Compilare: user.cpp: In function ‘void calc_nxt()’: user.cpp:19:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] nxt[i][str[i+1]] = i+1; } } ^ user.cpp: In function ‘void calc_nsd()’: user.cpp:25:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(nxt[i][str[i]] == n){ ^ user.cpp:28:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] sum = min(sum - nsd[nxt[i][str[i]]] + nsd[i], inf2); } } } ^