Compilare: user.cpp: In function ‘void incl_excl()’: user.cpp:76:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int bit = 0; bit < a.size(); ++ bit) ^ user.cpp: In function ‘bool inter(para, int, int, int)’: user.cpp:53:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:137:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zuzu.in","r",stdin); ^ user.cpp:138:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zuzu.out","w",stdout); ^ user.cpp:140:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&N,&T); ^ user.cpp:145:78: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf%lf%lf%lf%lf",&vi.Ax,&vi.Ay,&vi.Az,&vi.Bx,&vi.By,&vi.Bz); ^ user.cpp:146:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&vi.dir); ^