Compilare: user.cpp: In function ‘void solve(long long int, long long int, int, std::vector<long long int>&, std::vector<long long int>&, std::vector<long long int>&)’: user.cpp:58:32: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] while ((a & power_of2[index] == b & power_of2[index])) { ^ user.cpp:59:65: warning: operation on ‘index’ may be undefined [-Wsequence-point] base_cost += cost[index] * ((a & power_of2[index --]) * 1ll); ^