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:21:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] long long min = c[a[i]][a[j]] + pd(i + 1, j - 1); ^ user.cpp:21:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] long long min = c[a[i]][a[j]] + pd(i + 1, j - 1); ^ user.cpp: In function ‘int main()’: user.cpp:40:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] in >> c[c1][c2]; ^ user.cpp:40:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] in >> c[c1][c2]; ^