View Compilation Error

0_0_38975904_28209.cpp:68:1: error: 'oid' does not name a type; did you mean 'void'?
   68 | oid del(register int x){
      | ^~~
      | void
0_0_38975904_28209.cpp: In function 'int main()':
0_0_38975904_28209.cpp:103:19: error: 'del' was not declared in this scope
  103 |         while(l<x)del(l++);
      |                   ^~~
0_0_38975904_28209.cpp:106:19: error: 'del' was not declared in this scope
  106 |         while(r>y)del(r--);
      |                   ^~~