Language: C

m=-1,t[];main(){for(gets(t);gets(t);strcmp(t,&m)<0&&strcpy(m,t));*m=!puts(&m);}

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | m=-1,t[];main(){for(gets(t);gets(t);strcmp(t,&m)<0&&strcpy(m,t));*m=!puts(&m);}
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'm' [-Wimplicit-int]
main.c:1:6: error: type defaults to 'int' in declaration of 't' [-Wimplicit-int]
    1 | m=-1,t[];main(){for(gets(t);gets(t);strcmp(t,&m)<0&&strcpy(m,t));*m=!puts(&m);}
      |      ^
main.c:1:10: error: return type defaults to 'int' [-Wimplicit-int]
    1 | m=-1,t[];main(){for(gets(t);gets(t);strcmp(t,&m)<0&&strcpy(m,t));*m=!puts(&m);}
      |          ^~~~
main.c: In function 'main':
main.c:1:21: error: implicit declaration of function 'gets' [-Wimplicit-function-declaration]
    1 | m=-1,t[];main(){for(gets(t);gets(t);strcmp(t,&m)<0&&strcpy(m,t));*m=!puts(&m);}
      |                     ^~~~
main.c:1:37: error: implicit declaration of function 'strcmp' [-Wimplicit-function-declaration]
    1 | m=-1,t[];main(){for(gets(t);gets(t);strcmp(t,&m)<0&&strcpy(m,t));*m=!puts(&m);}
      |                                     ^~~~~~
main.c:1:1: note: include '<string.h>' or provide a declaration of 'strcmp'
  +++ |+#include <string.h>
    1 | m=-1,t[];main(){for(gets(t);gets(t);strcmp(t,&m)<0&&strcpy(m,t));*m=!puts(&m);}
main.c:1:44: error: passing argument 1 of 'strcmp' from incompatible pointer type [-Wincompatible-pointer-types]
    1 | m=-1,t[];main(){for(gets(t);gets(t);strcmp(t,&m)<0&&strcpy(m,t));*m=!puts(&m);}
      |                                            ^
      |                                            |
      |                                            int *
main.c:1:44: note: expected 'const char *' but argument is of type 'int *'
main.c:1:46: error: passing argument 2 of 'strcmp' from incompatible pointer type [-Wincompatible-pointer-types]
    1 | m=-1,t[];main(){for(gets(t);gets(t);strcmp(t,&m)<0&&strcpy(m,t));*m=!puts(&m);}
      |                                              ^~
      |                                              |
      |                                              int *
main.c:1:46: note: expected 'const char *' but argument is of type 'int *'
main.c:1:53: error: implicit declaration of function 'strcpy' [-Wimplicit-function-declaration]
    1 | m=-1,t[];main(){for(gets(t);gets(t);strcmp(t,&m)<0&&strcpy(m,t));*m=!puts(&m);}
      |                                                     ^~~~~~
main.c:1:53: note: include '<string.h>' or provide a declaration of 'strcpy'
main.c:1:53: warning: incompatible implicit declaration of built-in function 'strcpy' [-Wbuiltin-declaration-mismatch]
main.c:1:53: note: include '<string.h>' or provide a declaration of 'strcpy'
main.c:1:60: error: passing argument 1 of 'strcpy' makes pointer from integer without a cast [-Wint-conversion]
    1 | m=-1,t[];main(){for(gets(t);gets(t);strcmp(t,&m)<0&&strcpy(m,t));*m=!puts(&m);}
      |                                                            ^
      |                                                            |
      |                                                            int
main.c:1:60: note: expected 'char *' but argument is of type 'int'
main.c:1:62: error: passing argument 2 of 'strcpy' from incompatible pointer type [-Wincompatible-pointer-types]
    1 | m=-1,t[];main(){for(gets(t);gets(t);strcmp(t,&m)<0&&strcpy(m,t));*m=!puts(&m);}
      |                                                              ^
      |                                                              |
      |                                                              int *
main.c:1:62: note: expected 'const char *' but argument is of type 'int *'
main.c:1:66: error: invalid type argument of unary '*' (have 'int')
    1 | m=-1,t[];main(){for(gets(t);gets(t);strcmp(t,&m)<0&&strcpy(m,t));*m=!puts(&m);}
      |                                                                  ^~
main.c:1:70: error: implicit declaration of function 'puts' [-Wimplicit-function-declaration]
    1 | m=-1,t[];main(){for(gets(t);gets(t);strcmp(t,&m)<0&&strcpy(m,t));*m=!puts(&m);}
      |                                                                      ^~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'puts'
  +++ |+#include <stdio.h>
    1 | m=-1,t[];main(){for(gets(t);gets(t);strcmp(t,&m)<0&&strcpy(m,t));*m=!puts(&m);}
main.c:1:75: error: passing argument 1 of 'puts' from incompatible pointer type [-Wincompatible-pointer-types]
    1 | m=-1,t[];main(){for(gets(t);gets(t);strcmp(t,&m)<0&&strcpy(m,t));*m=!puts(&m);}
      |                                                                           ^~
      |                                                                           |
      |                                                                           int *
main.c:1:75: note: expected 'const char *' but argument is of type 'int *'
main.c: At top level:
main.c:1:6: warning: array 't' assumed to have one element
    1 | m=-1,t[];main(){for(gets(t);gets(t);strcmp(t,&m)<0&&strcpy(m,t));*m=!puts(&m);}
      |      ^