Compilare: user.cpp: In function ‘int main()’: user.cpp:20:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] frec[ch] = nr; ^ user.cpp:35:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] sum = sum + frec[sir[i]]; ^ user.cpp:45:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(lungime >= frec[sir[i]] && i < n) ^ user.cpp:48:44: warning: array subscript has type ‘char’ [-Wchar-subscripts] lungime = lungime - frec[sir[i]]; ^ user.cpp:31:10: warning: unused variable ‘ok’ [-Wunused-variable] bool ok = true; ^