Compilare: user.cpp: In function ‘bool ok(int, int, int)’: user.cpp:20:42: warning: suggest parentheses around comparison in operand of ‘^’ [-Wparentheses] if((a % (1 << s)) xor (b % (1 << s)) == (1<<s) - 1 ) ^ user.cpp: In function ‘int bfs()’: user.cpp:78:1: warning: control reaches end of non-void function [-Wreturn-type] } ^