Compilare: user.cpp: In function ‘int main()’: user.cpp:5:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sao.in","r",stdin) ;freopen("sao.out","w",stdout) ; ^ user.cpp:5:64: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sao.in","r",stdin) ;freopen("sao.out","w",stdout) ; ^ user.cpp:6:67: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int n ,k ,hp ,a ;register int i ;scanf("%d%d%d" ,&n ,&k ,&hp) ; ^ user.cpp:8:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a) ,pq.push(a) ;hp -= a ; ^