Compilare: user.cpp: In function ‘long long int pd(int, int)’: user.cpp:14:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] return c[a[i]][a[j]]; ^ user.cpp:14:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] return c[a[i]][a[j]]; ^ user.cpp:24:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] c[a[i]][a[i + 1]] + pd(i + 2, j), ^ user.cpp:24:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] c[a[i]][a[i + 1]] + pd(i + 2, j), ^ user.cpp:26:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] c[a[j - 1]][a[j]] + pd(i, j - 2), ^ user.cpp:26:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] c[a[j - 1]][a[j]] + pd(i, j - 2), ^ user.cpp:27:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] pd(i + 1, j - 1) + c[a[i]][a[j]] ^ user.cpp:27:44: warning: array subscript has type ‘char’ [-Wchar-subscripts] pd(i + 1, j - 1) + c[a[i]][a[j]] ^ user.cpp: In function ‘int main()’: user.cpp:43:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] in >> c[c1][c2]; ^ user.cpp:43:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] in >> c[c1][c2]; ^