Compilare: user.cpp: In function ‘long long int egcd(long long int, long long int, long long int&, long long int&)’: user.cpp:16:5: warning: statement has no effect [-Wunused-value] x == 1; ^ user.cpp:17:5: warning: statement has no effect [-Wunused-value] y == 0; ^ user.cpp: In function ‘int main()’: user.cpp:30:5: warning: unused variable ‘i’ [-Wunused-variable] ll i, j; ^ user.cpp:30:8: warning: unused variable ‘j’ [-Wunused-variable] ll i, j; ^ user.cpp:33:41: 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:35:43: 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); ^