Compilare: user.cpp: In function ‘int main()’: user.cpp:53:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (q.size() < cur && !level[i].empty()) ^ user.cpp:20:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lupu.in", "r", stdin); ^ user.cpp:21:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lupu.out", "w", stdout); ^ user.cpp:24:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &n, &lmax, &l); ^ user.cpp:26:55: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &lamb[i].first, &lamb[i].second); ^