Compilare: user.cpp: In function ‘char _find(char, char)’: user.cpp:15:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] return mat[a][b]; ^ user.cpp:15:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] return mat[a][b]; ^ user.cpp: In function ‘int main()’: user.cpp:46:10: warning: array subscript has type ‘char’ [-Wchar-subscripts] mat[a][b]=c; ^ user.cpp:46:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] mat[a][b]=c; ^ user.cpp:47:10: warning: array subscript has type ‘char’ [-Wchar-subscripts] mat[b][a]=c; ^ user.cpp:47:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] mat[b][a]=c; ^ user.cpp:48:10: warning: array subscript has type ‘char’ [-Wchar-subscripts] mat[a][c]=b; ^ user.cpp:48:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] mat[a][c]=b; ^ user.cpp:49:10: warning: array subscript has type ‘char’ [-Wchar-subscripts] mat[c][a]=b; ^ user.cpp:49:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] mat[c][a]=b; ^ user.cpp:50:10: warning: array subscript has type ‘char’ [-Wchar-subscripts] mat[b][c]=a; ^ user.cpp:50:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] mat[b][c]=a; ^ user.cpp:51:10: warning: array subscript has type ‘char’ [-Wchar-subscripts] mat[c][b]=a; ^ user.cpp:51:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] mat[c][b]=a; ^