/in/foo.cc: In function 'void findsame(std::__cxx11::string, std::__cxx11::string, std::__cxx11::string, int&)':
/in/foo.cc:36:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<k;i++)
                     ~^~
/in/foo.cc:40:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<t.size();i++)
                     ~^~~~~~~~~
/in/foo.cc:50:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<txt.size();i++)
                     ~^~~~~~~~~~~
/in/foo.cc: In function 'void print(std::vector<char>)':
/in/foo.cc:60:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<res.size();i++)
                 ~^~~~~~~~~~~