Compilare: user.cpp: In function ‘long long int form(long long int)’: user.cpp:13:17: warning: unused variable ‘o’ [-Wunused-variable] int fr[10], o=0; ^ user.cpp: In function ‘int main()’: user.cpp:43:9: warning: unused variable ‘x’ [-Wunused-variable] int x; ^ user.cpp:40:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pluton.in", "r", stdin); ^ user.cpp:41:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pluton.out", "w", stdout); ^ user.cpp:42:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n); ^ user.cpp:46:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld\n", &a[i].nr); ^