Compilare: user.cpp: In function ‘int main()’: user.cpp:18:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i <= N; i++) ^ user.cpp:21:59: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (!pos.empty() && (i - pos.front() > T)) ^ user.cpp:13:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("branza.in","r",stdin); ^ user.cpp:14:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("branza.out","w",stdout); ^ user.cpp:16:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &N, &S, &T); ^ user.cpp:20:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld", &X, &Y); ^