Language: C

i,j,k,c,N;main(){scanf("%d",&N);for(;i<N;i++,k=c==N-1?i:k)for(c=j=0;j<=N;j++)c+=getchar()=='o'?1:0;for(i=1000;i--;)printf("%d\n",k?k:rand()%N+1);}

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | i,j,k,c,N;main(){scanf("%d",&N);for(;i<N;i++,k=c==N-1?i:k)for(c=j=0;j<=N;j++)c+=getchar()=='o'?1:0;for(i=1000;i--;)printf("%d\n",k?k:rand()%N+1);}
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'i' [-Wimplicit-int]
main.c:1:3: error: type defaults to 'int' in declaration of 'j' [-Wimplicit-int]
    1 | i,j,k,c,N;main(){scanf("%d",&N);for(;i<N;i++,k=c==N-1?i:k)for(c=j=0;j<=N;j++)c+=getchar()=='o'?1:0;for(i=1000;i--;)printf("%d\n",k?k:rand()%N+1);}
      |   ^
main.c:1:5: error: type defaults to 'int' in declaration of 'k' [-Wimplicit-int]
    1 | i,j,k,c,N;main(){scanf("%d",&N);for(;i<N;i++,k=c==N-1?i:k)for(c=j=0;j<=N;j++)c+=getchar()=='o'?1:0;for(i=1000;i--;)printf("%d\n",k?k:rand()%N+1);}
      |     ^
main.c:1:7: error: type defaults to 'int' in declaration of 'c' [-Wimplicit-int]
    1 | i,j,k,c,N;main(){scanf("%d",&N);for(;i<N;i++,k=c==N-1?i:k)for(c=j=0;j<=N;j++)c+=getchar()=='o'?1:0;for(i=1000;i--;)printf("%d\n",k?k:rand()%N+1);}
      |       ^
main.c:1:9: error: type defaults to 'int' in declaration of 'N' [-Wimplicit-int]
    1 | i,j,k,c,N;main(){scanf("%d",&N);for(;i<N;i++,k=c==N-1?i:k)for(c=j=0;j<=N;j++)c+=getchar()=='o'?1:0;for(i=1000;i--;)printf("%d\n",k?k:rand()%N+1);}
      |         ^
main.c:1:11: error: return type defaults to 'int' [-Wimplicit-int]
    1 | i,j,k,c,N;main(){scanf("%d",&N);for(;i<N;i++,k=c==N-1?i:k)for(c=j=0;j<=N;j++)c+=getchar()=='o'?1:0;for(i=1000;i--;)printf("%d\n",k?k:rand()%N+1);}
      |           ^~~~
main.c: In function 'main':
main.c:1:18: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    1 | i,j,k,c,N;main(){scanf("%d",&N);for(;i<N;i++,k=c==N-1?i:k)for(c=j=0;j<=N;j++)c+=getchar()=='o'?1:0;for(i=1000;i--;)printf("%d\n",k?k:rand()%N+1);}
      |                  ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | i,j,k,c,N;main(){scanf("%d",&N);for(;i<N;i++,k=c==N-1?i:k)for(c=j=0;j<=N;j++)c+=getchar()=='o'?1:0;for(i=1000;i--;)printf("%d\n",k?k:rand()%N+1);}
main.c:1:18: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    1 | i,j,k,c,N;main(){scanf("%d",&N);for(;i<N;i++,k=c==N-1?i:k)for(c=j=0;j<=N;j++)c+=getchar()=='o'?1:0;for(i=1000;i--;)printf("%d\n",k?k:rand()%N+1);}
      |                  ^~~~~
main.c:1:18: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:1:81: error: implicit declaration of function 'getchar' [-Wimplicit-function-declaration]
    1 | i,j,k,c,N;main(){scanf("%d",&N);for(;i<N;i++,k=c==N-1?i:k)for(c=j=0;j<=N;j++)c+=getchar()=='o'?1:0;for(i=1000;i--;)printf("%d\n",k?k:rand()%N+1);}
      |                                                                                 ^~~~~~~
main.c:1:81: note: 'getchar' is defined in header '<stdio.h>'; this is probably fixable by adding '#include <stdio.h>'
main.c:1:116: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    1 | i,j,k,c,N;main(){scanf("%d",&N);for(;i<N;i++,k=c==N-1?i:k)for(c=j=0;j<=N;j++)c+=getchar()=='o'?1:0;for(i=1000;i--;)printf("%d\n",k?k:rand()%N+1);}
      |                                                                                                                    ^~~~~~
main.c:1:116: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:116: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:1:116: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:1:134: error: implicit declaration of function 'rand' [-Wimplicit-function-declaration]
    1 | i,j,k,c,N;main(){scanf("%d",&N);for(;i<N;i++,k=c==N-1?i:k)for(c=j=0;j<=N;j++)c+=getchar()=='o'?1:0;for(i=1000;i--;)printf("%d\n",k?k:rand()%N+1);}
      |                                                                                                                                      ^~~~