Compilare: user.cpp: In function ‘void eulerian_path(int, int)’: user.cpp:44:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[x].size(); ++i) ^ user.cpp: In function ‘void DFS(int)’: user.cpp:62:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[x].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:153:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < NV[x].size(); ++j) ^ user.cpp:161:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < NV[y].size(); ++j) ^