Run id: 161149

Main.cc: In function 'int main()':
Main.cc:16:11: error: 'a' was not declared in this scope
      cin>>a[i].id>>a[i].name>>a[i].sl>>a[i].zj;
           ^
Main.cc:18:10: error: 'a' was not declared in this scope
     sort(a,a+n,cmp);
          ^