Compilare: main.cpp: In function 'int main()': main.cpp:58:14: warning: variable 'ok' set but not used [-Wunused-but-set-variable] bool ok = false; ^~ main.cpp:38:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("bignumber.in", "r", stdin); ^ main.cpp:39:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("bignumber.out", "w", stdout); ^