Compilare: user.cpp: In function ‘void afis(std::vector<int>)’: user.cpp:41:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v.size(); i++) { ^ user.cpp: In function ‘void afisgraf()’: user.cpp:49:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<G[i].size(); j++) { ^ user.cpp: In function ‘std::vector<int> bellman(int)’: user.cpp:68:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[source].size(); i++) { ^ user.cpp:78:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[top].size(); i++) { ^