/in/foo.cc: In function 'void G(int, int, char)':
/in/foo.cc:169:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<cans.size();i++){
              ~^~~~~~~~~~~~
/in/foo.cc:174:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<mns.size();i++){
              ~^~~~~~~~~~~
/in/foo.cc:173:7: warning: unused variable 'flag' [-Wunused-variable]
  bool flag=0;
       ^~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:264:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(i=0;i<vpp[pii].size();i++){
           ~^~~~~~~~~~~~~~~~
/in/foo.cc:253:7: warning: unused variable 'NrE' [-Wunused-variable]
  bool NrE=0;
       ^~~
/in/foo.cc: In function 'void G(int, int, char)':
/in/foo.cc:185:7: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
  char s;
       ^
/in/foo.cc:185:7: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]