Compilare: user.cpp: In member function ‘bool Hash::search(int, int&)’: user.cpp:36:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < lists[indice].size(); ++i) ~~^~~~~~~~~~~~~~~~~~~~~~ user.cpp: In member function ‘bool Hash::search(int)’: user.cpp:47:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < lists[indice].size(); ++i) ~~^~~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:87:9: warning: unused variable ‘maximum’ [-Wunused-variable] int maximum = 0; ^~~~~~~ user.cpp:85:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("elmaj.in", "r", stdin); ^ user.cpp:86:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("elmaj.out", "w", stdout); ^ user.cpp:88:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:92:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a); ^