Compilare: user.cpp: In function ‘void intersc(NOD*&, NOD*&)’: user.cpp:19:10: warning: variable ‘p1u’ set but not used [-Wunused-but-set-variable] NOD* p1u; ^ user.cpp:22:10: warning: variable ‘p2a’ set but not used [-Wunused-but-set-variable] NOD* p2a; ^ user.cpp: In function ‘int main()’: user.cpp:52:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cerc5.in","r",stdin); ^ user.cpp:53:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cerc5.out","w",stdout); ^ user.cpp:58:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&p,&n,&k); ^ user.cpp:62:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^