Compilare: main.cpp: In function 'bool checkAxis(const P&, const P&)': main.cpp:189:17: warning: unused variable 'built' [-Wunused-variable] static bool built = [&]() { ^~~~~ main.cpp: In function 'int main()': main.cpp:225:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dmg.in", "r", stdin); ^ main.cpp:227:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("dmg.out", "w", stdout); ^