Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:17:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<V[nod].size();i++) ^ user.cpp:29:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (st.size()>k) ^ user.cpp: In function ‘int main()’: user.cpp:62:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<rez[i].size();j++) ^ user.cpp:46:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("biconex.in","r",stdin); ^ user.cpp:47:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:51:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^