Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:26:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<muchii[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:120:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<ans.size();i++) ^ user.cpp:132:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<ans.size();i++) printf ("%d ",ans[i]); ^ user.cpp:80:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("johnie.in","r",stdin); ^ user.cpp:81:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("johnie.out","w",stdout); ^ user.cpp:86:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d",&n,&m); ^ user.cpp:88:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d",&x,&y); ^