Compilare: user.cpp: In function ‘bool Ok(int)’: user.cpp:15:20: warning: unused variable ‘k’ [-Wunused-variable] int i,j,best = oo,k,p,x; ^ user.cpp:15:22: warning: unused variable ‘p’ [-Wunused-variable] int i,j,best = oo,k,p,x; ^ user.cpp: In function ‘int main()’: user.cpp:62:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("stalpi2.in","r",stdin); ^ user.cpp:63:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("stalpi2.out","w",stdout); ^ user.cpp:64:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&N,&emax); ^ user.cpp:67:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ",&a[i]); ^