Compilare: main.cpp: In function 'void read()': main.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<strlen(linie); i++) ~^~~~~~~~~~~~~~ main.cpp:67:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<strlen(linie); i++) ~^~~~~~~~~~~~~~ main.cpp:92:29: warning: array subscript has type 'char' [-Wchar-subscripts] if(!nec[linie[i]] && linie[i]>0) ^ main.cpp:93:38: warning: array subscript has type 'char' [-Wchar-subscripts] nr_nec++,nec[linie[i]]=true; ^