Compilare: user.cpp: In function ‘int findH(unsigned int)’: user.cpp:20:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < H[r].size (); i++) { ^ user.cpp:21:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (H[r][i].first == Q) { ^ user.cpp: In function ‘int main()’: user.cpp:40:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("oite.in", "r", stdin); ^ user.cpp:41:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("oite.out", "w", stdout); ^ user.cpp:43:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%u%u", &N, &S); ^ user.cpp:45:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%u", &v[i]); ^