/in/foo.cc: In function 'int main()':
/in/foo.cc:24:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<n.size();i++)
               ~^~~~~~~~~
/in/foo.cc:25:8: warning: 'T' may be used uninitialized in this function [-Wmaybe-uninitialized]
      mo=(mo*10+(n[i]-'0'))%T;
      ~~^~~~~~~~~~~~~~~~~~~~~