Compilare: user.cpp: In function ‘int main()’: user.cpp:60:48: warning: integer overflow in expression [-Woverflow] _min = min[ins] ? min[ins] : (1 << 31) - 1; ^ user.cpp:39:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zebughil.in", "r", stdin); ^ user.cpp:40:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zebughil.out", "w", stdout); ^