foo.c: In function 'main':
foo.c:21:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[20]' [-Wformat=]
   scanf("%s %lld %lld %c %c %lld", &stu[i].name,&stu[i].score,&stu[i].cla,&stu[i].leader,&stu[i].west,&stu[i].paper);
          ~^                        ~~~~~~~~~~~~
foo.c:18:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld", &N);
  ^~~~~~~~~~~~~~~~~
foo.c:21:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s %lld %lld %c %c %lld", &stu[i].name,&stu[i].score,&stu[i].cla,&stu[i].leader,&stu[i].west,&stu[i].paper);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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