Compilare: user.cpp: In function ‘void Insert(ll)’: user.cpp:18:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Hash[n].size(); i++){ ^ user.cpp: In function ‘int Find(ll)’: user.cpp:36:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Hash[n].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:56:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("abc2.in", "r", stdin); ^ user.cpp:57:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("abc2.out", "w", stdout); ^