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Technical Article => Programming =>  C

Do you really understand C? 21st International Obfuscated C Code Contest winning entries

  sonic0002      2012-10-25 12:26:55      7,515    0    0

The 21st International Obfuscated C Code Contest(IOCCC) officially launched the winning source code. IOCCC requires contestants to write the most creative and the most obfuscated C codes with the size limited to 4kb and less Work of each participant is impressive. The winners, including one French, one Korean, five Americans, one Belgian, one Israeli, one British, four Japanese and one Chinese.

Here we list some codes:

Best short program

Seonghoon Kang  from Korea- Decodes spelled out numbers

long long n,u,m,b;main(e,r)char **r;{f\
or(;n++||(e=getchar()|32)>=0;b="ynwtsflrabg"[n%=11]-e?b:b*8+
n)for(r=b%64-25;e<47&&b;b/=8)for(n=19;n;n["1+DIY/.K430x9\
G(kC["]-42&255^b||(m+=n>15?n:n>9?m%u*~-u:~(int)r?n+
!(int)r*16:n*16,b=0))u=1ll<<6177%n--*4;printf("%llx\n",m);}

Most functional

John Tromp from US - Lambda interpreter

       Int L[A],m,b,*D=A,
        *c,*a=L,C,*U=L,u;s
         (_){u--&&s(a=*a);}
          char*B,I,O;S(){b=b
           --?b:m|read(0,&I,1
            )-1;return~I>>b&1;
             }k(l,u){for(;l<=u;
              U-L<A?*U++=46^l++[
               "-,&,,/.--/,:-,'/"
               ".-,-,,/.-,*,//..,"
              ]:exit(5));}p(Int*m){
             return!*U?*m=S()?U++,!S
            ()?m[1]=p(++U),2:3:1,p(U)
           :S()?U+=2:p(U[1]++),U-m;}x(
          c){k(7*!b,9);*U++=b&&S();c&&x
         (b);}d(Int*l){--l[1]||d(l[d(*l),
        *l=B,B=l,2]);}main(e){for(k(10,33
       ),a[4]-=m=e-2&7,a[23]=p(U),b=0;;e-2
      ?e?e-3?s(D=a),C=a  [3],++1[a=a[2]],d(
     D):c?D=c,c=*D,*D=    a,a=D:exit(L[C+1])
    :C--<23?C=u+m&1?O      =O+O|C&1,9:write(m
   ||(O=C+28),&O,1)+        1:(S(),x(0<b++?k(0,
  6),U[-5]=96:0)):(          D=B?B:calloc(4,X))
 ?B=*D,*D=c,c=D,D[            2]=a,a[++D[1]]++,D
[3]=++C+u:exit(6)              )e=L[C++],u=L[C];}

Most surreptitious

Don Yang from US - Encodes text as a C program

                                                      #include<stdio.h>
                                                typedef unsigned int _;_ d,b,
                                           #define i(I1,Il,lI)if(Il){lI;}else{I1;}
                                         I[256],            n,y,a,r,u,k,o
                                       ,L,l[                    256],O,K[
                                      /**/                        #define\
                                      q(g)                        g char\
                                      *C,                           *Q,c[\
                                      ]=                              "KfW"\
                                      ""                            "Ww|"\
                                       /*                               'UU!\
                                        %                                 NYA!\
                                        */                                   "Z}"\
                                 ";fRo?JtJaV<x4@*?R?&JV1"                         ".s"\
                             "{Fyj2_;khB1xQ5oxm~mS@B|(pa>oRU"                          "Ro"\
                          "nB}h@o?)d.X)NSTIUCz7@%",*s[]={c,"#en"                        "di"\
                       "f/*}||1;\n__DATA__\40*/\n\n#ifndef\40q\n#d"                         "ef"\
                      "ine\x20q\n#include<stdio.h>\ntypedef\40unsign"                           "e"\
                    "d\x20int\x20_;_\x20K[]={\n#include\40__FILE__\n#u"                        "n"\
                   "def q","0},L,O,l[256],I[256],n,y,a,r,u,k,o;"#g"char"                     "*"\
                 "S,s[]=\"",c,c,"\";int main(){X();for(S=s+*K;*S>37;){for"                     "(o"\
                "=0;o<5;o++)r=r*85+(83+*S++)%89;r","^=*x();for(o=0;o<4;o++"                      ")"\
                "{s[O++]=r&255;r>>=8;}}return!fwrite(s,O-*S%5,1,stdout);}\n"                       "#"\
               "endif",c},S[256]="#ifdef/*\n'true'\40or\40q{\nexec\40head\40"                       "-"\
              "8\40$0\n};for(open$O,$0;<$O>;print\40if$f){$f|=/^$/;}q{*/q",/*                        */z;
              256];q(_*x(){if(!L--){y+=++a;for(o=0;o<256;y=l[o++]=I[255&(k>>10                        )]+u
              ){n^=(o&1)?n>>(( o& 2)?16:6):n<<((o&2)?2:13);u=I[o];k=I[o]=I[255&                        (u>>
             2)]+(n+=I[(o+128)  &   255]) +y;}L=255;}return&l[L];}_*X(){for(O=0                        ;256
            >O;I[O++]=0);for(O   =     0;   sizeof(K)/sizeof( _)> O;O++)I[O&255]                    ^=K[
            O];for(n=y=a=L=O=0 ;O<1<<24;++   O)x( );r=O=0x0; return&O;})int/*^^*/                    main
           (int p,char**P){FILE* Z=fopen(p>    (+  1)?P[01   ]   :"/dev/urandom",                    "rb"
          );i(;,Z,O=fread(K,256  ,4,Z);/*P          */     fclose(Z))X();for(p=b=d                    =O=
          0;O<256;K[O++]=0)*K=+  86;for(O                =1;12> O;K[O++]=*x());X();                    for
         (C=Q=S;r-8;){i(*C++=34,  (r-4&&r               -5)||C- S ,;)z=Q[p++];i(;,z                    !=
        32||r-3,i(i(C+=sprintf((    C),                 "%uU"    ",",K[b++]);i(d=1;C                   =S
       ;i(d=02,b-12,;),b%6,;),r-1                       ,i(b=   fread(c,1,4,stdin);i                   (p
       =O=0,b,for(d=O=0;O<04;O++)d                             +=(c[O]&255)<<(8*O);d                  ^=
      *x();for(p=5;p;c[--p]=O<32?O+                            95:O+6){O=d%85;d/=85;}                 O=
     5)i(d=0,b<4,c[O++]=b?b-1?b-2?36:      37:33:35           ;d=2)c[O]=0,r-4,i(i (d=                 2
    |d,C!=S+6,*C++=(*x()%34)+93;p--),r      -5,*s=          C;d|=2)  )),z ,i(*C++ =92                ,
   z-63||C [-1]-63||C>S+76,;)*C++=z))i(                   ;,d>1,d=  d-2  ;Q=s[r]  ;i(                   ;
  ,r<3||  r>5,d=1;i(;,r-1, *C=0)C=S)  i(;,            r-4, p=0)++   r)   i(*(C++ )=
 34,r    <4||r>5||   C<S+    78,;)i       (*C++=0;d=1; C=S   ,r<3       ||       r>
5        ||C<S+     79,;      )i(;,d,                         puts               (
        S);         d=0      )}  return
                                      0;}

Most useful obfuscation

Qiming HOU from China - Syntax highlighter

#include <stdio.h>
#include <string.h>

#define Q(B,q,b) s=j[B]; e=*s; *s=0; printf(q,b,b,b); *s=e; H=s;
#define W(a,b) r[O].c=a,r[O].f=b,O++
#define X(B) { int y=A; B; A=y; }
#define R return
#define M 1<<18
#define If char
#define fi "%s"
#define IF for
#define FI "r"
#define long
#define do










typedef  struct { int c,(*f)(); If*t,*h; } T; T*a,*r; int I[M],c[M]={'\0'} ,n
,N,i do,p ; char*s,*H,*z[M],f[M],o[M ],*_ [M ],**l =_ ,e ; int O=6,A='\5',x=5
,y='\0',g=2;k(p){a[p+2].h=H; R p+2; } S(p){ a[I[n++]=a[p].c>>8].h=H; return ~
p-'\1';}J(p){R~a[p].c>>8;}C(){ A=O; W(O+1<<8,J); } B(p){ c[g+'\1']=O;C(do);c[
g+='\2']='\0';R 1;}h(p){ Z(p); r[O-3].c+=256; R 1; } V(){ *I=n='\1'; for(; *a
->t; do ){do a->t=a[1].h=s; IF(i=N=0; i<n; i++){ p=I[i]; H=a[p ]do.h;for(; p>
0&&a[do p].t-s;){a[p].h&&a[p].h-H>0&&(H=a[p].h);e=a[p].c;a[p].t=s;p=do e&&e-*
s?p+'\1':~a[p].f(p);}p<0&&(I[N++]=~p);}n=N;s++;}}U(p){X(D(p)); c[g+='\2']=O ;
 return Z(p); } d(p){ C(); W(0,k); W(0,J); R 1 ; } q (p ){ C (); X (for(;*++s
!='\"'; )F(p); ); return 1; } Z(p){ r[A].c =O +1 <<'\10'; r [A ].f  =do J   ;
 { int y=A; W(O+*"\2void"<<8 ,J ); C (); W (y*1 + "signed" [ 6 ] +1 <<'\10',S
  do   )do ; } return  '\1';} F(p){ R*s?C(),*s==*"\\&"  long&&*++do s  do  ==
 'n'&&(*do s  =*"\nextern"),W (*s ,k ),W ( (4+5)["volatile*"],J),'\1'  :'\0';
} E(p){ int V =*"\0float"; C (); X(s++;V=(*s++==*"^double");c[g+=long 2]long=
0;s-=!V;for(; *s!="]int"[0];s++){e=*s;s+=2*(s[1]==*"-for" ); s=s;for(;e<=do*s
; e++){long C(); V?W(e,J):(W(e,k),W(0,J),U(p)); } } d(p); V||(W('\0',J)); D(p
); ); return 1; } j(p){ If*r=z[a[p].c>>8],**D=l; IF(; l-_&&l [-*"\2$"]-H>=0&&
(l [-*"\1do"]!=s||l[-2]!=H||r-l[-3]<=0); )l -=3 ; l ==_ ||l [-*"\1if("] -H <=
0 * !"\0auto"?*l++=r,*l++=H,*l++=s,l:(l=D); R 0; } L(p){ W(A +*"\1for"<<8,S);
R 1+*"\0while"; } Y (p ){ z [y ]do=++do s  do; s=strchr (s ,*"\nshort");W(y++
<< *"\btypedef",j); r [x ].c =O  long<<'\10'; r [x ].f =S ; do x =O do ; C  (
); return   '\1'; } D (p ){ r [c [g ]].c =O <<8 ; c [g ]='\0';A=c[--do g]; --
g; return *"\1switch"; } T  b [ 12 + (M) + 321 ]={ {'\0','\0',"-"},{'*',Z } ,
{ '+',L},{ '\"',q} ,{ '['long ,E } ,{ 70-94+ do '@'do ,B } ,{ ')',D } do,{124

                  ,U},
                 {46,d}
                  ,{32
                  ,Y},
                {63,h},{
               0,F},{0,0,          "Make a contract with me"
              },{'('*32,S}
             ,{'\0',k},{0,J,     "and become a magical girl! "
            },{'@'*4,J},{0,J
            },{'@',0} };main
           (  int B,If**j){ a
           =b;if(B>=3){s=f;r=
          b+'\14'; f[fread(f,1,
          M,fopen(j[1],FI))]=0;
          V(); W(0,J); IF(i=0;
          i<y;i++){*strchr(z[i
           ],10)=0;}o[fread(s
            =o,1,M,fopen(j[2
             ],FI))]=0; a=r
               ;V(); H=o;
         IF( j=_;j!=l; j+=3 ){Q
         (1,fi,H);Q(2,*j,j[1]);
          }printf(fi,H);}R 0;}

Best use of cocoa - Bronze award

Daniel Vik from US - Steganography

#include <stdio.h>
#include <string.h>
#include "zlib.h"




      int
    i,j,k,l
  ,m,n,Q,W,H,
 B,Z,Y,X,O=1<<24
  ; char*A[999],x[
   1<<24],z[1<<24],
     s[1<<24],t[2<<24
         ],w[2<<24],*E;
           uLong N;  FILE
             *f ; int  main(
                int c,char**v){
                  unsigned char**V
                     =(unsigned char
                        **)v; for(m=0;
                            c==-11&&m<H
                              ; m++, (*v)
                                +=m%3==0&&
                                (B&4) ,V[4]
                                 ++) n=m%W,
                                  l=n?l:*(*V
                                  )++,*V[4]=
                                   !(B&2)&&
                                    n%3?V[4
                                    ][-1]:
                                     (i=
                                    n<3?0:
                                  V[4][-3],j
                                =m/W?V[4][-W
                               ]:0,Z=k=!(m/W)
                              ||n<3?0:V[4][-3
                             -W],*(*V)+++(l?l
                             -1?l-2?l-3?(X=j-
                             Z,X=X>0?X:-X,Y=i-
                            Z,Y=Y>0?Y:-Y,Z=i+j
                            -Z-Z,Z=Z>0?Z:-Z,X>Y
                           ||X>Z?Y   >Z?k:j:i):
                           (i+j)    /2:j:i:0));
                          for(     E=t+O; *v-1[v]
                         &&c==   -16; ++*v)n=**v,n
                         -62?   n-60?n  -91?n-93||!
                        m||    !*E?*    v:(*v=A[--m+9
                       ]):    (A[9+    m++]=*v-1):--E
                      :++       E      ,n-43?n-44?n-45?
                     n-        46    ?0:putchar(*E):--*E
                   :(*       E=     getchar()):++*E; for(;
                   7<       -c     &&11>-c&&*v!=5[v]; ++*v)
                 **V      =c     +8?c+9?*V[1]++<<6|56:**V|~3
                &*V     [1]     ++:**V>>6; for(; m<n*2; m+=2)c
              +18?    c+19      ?0:(V[1][m/8]+=(*V[0] ++-56)>>m
             %8)     :(*       V[1]++=V[0][m/8]<<m%8 ); return !
           c?c:     c>0       ?n=main(-7,(Q=**++v,N=0x49444154,*A
         =s+4,    main      (-128   ,A),A[1]=*++v,A  [4]=z,*A=x,A))
        ,c=A[    6]         -x-    12,Q-101?main(-19,(main(-10,(A[5]=
       t+n,    *A=          t,   A[1]=z,A)),*A=t,A  [1]=w,A)):main(-9,(
      main(   -8                ,((n=main(-7,(A[1]   =*++v,A[4]=t,*A=s+4,
    A)))<0               ?      main     (-18,(n=  -n,*A=s,A[1]=t,A)):0,A[
    5]=t+n            ,*A=     t,A)      ),*A=t,  A[1]=z,A)),98-Q?E=memcmp(
   w,s,4              )?      n+=       main(-22  ,(*A=z,A[1    ]=t,A[2]=t+n
  ,A)),            N=n=     main     (-23,(*A=t, A[1]=z,A[2       ]=z+n,A)),
  memmove         (x+      c+n+12   ,x+c,12),memcpy(x+c+8,t,     n),main(-128
  ,(*A=          x+c       +4,A))   ,N=crc32(    0,memcpy(x       +c+4,s,4),n
 +4),           main       (-128,   (*A=x+c+     n+12,A)),n       +=c+24,x:(n=
 strlen         (w        +4),w+4),fwrite(E     ,1,n,stdout):  main(-16,(*A=w,
 A[1]=w    +H, A))       :-c>31?main(c+=32     ,(*--*v=N,N>>=8,v)):-++c<4?(-c)
 [*V]+256*main(c,v    ):c+23?c+22?c+21?c+6?c+5?c+4?0:(N=O,uncompress(*v=s+4,&N
  ,v[3],v[2]-v[3]   ),main(c-7,v),H):(n-=l=main(-4,v)+12,5[*v]-68?(v[6]=(*v+=
  l)):(memcpy(v[2],*v+8,l-12),v[2]+=l-12,memmove(*v,*v+l,n)),main(c-(n>8),v))
  :(n=  main(-24,v),main(-4,v)-0x89504e47?-H:main(c,(*v+=16,W=main(-4,v)*3,*v
   +=       4,H=main(-4,v)*W,B=(*v)[5],(*v)[5]=2,N=crc32(0,*v-    8,17),*v+=
    13         ,main(-128,v),v[3]=v[2]=w+O,*v-=21,v))):(*      *v=0,memcpy
     (++*v            ,v[1],W),*v+=W,v[1]+=W,                1+main((v[1]
      !=v[2])                                            *--c,v)):(N=O
         ,compress(*v,&N,                    v[1],v[2]-v[1]),N):(f=
              fopen(v[1],"rb"))?fclose((n=fread(*v,1,O,f),f)),
                      n[*v]=0,n:(strcpy(*v,v[1]),0); }

Most elementary use of C - Silver award

Tsukasa Hamano from Japan - PDF with little dancing men

                          #define  \
                        D(s)"<<"#s">>"
                      #define  q(s)p(#s)
                     #define S " endobj "
                    #define Y "endstream"S
                    #include     <stdio.h>
                    #define  o(s) b[s]=_;\
                     p("%u    0  obj",s);
#define E for         (c=d;c  < 123;c++)
  #define DANCE         "trailer   "D\
    (/Root 3 0            R /Size %d)            "\nstartxref %u %%%%EOF\n*/"
      #define              p(s, ...)             _+=printf(s,  ##__VA_ARGS__)
       #define C         "<</Type/Page         /Parent %d %d R /Resources <<\
        /ProcSet[       /PDF/Text]/Font       <</U"D(/Subtype/Type1/BaseFont\
          /Courier) "  /T<</Subtype/Type3   /FontBBox[0 0 10 10]/FontMatrix[\
           %f 0 0 %f 0 0]/FirstChar %d/LastChar %d/Encoding<</Differences[%d"
            typedef int N;typedef char*Nyan;typedef char A;N a,b[64],d=65,_,v
              [32]={84,0,64,282,90,74,330,85,93,173,167,176,80,208,81,13,7,87
                ,160,346,32,128,170,218,16,26}; Nyan w[]={"+*-(,&-&","+*,&-&"
                  ,"+*.&/&","+*/*/+","+*())'('"  ,"+**&)&","+*(&'&","+*'*'+",
                    "","+,./","+,-,./","+--,+*"  ,"","+,(/","+,),(/","+-),+*"
                     ,"10 0 d0 ","8 7 2 2 re "   ,"+*+.'`'@'mi +/+/(mi"};Nyan
                       nyan(Nyan _,N y,A n){
                        N g=v[~-y%32];Nyan
                         s=w[g>>n&3|n*2];
                         for(a=0;*_=*s++;
                         a++,_++,*_++=32)
                         {*_+=*_-32?10:0;
                         if(a%2&&*_/16==3
                         ){if(g>>8)*_=105-*_;
                        _++;*_++=32;*_=~-a&&a-13
                        ?108:109;}}return n?n-9?nyan
                       (_,y,n-2):_:nyan(_+=~y&' '?sprintf
                      (_,17[w]):0,y,9);}N main(N c){A e[256];
                     p("/*%%PDF-1.3%%*/")-2;q(#include<stdio.h>\n);
                    q(#define o *_++&& *_-41\n#define);p(" endstream ");q
                   (main(){for(;*_++;      *_-40?:putchar(o?*_:o?10:41));\n)
                  ;q(#define  endobj          return 0;}\n);q(typedef int ET;/)
                 ;q(*);o(1)*b=~(p(D                 (/Length 2 0 R)"stream\n"))
                ;for(p("BT 12 818"                    " Td/%c 12 Tf 12 TL%%%c/"
               "static char*_=\""                       " \\\n",7[v],*v/2);c=
              getchar(),~c;c-10?                         p("/%c 12 Tf(\\%o)"
             "Tj",v[~-c%' '<25[                         v]&&!~-(~-c/'@')?0
            :7],c):(p("()'")))                         ;p("%%\";\nET ");*
           b-=~_;p(Y"/*");E{a                         =nyan(e+sprintf(e,
          16[w]),c,6)-e;o(c-                         59)p(D(/Length %d)
         "stream\n%s"Y,a,e)                         ;}o(2)p(" %u"S,*b);
        o(3)p(D(/Pages 4 0                         R)S);o(4)p(D(/Count
       1/MediaBox[0 0 595                         842]/Kids[5 0 R])S)
      ;o(5)p(C,4,0,6e-2,                         6e-2f,d,122,d);E p(
     "/%c",~-c/6+~14?c:                         d);q(]>>/CharProcs<<)
    ;E if(~-c/6+~14)p(                           "/%c %d 0 R",c,c+~58);
   for(q(>>/Widths[),                             c=59;--c;p(" 10"));a=p
  ("]>>>>>>/Contents 1                              0 R>>"S);for(p("xref\
 0 %d ",--d);c<d;p("%010u\
 %05d n  ",*(c+++b),NULL));
  return!(p(DANCE,d,a));}

Balanced use of obfuscation - Gold award

Adar Zeitak from  Isarel - Brace matcher

#include <stdio.h>
#include <stdlib.h>
#define s(_)sizeof(_)
#define n void*
#define z(_)_,_,_
#define x (s*)__
#define y (s*)_
#define h C(y,y)
#define o &d
#define t() (p)
#define w(_)_,_
typedef n (*(*(*(*p)(n,n))(n,n))(n,n))(n,n);
typedef struct s { struct s* a       ; struct s* UNUSED; } s;
typedef struct t { struct s* UNUSED; struct s* a     ; } *t;
n __(n _,n __)     { return  _;}n _(n _,n __){return __; }
typedef unsigned char e;
#define _(_)((*_).a)

                                   s*
                                   w,
                               a={x     ,x},
                               b={x     ,y},
   c={y,x},d={y,y};s l[]={&b,&d,w       (w(w(w(w(w(&d)))))),w(&d),&c,&d,w(w(w(
   &d))),&c,w(&b),&d,&a,z(&d),z(w       (w(w(w(w(&d)))))),&b,&b,w(&d),&a,&b,w(&
  d),                                                                        z(w
 (w(                                                                         w(w

    (&d))))),w(w(w(&d))), &b,&c,&d, &d,&a,&c ,w(w(&d)), &c,z(&b) ,w(&d),w(&a)
    };s* C(s* a, s* b) {s* _=malloc(s(s));_(_)=a;_((t)_)=b;return _;}e k2=s(l
    );p                                                                      f(p
    a,p                                                                       b)
   
                 {     e k;s d;p v,r,             q,i,C,c,u,g,m=t(    )
_               (   _(_(w)));C=t()            _(_(&l[fread(&k,s(e      )
,s              (      e),stdin)]));v               =C(_,__);d=l[k=(e   )
C             (     k2,k)];c=(u=a(                      b,_),i=(t()_((t    )
_           (   _(w))))(_,_(_(o))                ),(a(_(_((t)o)),(t(      )
_          (      _((t)o)))(_,__)                       ))(b(_((t)_((t)o)   )
,         (     t()_((t)_((t)o)))                      (_,__)),_));{p a=t(    )
_         (     (t)_(o));{p b=                             C(_,i(u(_,__),_)    )
;        {    p u=C(_,(t()_(_(o)                       ))(_,__));_(_(_(w))     )
=       (   s*)i(__,_(_(                                  _(w))));r=b(m(c,_      )
,C       (   m(_,(t()_((                                  t)_(_(w))))(_,__)      )
,      (      f)));v=b(_,v);i                              =b(a(_,__),_);g=(b   )
      (      a(m(c(_,__),__                                ),_),_);q=u(_((t   )
_     (     o)),_)((t()_(                                     (t)_(_(w))))((t(    )
_     (     _((t)o)))(_(_((t                               )_(w))),(t()_(_((t    )
_     (     w))))(_,__))(                                     _,__),_)(_,__),_    )
;_     (     _((t)_(w)))                   =               (s*)u(_((t)_(o)),_    )
     (     (t()_((t)_(_(w))))                              (_,__),_)(_(_((t)o)    )
,_     (     _((t)_(w))));}                                   }_((t)_(_(w)))=(s*    )
q     (     a=(t()_((t)_(_(w)))                        )(_,__),_((t)_(_(w)))    )
     ;     fwrite((k=k,&k2)                                 ,s(e),u(_,g)(s(e    )
,     (     e)s(s[s(s[s(s[s                                (s)])])])),stdout    )
      ;      fwrite((k2=k,&k)                               ,s(e),u(__,g)(s(e   )
,      (      e)s(s[s(s[s(s[s                               (s)])])])),stdout   )
;_      (      _(_((t)w)))=(s*)                             u((t()_(_(_((t)w)))   )
       (   _,__),_(_(_((t)w                              ))));_(_((t)_(w))      )
=       (   s*)q(a(_(_((t)                              o)),_(_((t)_(w)))      )
,_        (    _((t)_(w))));}                          _((t)_(_((t)w)))=(s*     )
         (     t()_(_(_((t)w)))                        )(_((t)_(_((t)w))    )
,u          (      (t()_((t)_(_((                      t)w))))(_,__),_((t   )
_           (   _((t)w)))));g                       =u((q=u(C(__,(t(      )
_            (    _(_((t)w))))(_((t               )_(_((t)w))),_)),_)     )
             (     _,__),g);v=g(                      __,i(u(_,i(f,_)    )
               (   _(_((t)o)),_(                (t)_((t)o))),v)      )

       ,r=                                                                 q(_
       ,g(                                                                 f,i
       (v(f,(_(_(_(w)))=(s*)m,_)),r)));return q(_,v)(r(g(__,a),g(__,b)),r);}

      int                                                                   main
       (){w=C(C(h,h),C(h,h));return       printf((e*)f(_,_)("OK\n","\n ^ Error\n"
                                  ""  ))
                                    ;}

Reference : http://www.guokr.com/post/364973/

C OBSFUCATION CONTEST

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