Compilare: user.cpp: In function ‘int main()’: user.cpp:23:27: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if ((z>>(j-1))&1!=0) ^ user.cpp:10:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("flip.in","r",stdin); ^ user.cpp:11:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("flip.out","w",stdout); ^