/in/foo.cc: In function 'bool check(int, int)':
/in/foo.cc:13:19: 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:56:6: error: redeclaration of 'int n'
  int n = 0, count = 0;
      ^
/in/foo.cc:32:6: note: 'int n' previously declared here
  int n = 9;
      ^
/in/foo.cc:79:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i<sen.size(); i++)
                  ~^~~~~~~~~~~
/in/foo.cc:100:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i<sen.size(); i++)
                  ~^~~~~~~~~~~