/in/foo.cc: In function 'bool check(int, int)':
/in/foo.cc:11:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<sen[p].size();i++)
              ~^~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:28:10: warning: unused variable 'count' [-Wunused-variable]
  int n=0,count=0;
          ^~~~~
/in/foo.cc:29:7: warning: variable 'symbol' set but not used [-Wunused-but-set-variable]
  char symbol='\0';
       ^~~~~~