/in/foo.cc: In function 'int main()':
/in/foo.cc:21:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int i = 4;i < c.size() - 1;i++){
                           ~~^~~~~~~~~~~~~~
/in/foo.cc:41:22: warning: variable 'nst' set but not used [-Wunused-but-set-variable]
                 bool nst,ned;
                      ^~~
/in/foo.cc:41:26: warning: variable 'ned' set but not used [-Wunused-but-set-variable]
                 bool nst,ned;
                          ^~~