Compilare: user.cpp: In function ‘void dx(int)’: user.cpp:18:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<graf[ST.front()].size();i++) ^ user.cpp: In function ‘void dy(int)’: user.cpp:39:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<graf[ST.front()].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:56:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("graf.in","r",stdin); ^ user.cpp:57:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("graf.out","w",stdout); ^ user.cpp:59:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n,&m,&X,&Y); ^ user.cpp:62:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^