Compilare: user.cpp: In function ‘int main()’: user.cpp:13:6: warning: unused variable ‘d’ [-Wunused-variable] int d = 2; ^ user.cpp:14:6: warning: unused variable ‘cn’ [-Wunused-variable] int cn = n - 1; ^ user.cpp:10:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("inversmodular.in", "r", stdin); ^ user.cpp:11:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("inversmodular.out", "w", stdout); ^ user.cpp:12:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &a, &n); ^