/in/foo.cc: In function 'int main()':
/in/foo.cc:10:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<a.size();i++){
              ~^~~~~~~~~
/in/foo.cc:11:13: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(to[a[i]]==0){
             ^
/in/foo.cc:12:11: warning: array subscript has type 'char' [-Wchar-subscripts]
    to[a[i]]=b[i];
           ^
/in/foo.cc:15:14: warning: array subscript has type 'char' [-Wchar-subscripts]
    if(to[a[i]]!=b[i]){
              ^
/in/foo.cc:23:10: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(to[i]==0){
          ^
/in/foo.cc:29:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<c.size();i++){
              ~^~~~~~~~~
/in/foo.cc:30:13: warning: array subscript has type 'char' [-Wchar-subscripts]
   if(to[c[i]]!=0){
             ^
/in/foo.cc:31:16: warning: array subscript has type 'char' [-Wchar-subscripts]
    Ans+=to[c[i]];
                ^