/in/foo.cc: In function 'int main()':
/in/foo.cc:10:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(i<s.size())
        ~^~~~~~~~~
/in/foo.cc:13:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(s[tmp]==t[j]&&j<t.size()&&tmp<s.size()) 
                       ~^~~~~~~~~
/in/foo.cc:13:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(s[tmp]==t[j]&&j<t.size()&&tmp<s.size()) 
                                   ~~~^~~~~~~~~
/in/foo.cc:16:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(j==t.size()) 
      ~^~~~~~~~~~