Compilare: user.cpp: In function ‘void di()’: user.cpp:26:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[x].size();i++) ^ user.cpp:15:9: warning: unused variable ‘es’ [-Wunused-variable] int es=0; ^ user.cpp: In function ‘void df(int, int&)’: user.cpp:55:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[st].size();i++) ^