Compilare: user.cpp: In function ‘int main()’: user.cpp:15:40: warning: suggest parentheses around ‘-’ inside ‘>>’ [-Wparentheses] printf("%lld\n", ((N * lim - sum - ((lim >> 1) + (lim & 1)) >> 1)) - (sum - lim)); ^ user.cpp:5:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("oluna.in", "r", stdin); ^ user.cpp:6:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("oluna.out", "w", stdout); ^ user.cpp:8:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(scanf("%lld", &T); T; -- T) { ^ user.cpp:9:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &N); ^