Compilare: user.cpp: In function ‘i64 gcd(i64, i64)’: user.cpp:15:6: warning: unused variable ‘t’ [-Wunused-variable] i64 t; ^ user.cpp: In function ‘void bkt(int, int, i64)’: user.cpp:28:45: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] ant+= (taken % 2 ? 1 : -1) * (1 << taken - 1) * (n / lcm_now); // an incredible case of a good overflow ~~~~~~^~~