foo.cc: In function ‘int main()’:
foo.cc:63:16: error: return-statement with no value, in function returning ‘int’ [-fpermissive]
   63 |     cout << 6; return;
      |                ^~~~~~
foo.cc: In function ‘int search(int&, int&)’:
foo.cc:25:1: warning: control reaches end of non-void function [-Wreturn-type]
   25 | }
      | ^