/in/foo.cc:17:29: error: empty character constant
   17 |                 cout<<a[i]<<'';
      |                             ^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:12:9: error: expected '(' before '{' token
   12 |         {
      |         ^
      |         (
/in/foo.cc:12:9: error: expected primary-expression before '{' token
/in/foo.cc:11:14: error: expected ')' before '{' token
   11 |         while
      |              ^
      |              )
   12 |         {
      |         ~     
/in/foo.cc:14:25: error: expected ')' before ';' token
   14 |                 sort(a+1;a+1+r);
      |                     ~   ^
      |                         )
/in/foo.cc:14:31: error: expected ';' before ')' token
   14 |                 sort(a+1;a+1+r);
      |                               ^
      |                               ;
/in/foo.cc:14:29: warning: statement has no effect [-Wunused-value]
   14 |                 sort(a+1;a+1+r);
      |                          ~~~^~