Compilare: main.cpp: In function 'void read()': main.cpp:25:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<strlen(linie); i++) ~^~~~~~~~~~~~~~ main.cpp:51:29: warning: array subscript has type 'char' [-Wchar-subscripts] if(!nec[linie[i]]) ^ main.cpp:53:38: warning: array subscript has type 'char' [-Wchar-subscripts] nr_nec++,nec[linie[i]]=true; ^ main.cpp:56:33: warning: array subscript has type 'char' [-Wchar-subscripts] coeficienti[linie[i]]+=rezultat; ^