/in/foo.cc:6:14: warning: missing terminating ' character
  a[0] = a[n1]'-1;
              ^
/in/foo.cc:6:14: error: missing terminating ' character
  a[0] = a[n1]'-1;
              ^~~~
/in/foo.cc: In function 'void right()':
/in/foo.cc:7:2: error: expected ';' before 'for'
  for(int i = 1; i <= n1; i++){
  ^~~
/in/foo.cc:7:17: error: 'i' was not declared in this scope
  for(int i = 1; i <= n1; i++){
                 ^