Compilare: user.cpp: In function ‘void Read()’: user.cpp:22:46: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(int i=0;i<m;i++) X[i]-='0',frecv[X[i]]++; ^ user.cpp: In function ‘int Cif_fix(long long int&, int, int)’: user.cpp:62:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] frecv[X[c]]--; ^ user.cpp:64:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] frecv[X[c]]++; ^ user.cpp: In function ‘void Solve()’: user.cpp:83:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] frecv[X[c]]--; ^