Compilare: user.cpp: In function ‘int main()’: user.cpp:74:12: warning: unused variable ‘tic’ [-Wunused-variable] time_t tic = clock(); ^ user.cpp:78:12: warning: unused variable ‘toc’ [-Wunused-variable] time_t toc = clock(); ^ user.cpp:71:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("infinitywar.in", "rt", stdin); ^ user.cpp:72:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("infinitywar.out", "wt", stdout); ^