Language: C

adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}

Compiler output:
main.c:1:1: error: unknown type name 'adouble'; did you mean 'double'?
    1 | adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}
      | ^~~~~~~
      | double
main.c:1:29: warning: data definition has no type or storage class
    1 | adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}
      |                             ^
main.c:1:29: error: type defaults to 'int' in declaration of 'n' [-Wimplicit-int]
main.c:1:31: error: type defaults to 'int' in declaration of 'i' [-Wimplicit-int]
    1 | adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}
      |                               ^
main.c:1:33: error: type defaults to 'int' in declaration of 'j' [-Wimplicit-int]
    1 | adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}
      |                                 ^
main.c:1:35: error: type defaults to 'int' in declaration of 'k' [-Wimplicit-int]
    1 | adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}
      |                                   ^
main.c:1:37: error: type defaults to 'int' in declaration of 'c' [-Wimplicit-int]
    1 | adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}
      |                                     ^
main.c:1:39: error: return type defaults to 'int' [-Wimplicit-int]
    1 | adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}
      |                                       ^~~~
main.c: In function 'main':
main.c:1:39: error: type of 'm' defaults to 'int' [-Wimplicit-int]
main.c:1:54: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    1 | adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}
      |                                                      ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}
main.c:1:54: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    1 | adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}
      |                                                      ^~~~~
main.c:1:54: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:1:73: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    1 | adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}
      |                                                                         ^~~~~~
main.c:1:73: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:73: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:1:73: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:159: error: implicit declaration of function 'acos' [-Wimplicit-function-declaration]
    1 | adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}
      |                                                                                                                                                               ^~~~
main.c:1:1: note: include '<math.h>' or provide a declaration of 'acos'
  +++ |+#include <math.h>
    1 | adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}
main.c:1:159: warning: incompatible implicit declaration of built-in function 'acos' [-Wbuiltin-declaration-mismatch]
    1 | adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}
      |                                                                                                                                                               ^~~~
main.c:1:159: note: include '<math.h>' or provide a declaration of 'acos'
main.c:1:164: error: implicit declaration of function 'hypot' [-Wimplicit-function-declaration]
    1 | adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}
      |                                                                                                                                                                    ^~~~~
main.c:1:164: note: include '<math.h>' or provide a declaration of 'hypot'
main.c:1:164: warning: incompatible implicit declaration of built-in function 'hypot' [-Wbuiltin-declaration-mismatch]
main.c:1:164: note: include '<math.h>' or provide a declaration of 'hypot'
main.c:1:203: error: implicit declaration of function 'atan2' [-Wimplicit-function-declaration]
    1 | adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}
      |                                                                                                                                                                                                           ^~~~~
main.c:1:203: note: include '<math.h>' or provide a declaration of 'atan2'
main.c:1:203: warning: incompatible implicit declaration of built-in function 'atan2' [-Wbuiltin-declaration-mismatch]
main.c:1:203: note: include '<math.h>' or provide a declaration of 'atan2'
main.c:1:267: error: implicit declaration of function 'cos' [-Wimplicit-function-declaration]
    1 | adouble x[100],y[100],t,u,s;n,i,j,k,c;main(m){for(;m=scanf("%d",&n),i=n;printf("%d\n",m)){for(;i--;scanf("%lf,%lf",x+i,y+i));for(i=n;j=--i;)for(;j--;)if(s=(u=acos(hypot(x[j]-x[i],y[j]-y[i])/2))<9)for(t=atan2(y[j]-y[i],x[j]-x[i]);c=0,s+3;s-=2)for(k=n;k--;)hypot(x[i]+cos(t+s*u)-x[k],y[i]+sin(t+s*u)-y[k])<1.1&&++c>m?m=c:0;}}
      |                                                                                                                                                                                                                                                                           ^~~
main.c:1:267: note: include '<math.h>' or provide a declaration of 'cos'
main.c:1:267: warning: incompatible implicit declaration of built-in function 'cos' [-Wbuiltin-declaration-mismatch]
main.c:1:267: note: include '<math.h>' or provide a declaration of 'cos'
main.c:1:288: error: implicit declaration of function 'sin' [-Wimplicit-function-declaration]
    1 | adouble x[100],y[100],t,u,s;n,i