/in/foo.cc: In function 'int main()':
/in/foo.cc:22:18: error: expected primary-expression before ')' token
   if(coins==left)){
                  ^
/in/foo.cc:28:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0;i<coins.size();i++){
                ~^~~~~~~~~~~~~
/in/foo.cc:13:6: warning: unused variable 'circle' [-Wunused-variable]
  int circle = 0;
      ^~~~~~