Compilare: user.cpp: In function ‘int main()’: user.cpp:12:13: warning: unused variable ‘nr’ [-Wunused-variable] int i,j,nr; ^ user.cpp:13:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("oras.in","r",stdin); ^ user.cpp:14:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("oras.out","w",stdout); ^ user.cpp:15:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:16:13: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(n==2 || i==4) ^