foo.c: In function 'main':
foo.c:19:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[30]' [-Wformat=]
   scanf("%s %d %d %c %c %d",&st[i].name,&st[i].score1,&st[i].score2,&st[i].y1,&st[i].y2,&st[i].num);
          ~^                 ~~~~~~~~~~~
foo.c:14:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ^~~~~~~~~~~~~~
foo.c:19:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s %d %d %c %c %d",&st[i].name,&st[i].score1,&st[i].score2,&st[i].y1,&st[i].y2,&st[i].num);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c:16:6: warning: 'who' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int who;
      ^~~