Compilare: user.cpp: In function ‘bool OK(int, int, int)’: user.cpp:17:18: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if(!(fr&(1<<s-1))==(sec&(1<<s-1))) ^ user.cpp:17:34: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] if(!(fr&(1<<s-1))==(sec&(1<<s-1))) ^ user.cpp:17:22: warning: logical not is only applied to the left hand side of comparison [-Wlogical-not-parentheses] if(!(fr&(1<<s-1))==(sec&(1<<s-1))) ^