Compilare: user.cpp: In function ‘int main()’: user.cpp:77:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i< v[0].v.size(); i++) ^ user.cpp:94:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[arc].v.size(); i++) ^ user.cpp:113:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i< v2[n+1].v.size(); i++) ^ user.cpp:128:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v2[arc].v.size(); i++) ^