Compilare: user.cpp: In function ‘void bs(int, int, std::vector<query>)’: user.cpp:98:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<queries.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:155:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("luff.in","r",stdin); ^ user.cpp:156:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("luff.out","w",stdout); ^ user.cpp:160:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&q); ^ user.cpp:165:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&d); ^ user.cpp:181:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&d); ^