Compilare: user.cpp: In function ‘long long int exp(long long int, long long int)’: user.cpp:15:15: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if (b & 1 == 1) ^ user.cpp: In function ‘int main()’: user.cpp:28:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cabana.in", "r", stdin); ^ user.cpp:29:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cabana.out", "w", stdout); ^