/in/foo.cc: In function 'int main()':
/in/foo.cc:40:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<v.size()&&v[i]<=x;i++)
               ~^~~~~~~~~
/in/foo.cc:49:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(i=0;i<v.size()&&v[i]<x;i++);
           ~^~~~~~~~~