Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:21:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < graph[node].size(); ++ i) ^ user.cpp:54:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < graph[node].size(); ++ i) { ^ user.cpp:31:36: warning: ‘pos_father’ may be used uninitialized in this function [-Wmaybe-uninitialized] swap(graph[node][pos_father], graph[node].back()); ^