/in/foo.cc: In function 'int main()':
/in/foo.cc:7:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.size();i++){
              ~^~~~~~~~~
/in/foo.cc:6:6: warning: unused variable 'ans' [-Wunused-variable]
  int ans,d;
      ^~~
/in/foo.cc:11:9: warning: 'd' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if(d==1||d==2)cout<<1;
     ~~~~^~~~~~