Compilare: user.cpp: In function ‘void solve_batch()’: user.cpp:56:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 2; i < now.size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:95:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("testament.in","r",stdin); ^ user.cpp:96:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("testament.out","w",stdout); ^ user.cpp:98:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &need, &n); ^ user.cpp:102:62: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %lld", &Point[i].first, &Point[i].second); ^