/in/foo.c: In function 'main':
/in/foo.c:13:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[20]' [-Wformat=]
 scanf("%s %d %d %c %c %d",&c1,&a,&b,&c,&d,&e);
         ^
/in/foo.c:9:25: warning: unused variable 'c3' [-Wunused-variable]
 char c1[20];char c2[20],c3[20];
                         ^~
/in/foo.c:38:1: warning: 'max' may be used uninitialized in this function [-Wmaybe-uninitialized]
 printf("%s\n%d\n%d\n",c2,f[max],s);
 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~