Compilare: user.cpp: In function ‘int main()’: user.cpp:10:15: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] if ( n-2 & (1ll<<bit) ) ^ user.cpp:5:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("inversmodular.in","r",stdin); ^ user.cpp:6:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("inversmodular.out","w",stdout); ^ user.cpp:8:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%lld%lld" , &a,&n ); ^