Compilare: user.cpp: In function ‘bool EdgeOK(int, int)’: user.cpp:117:36: warning: unused variable ‘ok’ [-Wunused-variable] bool A = false, B = false, ok = true; ^ user.cpp: In function ‘int main()’: user.cpp:134:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("robot.in", "r", stdin); ^ user.cpp:135:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("robot.out", "w", stdout); ^ user.cpp:136:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("robot.err", "w", stderr); ^