/in/foo.cc: In function 'bool cmp(std::__cxx11::string, std::__cxx11::string)':
/in/foo.cc:7:22: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  return t1<t2||t1==t2&&sa<sb;
                ~~~~~~^~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:23:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if(bg!=-1&&bg+x==s[j].size())
               ~~~~^~~~~~~~~~~~~
/in/foo.cc:11:15: warning: unused variable 'f' [-Wunused-variable]
  int n,q,x,bg,f;
               ^