Compilare: user.cpp: In function ‘int dist(int, int, char, char)’: user.cpp:226:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] res += A[a][S[l+1]] + A[S[r-1]][b]; ^ user.cpp:226:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] res += A[a][S[l+1]] + A[S[r-1]][b]; ^ user.cpp:226:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] res += A[a][S[l+1]] + A[S[r-1]][b]; ^ user.cpp:226:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] res += A[a][S[l+1]] + A[S[r-1]][b]; ^ user.cpp:228:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] res = A[a][b]; ^ user.cpp:228:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] res = A[a][b]; ^ user.cpp: In function ‘std::pair<std::pair<int, int>, std::pair<int, int> > solve()’: user.cpp:145:46: warning: unused variable ‘_NN’ [-Wunused-variable] #define re(II, NN) for (int II(0), _NN(NN); (II) < (NN); ++(II)) ^ user.cpp:269:17: note: in expansion of macro ‘re’ re (i, 2) re (j, 2) { ^ user.cpp:145:46: warning: unused variable ‘_NN’ [-Wunused-variable] #define re(II, NN) for (int II(0), _NN(NN); (II) < (NN); ++(II)) ^ user.cpp:269:7: note: in expansion of macro ‘re’ re (i, 2) re (j, 2) { ^ user.cpp:145:46: warning: unused variable ‘_NN’ [-Wunused-variable] #define re(II, NN) for (int II(0), _NN(NN); (II) < (NN); ++(II)) ^ user.cpp:291:15: note: in expansion of macro ‘re’ re (i, 2) re (j, 2) ^ user.cpp:145:46: warning: unused variable ‘_NN’ [-Wunused-variable] #define re(II, NN) for (int II(0), _NN(NN); (II) < (NN); ++(II)) ^ user.cpp:291:5: note: in expansion of macro ‘re’ re (i, 2) re (j, 2) ^ user.cpp:145:46: warning: unused variable ‘_NN’ [-Wunused-variable] #define re(II, NN) for (int II(0), _NN(NN); (II) < (NN); ++(II)) ^ user.cpp:308:15: note: in expansion of macro ‘re’ re (i, 2) re (j, 2) { ^