/in/foo.cc: In function 'int main()':
/in/foo.cc:12:12: warning: array subscript has type 'char' [-Wchar-subscripts]
  if(mp[s[i]]>=mp[c[i]])ans[i]=s[i]-mp[c[i]];else ans[i]=s[i]-mp[c[i]]+26;
            ^
/in/foo.cc:12:22: warning: array subscript has type 'char' [-Wchar-subscripts]
  if(mp[s[i]]>=mp[c[i]])ans[i]=s[i]-mp[c[i]];else ans[i]=s[i]-mp[c[i]]+26;
                      ^
/in/foo.cc:12:43: warning: array subscript has type 'char' [-Wchar-subscripts]
  if(mp[s[i]]>=mp[c[i]])ans[i]=s[i]-mp[c[i]];else ans[i]=s[i]-mp[c[i]]+26;
                                           ^
/in/foo.cc:12:69: warning: array subscript has type 'char' [-Wchar-subscripts]
  if(mp[s[i]]>=mp[c[i]])ans[i]=s[i]-mp[c[i]];else ans[i]=s[i]-mp[c[i]]+26;
                                                                     ^