Compilare: user.cpp: In function ‘int main()’: user.cpp:19:33: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] long long mid = 1LL << n-2; ^ user.cpp:11:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("semipal.in", "r", stdin); ^ user.cpp:12:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("semipal.out", "w", stdout); ^