foo.cc: In function 'int main()':
foo.cc:50:33: warning: array subscript has type 'char' [-Wchar-subscripts]
   50 |             int AS = AC[S1[i - 1]][S] + AC[S2[i - 1]][S];
      |                         ~~~~~~~~^
foo.cc:50:52: warning: array subscript has type 'char' [-Wchar-subscripts]
   50 |             int AS = AC[S1[i - 1]][S] + AC[S2[i - 1]][S];
      |                                            ~~~~~~~~^
foo.cc:51:33: warning: array subscript has type 'char' [-Wchar-subscripts]
   51 |             int DS = DC[S1[i - 1]][S] + DC[S2[i - 1]][S];
      |                         ~~~~~~~~^
foo.cc:51:52: warning: array subscript has type 'char' [-Wchar-subscripts]
   51 |             int DS = DC[S1[i - 1]][S] + DC[S2[i - 1]][S];
      |                                            ~~~~~~~~^

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