Compilare: user.cpp: In function ‘int DFS(int, int)’: user.cpp:25:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < graph[nod].size() ; i++) ^ user.cpp: In function ‘int main()’: user.cpp:54:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < graph[i].size(); j++) ^ user.cpp:69:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < graph[i].size(); j++) ^