Compilare: user.cpp: In function ‘int main()’: user.cpp:9:12: warning: unused variable ‘nr’ [-Wunused-variable] int n, nr = 0; ^~ user.cpp:10:15: warning: unused variable ‘u’ [-Wunused-variable] long long u = 1, ua; ^ user.cpp:10:22: warning: unused variable ‘ua’ [-Wunused-variable] long long u = 1, ua; ^~ user.cpp:7:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("valoare.in", "r", stdin); ^ user.cpp:8:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("valoare.out", "w", stdout); ^ user.cpp:11:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:13:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); } ^