Compilare: user.cpp: In function ‘void lv(int)’: user.cpp:11:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<va[x].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:38:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<g[cv].size();i++){ ^ user.cpp:50:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<va[al].size();i++){ ^