Compilare: user.cpp: In function ‘int main()’: user.cpp:33:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zona.in","r",stdin); ^ user.cpp:34:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zona.out","w",stdout); ^ user.cpp:35:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&l,&c,&n,&pasi); ^ user.cpp:42:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^ user.cpp:37:14: warning: ‘w’ may be used uninitialized in this function [-Wmaybe-uninitialized] int cl,cc,q,w; ^ user.cpp:37:12: warning: ‘q’ may be used uninitialized in this function [-Wmaybe-uninitialized] int cl,cc,q,w; ^