foo.cc: In member function 'bool Node::operator<(const Node&)':
foo.cc:11:12: error: request for member 'All' in '(Node*)this', which is of pointer type 'Node*' (maybe you meant to use '->' ?)
   if (this.All != b.All)
            ^~~
foo.cc:12:16: error: request for member 'All' in '(Node*)this', which is of pointer type 'Node*' (maybe you meant to use '->' ?)
    return this.All > b.all;
                ^~~
foo.cc:12:24: error: 'const struct Node' has no member named 'all'; did you mean 'All'?
    return this.All > b.all;
                        ^~~
                        All
foo.cc:13:12: error: request for member 'Chinese' in '(Node*)this', which is of pointer type 'Node*' (maybe you meant to use '->' ?)
   if (this.Chinese != b.Chinese)
            ^~~~~~~
foo.cc:14:16: error: request for member 'Chinese' in '(Node*)this', which is of pointer type 'Node*' (maybe you meant to use '->' ?)
    return this.Chinese > b.Chinese;
                ^~~~~~~
foo.cc:15:15: error: request for member 'id' in '(Node*)this', which is of pointer type 'Node*' (maybe you meant to use '->' ?)
   return this.id < b.id;
               ^~
foo.cc: In function 'int main()':
foo.cc:23:55: warning: too many arguments for format [-Wformat-extra-args]
   scanf("%d", &a[i].Chinese, &a[i].Math, &a[i].English);
                                                       ^
foo.cc:27:2: error: 'sort' was not declared in this scope
  sort(a + 1, a + n + 1);
  ^~~~
foo.cc:27:2: note: suggested alternative:
In file included from /usr/include/c++/7/algorithm:62:0,
                 from foo.cc:4:
/usr/include/c++/7/bits/stl_algo.h:4856:5: note:   'std::sort'
     sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
     ^~~~
foo.cc:21:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
foo.cc:23:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &a[i].Chinese, &a[i].Math, &a[i].English);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

自豪的采用 HydroJudger 进行评测(github.com/hydro-dev/HydroJudger)