]i)1([p]-p(p:i-[utp[:uii-pi-]1[iput[pu]p-t[-u)iiu:p1:1:tinptupi1ip[n((1pn]p(t)111ppptti]tu:pppui-ti1:np(i-[t[1p[(t())p[[t-u)t]puu([p::n:np]tpu[]:u]1pnpt1:u(pp)p)u1]1i)1(n:1-nnpt:])-i[(t[t[[:)[([it)1]:i))t1p][upt[]1-p:pp:[:n]]:[]nt-i])u((pu))t)[1it)ii(1:nt-)u](p::1n[p1:)u:p:()nip(n[[1uu])p)u-piunt[p(]1]pp-t-:i1u:u-pp1tpu]np-:()(:1[p:)]:[npuu]])1i)n1-1:1int-tp:(nu1][i-1t]11[[un1n1[)]pi:t(]uuiu[u-iiut1n:p)(ipn-()n(p(pu)pp1t)niu1n1i(nt(1p]-:1[[ppp-t]ut:p[-[1]np[upin[(u1u(()[]][:t[ppu)([pi1u)p--(][)(]-:)n[t[p1i(:)pi:(pu[tn-pipnptnp(tpp-uiui1p())pu::u:p:uu[u1pt)-1)-)t(ntuit:(-p((-pt-p(i(p]))[(tp1n)]:]p(ip[]p:p1tu]:-1:ti]-i:u]t(:u1)]:i[))1(t)][uupnn-1[uu-pt(pn((---(p[p)t(ip-:pp([u[-n]-):i(unpi1:]p1n:-1ni:uu]pp]-tppp[t]p1p:(n:])u-)p:p-:ppu[p-([)u1(p[uu[i]i][:-:)1[-t-1[u1n11inpptpi(pi)u[]p]ii1(n1[n-n(pn1pinp(iu(p[-]-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


Good luck! A single slice will suffice.

• This produces error which is not allowed. (unsliced) Commented Feb 9, 2022 at 23:39
• This is invalid as the unsliced code must be syntactically valid though it does not have to do anything and may not take input. Commented Feb 10, 2022 at 0:03
• Missed that, fixed Commented Feb 10, 2022 at 1:47
• Cracked Commented Feb 10, 2022 at 8:35

# Python 3, 9999 bytes; Cracked by AnttiP

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Try it online!

A single slice. This is 99 lines, 100 printable character and 1 line break character each line.

• Cracked Commented Feb 10, 2022 at 20:26

# Vyxal, 233 bytes, safe.

NZɾ√√₁₆₂‛‛ẋȯWġ₴ẏ.tṗṫ⟩εpj*5;[[kromer]]ȮGβŻ∇QQ↳ꜝ^QJ∧A⇩≬[pipis]fWPėX℅dżT←›Ṗ‡[[BIG SHOT]]!ṗȯḃ•I[[classic vyxal jankness]]Ẋėṅ⋏HðβėEV3RY BUDDY 'S FAVORITE [[Number 1 Rated Salesman1997]] ṁẏ℅□ṁQḃ₌ŻKKQTẇλε λ½ no ₃≠ Ḣ¥s in λλ square ʀ¬ of 2


Try it Online!

Maybe if I add enough deltarune references Lyxal will get distracted...

The solution was simply Ṗt - of all permutations, get the last. [72:18:-1] I think. Idk what the score is.

• How many slices? Commented Feb 10, 2022 at 8:25
• @lyxal A single one will suffice, as with all of them Commented Feb 11, 2022 at 4:35

# Symbolic Python, 10001 bytes

One slice, score is probably horrible, but maybe a bit more difficult to brute-force. The input is taken as a quoted command-line argument (like this).

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_____()+-__+_++_+=+-__/=_*_______,____=___'__________[-__-[*_--**=_*____+__([*___=__=_+_-+*_+_-___-__+__=__*___]__*[_)_-+_____,___']___,___[__*)_,>=__-_______*__)<__=-_*%;__==+*_-_%____-_);_____'<___-___[__-_________[__'____=__+_'''__[__>=__+;__(________;_____-+_=_*____=*______;,]*,__*-_++*___]_____*'_*=__=_=__+%___,__+_*__*_____]_=[_+__[_>____>(_+_________]__)]_____*_%______-________*+___)>+__(+__-=_______>_____+_)_]_*__*(_*_____(___]_*+*___;_)*___]_____+_______*'__%___-__=%,____'+_[_=*________-___+__-____;(>____++_<_'__-__*_+(*);'__++_-__=_--__(__*_%-____*____*)___+___+;___%*__=*_',[_____=_;,>_*_;-_>=__[_=_)+__'_(,*_*]<________*_*_(,__-_;_-___(______)[(_)___'*>-_+_](____);__+_*___*___;___=_=)%+__]_;_-___-____+_[+_;)___[____=_*___)_,>__*_]____+]__==__[_________'_=_**___(__+___;__+()_____%__[*_=-_*___[+__*<,__-__'-____**+*_;__;+_____*]<__'__(++_____-_'______;;__*__[_______]____[(_____+(_,_;[)'_);___;____)___)+_<_]<_+__'________*____________++_=____++_+__(___'=___________[*____-=___+_]_=**]_[________%_____;__=___%;____(__-___,_+____=_*%__>____,_;[_)>*'_%_(%____*__=;+___%*__(*___=_'(__'_____+)___*___+_;_-__+*>__*__+[__+_*,_)___=)]_)__%________(+_+*___*)+__;+)__*_';,*-)>]_)____]_*__*)(]*__+___>_,[_____===%_*_,____-_;_;*_=__])+__'%=**______;>__+____+___;[_;_)__)__+*______[__[________*____*_''___*=__=___=*__][_*>]_]_+___=__*______+_]_*___,_______'_____-__%__*__*___;]_=+%__+___']_<'_=__])______]___(_%______'%____+__,_+____[__-___*;__,_*_______*[-__(_*_%_*[__=_+%[)+__+=]__*>_____+-____;__*__,_+_-_*__*___)___*__+_=_=______[_]_+[=_+_*__'-_]_+)[+_'_____-____+_]_______'_____;__['__*=*_+_____<_*_+-_(_+_=_++'________+,_____-__-='*+;_='_[___*____(+(,_______*-_)-_;*_*;=-(_=[%_=___=________%___[_+*_(___->+_*_+___+__%%=______+)-)->___;-_<__)=;___+(__(____*+___>__')[_+_+%_'];_-____[;--___,=__=____+_;_=__,_____)_]+___(+=-+___=,*++*+____'_____=;*____>+_______<;_**_____,___*_'_'__+(_)_____+__(_=__;____*__*_-_]*___-___]___>]]__=_____%__+__=_______(__%+_______*__-,_+**___>**_*+__)__+=_++*____________(__)____%___+(_+_**_*___+;-;_(___'<_)*__++,____;,*______=____[)_+__+**_*__+___]_+-_;___%(++___-___[___=_%_;__*_____-_<_-__(_+__-,__+__]____-+___+_*_+_(%___*'___*_[(++*+__;;*_____+;'____[*__==__+_*'___-_*_+_=*____*)<___[**___+__<__,+-[__*(__]_=_;__;____['___+__;'*-__-)___)_-(-+_+=_*____+______=[__*_'(+=______,+*_)____[_-_]____**+(]_____%__+__+____+__)____[*______[)__;*-_+_<__'___=_=___*____[_)___+,=(___+%__+*__>______%____''_<+_;______-_]__+[_]_[+(=__%*_____,,*________*__-_=-<-____,(__%;_______]_*+__-__[________-*_=____[]_*__+_+__;;____+++__,_,''__]-___-__]=_<__;_____)%+____-_(_)[_*_+_____,_,_______*_-+____(________*_____==-_(__*__);*____-+_,_=+_________'____]%__-<+=_[____)_________=___'=_________+___;[__>_;_-_+=%___=,____*]+___=*________/;)+=___*__(>___+__-)__=_____*-+__-__*(__[__-<__,__)_]+%_)_+__;_);_+_(_[___,__=*%_=_-___*_____=__=](_=_=____)_+_%+_-_+____[_+_+__(________=_____'___+=_=______+<;+_+__+_+___'+'_,_;____=__-_+_'_*__++_____*/___%*)__[*_-__)+____'___[_____=___[<*=______-_)___*/=______*_____*__*__-'-[____'_+______________-____+__%_-+__;__*________-__%,(_______%______,_______(_=___[__+;*__=_+,';_______+_____'_(]_+))____'*________**_;____;_*'________'__=*_______;____(_-)__>_____)_[_(+*__'__*___**+______+;__;_%_____=__=_]_;_'+/__[______;;)_-<______-___=_;-(*_*[+'_'___[=___%,)*__,____%___*_]''>'_'%_______+__+_;'________',+___*__+**_______-__===______'_____+__'_=_*[____*_%__(__[___*,__,-___(,+__>+_____-]-__;_=____'[*______+'___]*_*__*___<'[<___'_<_)__+(__*_*_,+;*_*__+(__-_*+___%_=%]____+__*__*__>_)_)=+_(____%__;+;,;_____+]__,_[);*____=_*+________-==*'_>_]'-_<_]=_______'*_+______+__-_=__'______+__)*-_+*_'_,[_+__=__(____**_;__''__________*-_%_________-_++___'__%)+___(]___%__=__=+_____)*-__*[___+_-=_%]____;_____*__>*__**[(_*___+_[;_[_(__'_____+___;-___**__+)_+*_'*_=__+<_'___**_=*___=__'+;*;;____**<*____)_______+_+________-__+_____-_+________]_)_*___________+_;_*%_;=*,[__________,____=_<[-___*_____,'__-__*_+_-_'_*_-+_[_--+_+=_[((_+___+_;__;_<+__(=_;+_+____;_<_*__*+_+_;_,_____(_[_*_+____,(_;__-___;___*_;_'___+=____,_______=_;*'%_[*+__,______'%)=;___*+___;]__[_+_____=_=*_;_+___%'[____-_*_-____<*____[=______*%__,)__>_'___,<____+__>__(__***,__,__**___+)'+__=__;])__,____%*____%___[__+*______*_'=__]_[;_(;_____*]_%==__%____%,______%___)_)_*_*%__'__)_)+_*_-__-_]____+_(__=_______-,______=(*+[_,___-___(_>______*%*=___+_'__[___*_,_*____*___%____,___,_________<_]__%___(,_'<_________+_+_*[=__+-__+;__'*[+])'_____*_*+_;+(___+___+_+___*_=__,__-_=-%_(%_'=_______*____*_)_=_]__*_++]*__'-_)________=[___+__+=%*[__+*++__'__*_______,_+(___+_*__)_*____=_*]'_______+<_*_+__*-__-*__;]_'__<____,_____%*'_;_=)________;___-____*_____)*==___-__-_='___<____*__+'____=_=_[___%_)______=____________=__<____(_+*+___*_(__]____]_%'[_-[_______''__*______*___[*_-__________>__-=)_;___'___=____',____*_*+__,_%[____%____+__*_%____+_)*__'____;*-__*_(_=*+,_=*/+___


Try it online!

• Unless _=_[::-(_>_)] (given by code[12:42:2]) is the answer, I honestly have no idea. Commented Feb 14, 2022 at 11:31
• @AnttiP that fails for inputs like " abc", where the string is not larger than it's representation. I think I'll add some hints later today, this might be a bit too hard.
– ovs
Commented Feb 14, 2022 at 12:10
• that's what I thought, thanks Commented Feb 14, 2022 at 12:11

# Python 3, 235 bytes, 1 slice

#xn=t'(esvtarl('s.turp(pienrp(u)t.(l)o[w:e:r-(1)].[t:i:t-l1e]([):.:l-o1w]e[r:(]));)e)v#axl=('xe)v(a'lx'#.'u*p7p0e-r0(+)0.-l2o+w2e-r4(-)4.+t8i)t;lper(i)n.tl(oswterr((s)t;re(vianlp(uxt)(()'[x:#:'-*17]0[-:0:+-01-]2[+:2:--41-]4[+:8]));)p)r


Try it online!

• Cracked Commented Feb 11, 2022 at 19:34
• @AnttiP not intended. but i changed my answer. Commented Feb 11, 2022 at 19:40
• Cracked again Commented Feb 14, 2022 at 10:26

# Python 3, 1121 bytes

c#5c#cl#7a#cs#5s#s #9P#5r#si# n#it#te#8r#r:#2
#e #a #8 #2 #s@#ss#tt#1a# t#1i# c#7m#ie#5t#2h#oo#5d#2
#h #i #  #5 #3d#te#3f#1 #oa#s(#fb#8l#2a#rh#6)#1:#2
#2 #l #7 #2 #2 #l #a #4 #tr# e#7t#3u#3r#4n#  #:b#bl# a# h#9[# :#3:#4-#61#1]#2
#r
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#9c# l#
a#1s# s#s #lI#7n#ip#du#et#3H#8a#8n# d#8l#7e# r#::#n
#  #b #1 #7 #8@#rs# t#1a#5t#9i#5c#7m#@e#rt#ch# o#cd#6
#n #1 #o #a # d# e#5f#t #la#o(#ea#8,#  #6b#8,#c # c#4,#8 #ad# )#c:#5
#4 #5 #8 #1 #3 #3 #e #  #ct# r# y#d:#1
#7 #a #4 #5 #6 #8 #7 #: #  #8 #e #3 #1a#
+#ub# +#cc#r+#
d#4[#71#5:#a4#6:#s2#
]#5 #t #5##d #11#a-#:1#1-#41#8-#71#t-#81#6-#61#
-#e1#a-#41#1-#51#3
#e #: #3 #  #t #I #8 #4 #se#3x# c# e#3p#et#1:#m
#7 #2 #, #t #9 #  #  #1 #b #: #- #5 #4p#,a# s#4s#8
#t #5 #5 #3 #2 #9 #4 #1 #,r#te#5t#4u# r#rn#: #-i#:n#ap#[u#:t#3(#6)#
#  #s #) #8 #7 #3 #: #+ #:
#9
#np#1r#7i# n#7t#l(#6P# r#3i#Pn#2t#te#:r#2.#8a#2(#)O# n#lp#7u#7t#8H#4a#8n#7d#sl# e#rr#t.#4a#1(#2N#io#9n#2e#2,#  #:N#1o#5n#8e#5,#5 #5N#6o#2n# e#t,#f #5N#-o#on#8e#5)#+)# )#5 #  #)##7 #ra#2r#,g#3h#a #1t#2y#5p#7o#h
#(e#1x#3e#7c#4(#8"#5p# r#5i# n#2t#8.#3_#8_#ic#6a#el#9l#9_# _#9(#3i#cn#rp#ru#4t#9(#()#p[#7:# :# -#e1#o]#5)#n"#5)



Try it online!

I hope this is hard. One slice.

• To be sure, the intended solution is not [4::5] (which only contains two mistakes that could be rectified with one byte each)? Commented Feb 14, 2022 at 16:23
• @ophact No. Can you please send a link to the result? Commented Feb 14, 2022 at 16:33
• TIO link to result Commented Feb 14, 2022 at 16:54
• Cracked the new version Commented Feb 14, 2022 at 16:59