/in/foo.cc: In function 'int main()':
/in/foo.cc:8:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.size();i++){
              ~^~~~~~~~~
/in/foo.cc:9:10: warning: array subscript has type 'char' [-Wchar-subscripts]
   id[s[i]]=i;
          ^
/in/foo.cc:13:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=1;i<s.size();i++){
              ~^~~~~~~~~
/in/foo.cc:14:13: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(id[s[i]]<=id[s[i-1]]) Ans++;
             ^
/in/foo.cc:14:25: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(id[s[i]]<=id[s[i-1]]) Ans++;
                         ^