foo.cc: In function 'int main()':
foo.cc:17:36: warning: array subscript has type 'char' [-Wchar-subscripts]
   17 |                         s[i]=s1[s[i]]-32;
      |                                 ~~~^
foo.cc:22:36: warning: array subscript has type 'char' [-Wchar-subscripts]
   22 |                         s[i]=s1[s[i]];
      |                                 ~~~^

[Hydro](https://hydro.ac)提供评测服务