View Compilation Error

0_0_38938697_13858.cpp:8:6: error: 'Q' was not declared in this scope
    8 | }stu[Q];
      |      ^
0_0_38938697_13858.cpp: In function 'int main()':
0_0_38938697_13858.cpp:23:25: error: 'stu' was not declared in this scope; did you mean 'std'?
   23 |                         stu[p].id = i;
      |                         ^~~
      |                         std
0_0_38938697_13858.cpp:28:14: error: 'stu' was not declared in this scope; did you mean 'std'?
   28 |         sort(stu,stu+p,cmp);
      |              ^~~
      |              std