Compilare: user.cpp: In function ‘void add(unsigned int)’: user.cpp:26:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < h[ind].size () && !OK; ++i) ^ user.cpp: In function ‘void del(unsigned int)’: user.cpp:35:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < h[ind].size (); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:71:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("secv5.in", "r", stdin); ^ user.cpp:72:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("secv5.out", "w", stdout); ^ user.cpp:74:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d %d", &n, &l, &u); ^ user.cpp:77:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%u", &v[i]); ^