Compilare: user.cpp: In function ‘int main()’: user.cpp:32:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("pluton.in", "r", stdin); ^ user.cpp:33:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("pluton.out", "w", stdout); ^ user.cpp:35:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int nrp = 0; scanf ("%d",&n); ^ user.cpp:37:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &ar[i]); ^ user.cpp:64:37: warning: ‘Q’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (i=1;i<=n;i++) if (equal(Q,ar[i]) && ar[i]) printf ("%d ", ar[i]); ^