Compilare: user.cpp: In function ‘int main()’: user.cpp:19:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("grupuri.in","r",stdin); ^ user.cpp:20:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("grupuri.out","w",stdout); ^ user.cpp:21:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&k,&n); ^ user.cpp:23:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]),s+=v[i]; ^ user.cpp: In function ‘int gr(int)’: user.cpp:13:5: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (nr>=m*k) ^ user.cpp: In function ‘int main()’: user.cpp:13:5: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:10:11: note: ‘nr’ was declared here int i,nr; ^