Compilare: user.cpp: In function ‘int main()’: user.cpp:16:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("difprim.in", "r", stdin); ^ user.cpp:17:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("difprim.out", "w", stdout); ^ user.cpp:83:23: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout << x << " " << y << endl; ^ user.cpp:83:11: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout << x << " " << y << endl; ^