Compilare: user.cpp: In function ‘int main()’: user.cpp:17:40: warning: operation on ‘nr’ may be undefined [-Wsequence-point] a[++nr] = a[nr - 1] + a[nr - 2]; ^ user.cpp:17:40: warning: operation on ‘nr’ may be undefined [-Wsequence-point] user.cpp:20:31: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long long int’ [-Wformat=] printf("%d ", a[i]); ^ user.cpp:36:27: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long long int’ [-Wformat=] printf("%d ", a[i]); ^ user.cpp:8:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lantaditiv.in", "r", stdin); ^ user.cpp:9:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lantaditiv.out", "w", stdout); ^ user.cpp:10:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &n); ^