Compilare: user.cpp: In function ‘int main()’: user.cpp:9:23: warning: variable ‘A’ set but not used [-Wunused-but-set-variable] long long n,i,j,X,A,B,C; ^ user.cpp:9:25: warning: variable ‘B’ set but not used [-Wunused-but-set-variable] long long n,i,j,X,A,B,C; ^ user.cpp:9:27: warning: variable ‘C’ set but not used [-Wunused-but-set-variable] long long n,i,j,X,A,B,C; ^ user.cpp:7:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("expresie.in","r",stdin); ^ user.cpp:8:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("expresie.out","w",stdout); ^ user.cpp:11:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&n); ^ user.cpp:13:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&v[i]); ^