foo.cc: In function 'int main()':
foo.cc:19:33: warning: array subscript has type 'char' [-Wchar-subscripts]
   19 |                         f[i][c[i]] = min(f[i - 1][j] + 2,f[i][c[i]]);
      |                              ~~~^
foo.cc:19:66: warning: array subscript has type 'char' [-Wchar-subscripts]
   19 |                         f[i][c[i]] = min(f[i - 1][j] + 2,f[i][c[i]]);
      |                                                               ~~~^
foo.cc:20:33: warning: array subscript has type 'char' [-Wchar-subscripts]
   20 |                         f[i][c[i]] = min(f[i - 1][c[i]] + 1,f[i][c[i]]);
      |                              ~~~^
foo.cc:20:54: warning: array subscript has type 'char' [-Wchar-subscripts]
   20 |                         f[i][c[i]] = min(f[i - 1][c[i]] + 1,f[i][c[i]]);
      |                                                   ~~~^
foo.cc:20:69: warning: array subscript has type 'char' [-Wchar-subscripts]
   20 |                         f[i][c[i]] = min(f[i - 1][c[i]] + 1,f[i][c[i]]);
      |                                                                  ~~~^

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