Compilare: main.cpp: In function 'int main()': main.cpp:56:31: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] if (cfg[i-1] & it != cfg[i-1]) continue; ~~~^~~~~~~~~~~ main.cpp:28:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pavare.in","r",stdin); ^ main.cpp:29:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pavare.out","w",stdout); ^